diff options
Diffstat (limited to 'src')
18 files changed, 1848 insertions, 394 deletions
diff --git a/src/drivers/hil/hil.cpp b/src/drivers/hil/hil.cpp index f17e99e9d..f0dc0c651 100644 --- a/src/drivers/hil/hil.cpp +++ b/src/drivers/hil/hil.cpp @@ -392,7 +392,8 @@ HIL::task_main() if (fds[0].revents & POLLIN) { /* get controls - must always do this to avoid spinning */ - orb_copy(ORB_ID_VEHICLE_ATTITUDE_CONTROLS, _t_actuators, &_controls); + orb_copy(_primary_pwm_device ? ORB_ID_VEHICLE_ATTITUDE_CONTROLS : + ORB_ID(actuator_controls_1), _t_actuators, &_controls); /* can we mix? */ if (_mixers != nullptr) { diff --git a/src/lib/external_lgpl/tecs/tecs.cpp b/src/lib/external_lgpl/tecs/tecs.cpp index d27bf776f..da99aa5b1 100644 --- a/src/lib/external_lgpl/tecs/tecs.cpp +++ b/src/lib/external_lgpl/tecs/tecs.cpp @@ -236,9 +236,8 @@ void TECS::_update_height_demand(float demand, float state) // // _hgt_rate_dem); _hgt_dem_adj = demand;//0.025f * demand + 0.975f * _hgt_dem_adj_last; + _hgt_rate_dem = (_hgt_dem_adj-state)*_heightrate_p + _heightrate_ff * (_hgt_dem_adj - _hgt_dem_adj_last)/_DT; _hgt_dem_adj_last = _hgt_dem_adj; - - _hgt_rate_dem = (_hgt_dem_adj-state)*_heightrate_p; // Limit height rate of change if (_hgt_rate_dem > _maxClimbRate) { _hgt_rate_dem = _maxClimbRate; diff --git a/src/lib/external_lgpl/tecs/tecs.h b/src/lib/external_lgpl/tecs/tecs.h index 36ae4ecaf..8ac31de6f 100644 --- a/src/lib/external_lgpl/tecs/tecs.h +++ b/src/lib/external_lgpl/tecs/tecs.h @@ -47,6 +47,7 @@ public: _rollComp(0.0f), _spdWeight(0.5f), _heightrate_p(0.0f), + _heightrate_ff(0.0f), _speedrate_p(0.0f), _throttle_dem(0.0f), _pitch_dem(0.0f), @@ -220,6 +221,10 @@ public: _heightrate_p = heightrate_p; } + void set_heightrate_ff(float heightrate_ff) { + _heightrate_ff = heightrate_ff; + } + void set_speedrate_p(float speedrate_p) { _speedrate_p = speedrate_p; } @@ -256,6 +261,7 @@ private: float _rollComp; float _spdWeight; float _heightrate_p; + float _heightrate_ff; float _speedrate_p; // throttle demand in the range from 0.0 to 1.0 diff --git a/src/modules/bottle_drop/bottle_drop.cpp b/src/modules/bottle_drop/bottle_drop.cpp new file mode 100644 index 000000000..0bb65252f --- /dev/null +++ b/src/modules/bottle_drop/bottle_drop.cpp @@ -0,0 +1,899 @@ +/**************************************************************************** + * + * Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name PX4 nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/** + * @file bottle_drop.cpp + * + * Bottle drop module for Outback Challenge 2014, Team Swiss Fang + * + * @author Dominik Juchli <juchlid@ethz.ch> + * @author Julian Oes <joes@student.ethz.ch> + */ + +#include <nuttx/config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include <math.h> +#include <poll.h> +#include <time.h> +#include <sys/ioctl.h> +#include <drivers/device/device.h> +#include <drivers/drv_hrt.h> +#include <arch/board/board.h> +#include <uORB/uORB.h> +#include <uORB/topics/vehicle_command.h> +#include <uORB/topics/actuator_controls.h> +#include <uORB/topics/wind_estimate.h> +#include <uORB/topics/parameter_update.h> +#include <systemlib/systemlib.h> +#include <systemlib/param/param.h> +#include <systemlib/err.h> +#include <geo/geo.h> +#include <dataman/dataman.h> +#include <mathlib/mathlib.h> +#include <mavlink/mavlink_log.h> + + +/** + * bottle_drop app start / stop handling function + * + * @ingroup apps + */ +extern "C" __EXPORT int bottle_drop_main(int argc, char *argv[]); + +class BottleDrop +{ +public: + /** + * Constructor + */ + BottleDrop(); + + /** + * Destructor, also kills task. + */ + ~BottleDrop(); + + /** + * Start the task. + * + * @return OK on success. + */ + int start(); + + /** + * Display status. + */ + void status(); + + void open_bay(); + void close_bay(); + void drop(); + void lock_release(); + +private: + bool _task_should_exit; /**< if true, task should exit */ + int _main_task; /**< handle for task */ + int _mavlink_fd; + + int _command_sub; + int _wind_estimate_sub; + struct vehicle_command_s _command; + struct vehicle_global_position_s _global_pos; + map_projection_reference_s ref; + + orb_advert_t _actuator_pub; + struct actuator_controls_s _actuators; + + bool _drop_approval; + hrt_abstime _doors_opened; + hrt_abstime _drop_time; + + float _alt_clearance; + + struct position_s { + double lat; ///< degrees + double lon; ///< degrees + float alt; ///< m + } _target_position, _drop_position; + + enum DROP_STATE { + DROP_STATE_INIT = 0, + DROP_STATE_TARGET_VALID, + DROP_STATE_TARGET_SET, + DROP_STATE_BAY_OPEN, + DROP_STATE_DROPPED, + DROP_STATE_BAY_CLOSED + } _drop_state; + + struct mission_s _onboard_mission; + orb_advert_t _onboard_mission_pub; + + void task_main(); + + void handle_command(struct vehicle_command_s *cmd); + + void answer_command(struct vehicle_command_s *cmd, enum VEHICLE_CMD_RESULT result); + + /** + * Set the actuators + */ + int actuators_publish(); + + /** + * Shim for calling task_main from task_create. + */ + static void task_main_trampoline(int argc, char *argv[]); +}; + +namespace bottle_drop +{ +BottleDrop *g_bottle_drop; +} + +BottleDrop::BottleDrop() : + + _task_should_exit(false), + _main_task(-1), + _mavlink_fd(-1), + _command_sub(-1), + _wind_estimate_sub(-1), + _command {}, + _global_pos {}, + ref {}, + _actuator_pub(-1), + _actuators {}, + _drop_approval(false), + _doors_opened(0), + _drop_time(0), + _alt_clearance(70.0f), + _target_position {}, + _drop_position {}, + _drop_state(DROP_STATE_INIT), + _onboard_mission {}, + _onboard_mission_pub(-1) +{ +} + +BottleDrop::~BottleDrop() +{ + if (_main_task != -1) { + + /* task wakes up every 100ms or so at the longest */ + _task_should_exit = true; + + /* wait for a second for the task to quit at our request */ + unsigned i = 0; + + do { + /* wait 20ms */ + usleep(20000); + + /* if we have given up, kill it */ + if (++i > 50) { + task_delete(_main_task); + break; + } + } while (_main_task != -1); + } + + bottle_drop::g_bottle_drop = nullptr; +} + +int +BottleDrop::start() +{ + ASSERT(_main_task == -1); + + /* start the task */ + _main_task = task_spawn_cmd("bottle_drop", + SCHED_DEFAULT, + SCHED_PRIORITY_MAX - 5, + 2048, + (main_t)&BottleDrop::task_main_trampoline, + nullptr); + + if (_main_task < 0) { + warn("task start failed"); + return -errno; + } + + return OK; +} + + +void +BottleDrop::status() +{ + warnx("drop state: %d", _drop_state); +} + +void +BottleDrop::open_bay() +{ + _actuators.control[0] = -1.0f; + _actuators.control[1] = 1.0f; + + if (_doors_opened == 0) { + _doors_opened = hrt_absolute_time(); + } + warnx("open doors"); + + actuators_publish(); + + usleep(500 * 1000); +} + +void +BottleDrop::close_bay() +{ + // closed door and locked survival kit + _actuators.control[0] = 1.0f; + _actuators.control[1] = -1.0f; + + _doors_opened = 0; + + actuators_publish(); + + // delay until the bay is closed + usleep(500 * 1000); +} + +void +BottleDrop::drop() +{ + + // update drop actuator, wait 0.5s until the doors are open before dropping + hrt_abstime starttime = hrt_absolute_time(); + + // force the door open if we have to + if (_doors_opened == 0) { + open_bay(); + warnx("bay not ready, forced open"); + } + + while (hrt_elapsed_time(&_doors_opened) < 500 * 1000 && hrt_elapsed_time(&starttime) < 2000000) { + usleep(50000); + warnx("delayed by door!"); + } + + _actuators.control[2] = 1.0f; + + _drop_time = hrt_absolute_time(); + actuators_publish(); + + warnx("dropping now"); + + // Give it time to drop + usleep(1000 * 1000); +} + +void +BottleDrop::lock_release() +{ + _actuators.control[2] = -1.0f; + actuators_publish(); + + warnx("closing release"); +} + +int +BottleDrop::actuators_publish() +{ + _actuators.timestamp = hrt_absolute_time(); + + // lazily publish _actuators only once available + if (_actuator_pub > 0) { + return orb_publish(ORB_ID(actuator_controls_2), _actuator_pub, &_actuators); + + } else { + _actuator_pub = orb_advertise(ORB_ID(actuator_controls_2), &_actuators); + if (_actuator_pub > 0) { + return OK; + } else { + return -1; + } + } +} + +void +BottleDrop::task_main() +{ + + _mavlink_fd = open(MAVLINK_LOG_DEVICE, 0); + mavlink_log_info(_mavlink_fd, "[bottle_drop] started"); + + _command_sub = orb_subscribe(ORB_ID(vehicle_command)); + _wind_estimate_sub = orb_subscribe(ORB_ID(wind_estimate)); + + bool updated = false; + + float z_0; // ground properties + float turn_radius; // turn radius of the UAV + float precision; // Expected precision of the UAV + + float ground_distance = _alt_clearance; // Replace by closer estimate in loop + + // constant + float g = CONSTANTS_ONE_G; // constant of gravity [m/s^2] + float m = 0.5f; // mass of bottle [kg] + float rho = 1.2f; // air density [kg/m^3] + float A = ((0.063f * 0.063f) / 4.0f * M_PI_F); // Bottle cross section [m^2] + float dt_freefall_prediction = 0.01f; // step size of the free fall prediction [s] + + // Has to be estimated by experiment + float cd = 0.86f; // Drag coefficient for a cylinder with a d/l ratio of 1/3 [] + float t_signal = + 0.084f; // Time span between sending the signal and the bottle top reaching level height with the bottom of the plane [s] + float t_door = + 0.7f; // The time the system needs to open the door + safety, is also the time the palyload needs to safely escape the shaft [s] + + + // Definition + float h_0; // height over target + float az; // acceleration in z direction[m/s^2] + float vz; // velocity in z direction [m/s] + float z; // fallen distance [m] + float h; // height over target [m] + float ax; // acceleration in x direction [m/s^2] + float vx; // ground speed in x direction [m/s] + float x; // traveled distance in x direction [m] + float vw; // wind speed [m/s] + float vrx; // relative velocity in x direction [m/s] + float v; // relative speed vector [m/s] + float Fd; // Drag force [N] + float Fdx; // Drag force in x direction [N] + float Fdz; // Drag force in z direction [N] + float x_drop, y_drop; // coordinates of the drop point in reference to the target (projection of NED) + float x_t, y_t; // coordinates of the target in reference to the target x_t = 0, y_t = 0 (projection of NED) + float x_l, y_l; // local position in projected coordinates + float x_f, y_f; // to-be position of the UAV after dt_runs seconds in projected coordinates + double x_f_NED, y_f_NED; // to-be position of the UAV after dt_runs seconds in NED + float distance_open_door; // The distance the UAV travels during its doors open [m] + float distance_real = 0; // The distance between the UAVs position and the drop point [m] + float future_distance = 0; // The distance between the UAVs to-be position and the drop point [m] + + unsigned counter = 0; + + param_t param_gproperties = param_find("BD_GPROPERTIES"); + param_t param_turn_radius = param_find("BD_TURNRADIUS"); + param_t param_precision = param_find("BD_PRECISION"); + param_t param_cd = param_find("BD_OBJ_CD"); + param_t param_mass = param_find("BD_OBJ_MASS"); + param_t param_surface = param_find("BD_OBJ_SURFACE"); + + + param_get(param_precision, &precision); + param_get(param_turn_radius, &turn_radius); + param_get(param_gproperties, &z_0); + param_get(param_cd, &cd); + param_get(param_mass, &m); + param_get(param_surface, &A); + + int vehicle_global_position_sub = orb_subscribe(ORB_ID(vehicle_global_position)); + + struct parameter_update_s update; + memset(&update, 0, sizeof(update)); + int parameter_update_sub = orb_subscribe(ORB_ID(parameter_update)); + + struct mission_item_s flight_vector_s {}; + struct mission_item_s flight_vector_e {}; + + flight_vector_s.nav_cmd = NAV_CMD_WAYPOINT; + flight_vector_s.acceptance_radius = 50; // TODO: make parameter + flight_vector_s.autocontinue = true; + flight_vector_s.altitude_is_relative = false; + + flight_vector_e.nav_cmd = NAV_CMD_WAYPOINT; + flight_vector_e.acceptance_radius = 50; // TODO: make parameter + flight_vector_e.autocontinue = true; + flight_vector_s.altitude_is_relative = false; + + struct wind_estimate_s wind; + + // wakeup source(s) + struct pollfd fds[1]; + + // Setup of loop + fds[0].fd = _command_sub; + fds[0].events = POLLIN; + + // Whatever state the bay is in, we want it closed on startup + lock_release(); + close_bay(); + + while (!_task_should_exit) { + + /* wait for up to 100ms for data */ + int pret = poll(&fds[0], (sizeof(fds) / sizeof(fds[0])), 50); + + /* this is undesirable but not much we can do - might want to flag unhappy status */ + if (pret < 0) { + warn("poll error %d, %d", pret, errno); + continue; + } + + /* vehicle commands updated */ + if (fds[0].revents & POLLIN) { + orb_copy(ORB_ID(vehicle_command), _command_sub, &_command); + handle_command(&_command); + } + + orb_check(vehicle_global_position_sub, &updated); + if (updated) { + /* copy global position */ + orb_copy(ORB_ID(vehicle_global_position), vehicle_global_position_sub, &_global_pos); + } + + if (_global_pos.timestamp == 0) { + continue; + } + + const unsigned sleeptime_us = 50000; + + hrt_abstime last_run = hrt_absolute_time(); + float dt_runs = 1e6f / sleeptime_us; + + // switch to faster updates during the drop + while (_drop_state > DROP_STATE_INIT) { + + // Get wind estimate + orb_check(_wind_estimate_sub, &updated); + if (updated) { + orb_copy(ORB_ID(wind_estimate), _wind_estimate_sub, &wind); + } + + // Get vehicle position + orb_check(vehicle_global_position_sub, &updated); + if (updated) { + // copy global position + orb_copy(ORB_ID(vehicle_global_position), vehicle_global_position_sub, &_global_pos); + } + + // Get parameter updates + orb_check(parameter_update_sub, &updated); + if (updated) { + // copy global position + orb_copy(ORB_ID(parameter_update), parameter_update_sub, &update); + + // update all parameters + param_get(param_gproperties, &z_0); + param_get(param_turn_radius, &turn_radius); + param_get(param_precision, &precision); + } + + orb_check(_command_sub, &updated); + if (updated) { + orb_copy(ORB_ID(vehicle_command), _command_sub, &_command); + handle_command(&_command); + } + + + float windspeed_norm = sqrtf(wind.windspeed_north * wind.windspeed_north + wind.windspeed_east * wind.windspeed_east); + float groundspeed_body = sqrtf(_global_pos.vel_n * _global_pos.vel_n + _global_pos.vel_e * _global_pos.vel_e); + distance_real = fabsf(get_distance_to_next_waypoint(_global_pos.lat, _global_pos.lon, _drop_position.lat, _drop_position.lon)); + ground_distance = _global_pos.alt - _target_position.alt; + + if (counter % 90 == 0) { + mavlink_log_info(_mavlink_fd, "#audio: drop distance %.2f", (double)distance_real); + } + + switch (_drop_state) { + + case DROP_STATE_TARGET_VALID: + { + + // Update drop point at 10 Hz + if (counter % 10 == 0) { + + az = g; // acceleration in z direction[m/s^2] + vz = 0; // velocity in z direction [m/s] + z = 0; // fallen distance [m] + h_0 = _global_pos.alt - _target_position.alt; // height over target at start[m] + h = h_0; // height over target [m] + ax = 0; // acceleration in x direction [m/s^2] + vx = groundspeed_body;// XXX project // ground speed in x direction [m/s] + x = 0; // traveled distance in x direction [m] + vw = 0; // wind speed [m/s] + vrx = 0; // relative velocity in x direction [m/s] + v = groundspeed_body; // relative speed vector [m/s] + Fd = 0; // Drag force [N] + Fdx = 0; // Drag force in x direction [N] + Fdz = 0; // Drag force in z direction [N] + + + // Compute the distance the bottle will travel after it is dropped in body frame coordinates --> x + while (h > 0.05f) { + // z-direction + vz = vz + az * dt_freefall_prediction; + z = z + vz * dt_freefall_prediction; + h = h_0 - z; + + // x-direction + vw = windspeed_norm * logf(h / z_0) / logf(ground_distance / z_0); + vx = vx + ax * dt_freefall_prediction; + x = x + vx * dt_freefall_prediction; + vrx = vx + vw; + + // drag force + v = sqrtf(vz * vz + vrx * vrx); + Fd = 0.5f * rho * A * cd * (v * v); + Fdx = Fd * vrx / v; + Fdz = Fd * vz / v; + + // acceleration + az = g - Fdz / m; + ax = -Fdx / m; + } + + // compute drop vector + x = groundspeed_body * t_signal + x; + } + + x_t = 0.0f; + y_t = 0.0f; + + float wind_direction_n, wind_direction_e; + + if (windspeed_norm < 0.5f) { // If there is no wind, an arbitrarily direction is chosen + wind_direction_n = 1.0f; + wind_direction_e = 0.0f; + + } else { + wind_direction_n = wind.windspeed_north / windspeed_norm; + wind_direction_e = wind.windspeed_east / windspeed_norm; + } + + x_drop = x_t + x * wind_direction_n; + y_drop = y_t + x * wind_direction_e; + map_projection_reproject(&ref, x_drop, y_drop, &_drop_position.lat, &_drop_position.lon); + _drop_position.alt = _target_position.alt + _alt_clearance; + + // Compute flight vector + map_projection_reproject(&ref, x_drop + 2 * turn_radius * wind_direction_n, y_drop + 2 * turn_radius * wind_direction_e, + &(flight_vector_s.lat), &(flight_vector_s.lon)); + flight_vector_s.altitude = _drop_position.alt; + map_projection_reproject(&ref, x_drop - turn_radius * wind_direction_n, y_drop - turn_radius * wind_direction_e, + &flight_vector_e.lat, &flight_vector_e.lon); + flight_vector_e.altitude = _drop_position.alt; + + // Save WPs in datamanager + const ssize_t len = sizeof(struct mission_item_s); + + if (dm_write(DM_KEY_WAYPOINTS_ONBOARD, 0, DM_PERSIST_IN_FLIGHT_RESET, &flight_vector_s, len) != len) { + warnx("ERROR: could not save onboard WP"); + } + + if (dm_write(DM_KEY_WAYPOINTS_ONBOARD, 1, DM_PERSIST_IN_FLIGHT_RESET, &flight_vector_e, len) != len) { + warnx("ERROR: could not save onboard WP"); + } + + _onboard_mission.count = 2; + _onboard_mission.current_seq = 0; + + if (_onboard_mission_pub > 0) { + orb_publish(ORB_ID(onboard_mission), _onboard_mission_pub, &_onboard_mission); + + } else { + _onboard_mission_pub = orb_advertise(ORB_ID(onboard_mission), &_onboard_mission); + } + + _drop_state = DROP_STATE_TARGET_SET; + } + break; + + case DROP_STATE_TARGET_SET: + { + float distance_wp2 = get_distance_to_next_waypoint(_global_pos.lat, _global_pos.lon, flight_vector_e.lat, flight_vector_e.lon); + + if (distance_wp2 < distance_real) { + _onboard_mission.current_seq = 0; + orb_publish(ORB_ID(onboard_mission), _onboard_mission_pub, &_onboard_mission); + } else { + + // We're close enough - open the bay + distance_open_door = math::max(5.0f, 3.0f * fabsf(t_door * groundspeed_body)); + + if (isfinite(distance_real) && distance_real < distance_open_door) { + open_bay(); + _drop_state = DROP_STATE_BAY_OPEN; + mavlink_log_info(_mavlink_fd, "#audio: opening bay"); + } + } + } + break; + + case DROP_STATE_BAY_OPEN: + { + if (_drop_approval) { + map_projection_project(&ref, _global_pos.lat, _global_pos.lon, &x_l, &y_l); + x_f = x_l + _global_pos.vel_n * dt_runs; + y_f = y_l + _global_pos.vel_e * dt_runs; + map_projection_reproject(&ref, x_f, y_f, &x_f_NED, &y_f_NED); + future_distance = get_distance_to_next_waypoint(x_f_NED, y_f_NED, _drop_position.lat, _drop_position.lon); + + warnx("Distance real: %.2f", (double)distance_real); + + if (isfinite(distance_real) && + (distance_real < precision) && ((distance_real < future_distance) || + (distance_real < precision / 10.0f))) { + drop(); + _drop_state = DROP_STATE_DROPPED; + mavlink_log_info(_mavlink_fd, "#audio: payload dropped"); + } else { + + float distance_wp2 = get_distance_to_next_waypoint(_global_pos.lat, _global_pos.lon, flight_vector_e.lat, flight_vector_e.lon); + + if (distance_wp2 < distance_real) { + _onboard_mission.current_seq = 0; + orb_publish(ORB_ID(onboard_mission), _onboard_mission_pub, &_onboard_mission); + } + } + } + } + break; + + case DROP_STATE_DROPPED: + /* 2s after drop, reset and close everything again */ + if ((hrt_elapsed_time(&_doors_opened) > 2 * 1000 * 1000)) { + _drop_state = DROP_STATE_INIT; + _drop_approval = false; + lock_release(); + close_bay(); + mavlink_log_info(_mavlink_fd, "#audio: closing bay"); + + // remove onboard mission + _onboard_mission.current_seq = -1; + _onboard_mission.count = 0; + orb_publish(ORB_ID(onboard_mission), _onboard_mission_pub, &_onboard_mission); + } + break; + } + + counter++; + + // update_actuators(); + + // run at roughly 20 Hz + usleep(sleeptime_us); + + dt_runs = 1e6f / hrt_elapsed_time(&last_run); + last_run = hrt_absolute_time(); + } + } + + warnx("exiting."); + + _main_task = -1; + _exit(0); +} + +void +BottleDrop::handle_command(struct vehicle_command_s *cmd) +{ + switch (cmd->command) { + case VEHICLE_CMD_CUSTOM_0: + /* + * param1 and param2 set to 1: open and drop + * param1 set to 1: open + * else: close (and don't drop) + */ + if (cmd->param1 > 0.5f && cmd->param2 > 0.5f) { + open_bay(); + drop(); + mavlink_log_info(_mavlink_fd, "#audio: drop bottle"); + + } else if (cmd->param1 > 0.5f) { + open_bay(); + mavlink_log_info(_mavlink_fd, "#audio: opening bay"); + + } else { + lock_release(); + close_bay(); + mavlink_log_info(_mavlink_fd, "#audio: closing bay"); + } + + answer_command(cmd, VEHICLE_CMD_RESULT_ACCEPTED); + break; + + case VEHICLE_CMD_PAYLOAD_PREPARE_DEPLOY: + + switch ((int)(cmd->param1 + 0.5f)) { + case 0: + _drop_approval = false; + mavlink_log_info(_mavlink_fd, "#audio: got drop position, no approval"); + break; + + case 1: + _drop_approval = true; + mavlink_log_info(_mavlink_fd, "#audio: got drop position and approval"); + break; + + default: + _drop_approval = false; + warnx("param1 val unknown"); + break; + } + + // XXX check all fields (2-3) + _alt_clearance = cmd->param4; + _target_position.lat = cmd->param5; + _target_position.lon = cmd->param6; + _target_position.alt = cmd->param7; + _drop_state = DROP_STATE_TARGET_VALID; + mavlink_log_info(_mavlink_fd, "got target: %8.4f, %8.4f, %8.4f", (double)_target_position.lat, + (double)_target_position.lon, (double)_target_position.alt); + map_projection_init(&ref, _target_position.lat, _target_position.lon); + answer_command(cmd, VEHICLE_CMD_RESULT_ACCEPTED); + break; + + case VEHICLE_CMD_PAYLOAD_CONTROL_DEPLOY: + + if (cmd->param1 < 0) { + + // Clear internal states + _drop_approval = false; + _drop_state = DROP_STATE_INIT; + + // Abort if mission is present + _onboard_mission.current_seq = -1; + + if (_onboard_mission_pub > 0) { + orb_publish(ORB_ID(onboard_mission), _onboard_mission_pub, &_onboard_mission); + } + + } else { + switch ((int)(cmd->param1 + 0.5f)) { + case 0: + _drop_approval = false; + break; + + case 1: + _drop_approval = true; + mavlink_log_info(_mavlink_fd, "#audio: got drop approval"); + break; + + default: + _drop_approval = false; + break; + // XXX handle other values + } + } + + answer_command(cmd, VEHICLE_CMD_RESULT_ACCEPTED); + break; + + default: + break; + } +} + +void +BottleDrop::answer_command(struct vehicle_command_s *cmd, enum VEHICLE_CMD_RESULT result) +{ + switch (result) { + case VEHICLE_CMD_RESULT_ACCEPTED: + break; + + case VEHICLE_CMD_RESULT_DENIED: + mavlink_log_critical(_mavlink_fd, "#audio: command denied: %u", cmd->command); + break; + + case VEHICLE_CMD_RESULT_FAILED: + mavlink_log_critical(_mavlink_fd, "#audio: command failed: %u", cmd->command); + break; + + case VEHICLE_CMD_RESULT_TEMPORARILY_REJECTED: + mavlink_log_critical(_mavlink_fd, "#audio: command temporarily rejected: %u", cmd->command); + break; + + case VEHICLE_CMD_RESULT_UNSUPPORTED: + mavlink_log_critical(_mavlink_fd, "#audio: command unsupported: %u", cmd->command); + break; + + default: + break; + } +} + +void +BottleDrop::task_main_trampoline(int argc, char *argv[]) +{ + bottle_drop::g_bottle_drop->task_main(); +} + +static void usage() +{ + errx(1, "usage: bottle_drop {start|stop|status}"); +} + +int bottle_drop_main(int argc, char *argv[]) +{ + if (argc < 2) { + usage(); + } + + if (!strcmp(argv[1], "start")) { + + if (bottle_drop::g_bottle_drop != nullptr) { + errx(1, "already running"); + } + + bottle_drop::g_bottle_drop = new BottleDrop; + + if (bottle_drop::g_bottle_drop == nullptr) { + errx(1, "alloc failed"); + } + + if (OK != bottle_drop::g_bottle_drop->start()) { + delete bottle_drop::g_bottle_drop; + bottle_drop::g_bottle_drop = nullptr; + err(1, "start failed"); + } + + return 0; + } + + if (bottle_drop::g_bottle_drop == nullptr) { + errx(1, "not running"); + } + + if (!strcmp(argv[1], "stop")) { + delete bottle_drop::g_bottle_drop; + bottle_drop::g_bottle_drop = nullptr; + + } else if (!strcmp(argv[1], "status")) { + bottle_drop::g_bottle_drop->status(); + + } else if (!strcmp(argv[1], "drop")) { + bottle_drop::g_bottle_drop->drop(); + + } else if (!strcmp(argv[1], "open")) { + bottle_drop::g_bottle_drop->open_bay(); + + } else if (!strcmp(argv[1], "close")) { + bottle_drop::g_bottle_drop->close_bay(); + + } else if (!strcmp(argv[1], "lock")) { + bottle_drop::g_bottle_drop->lock_release(); + + } else { + usage(); + } + + return 0; +} diff --git a/src/modules/bottle_drop/bottle_drop_params.c b/src/modules/bottle_drop/bottle_drop_params.c new file mode 100644 index 000000000..e5d35bf0a --- /dev/null +++ b/src/modules/bottle_drop/bottle_drop_params.c @@ -0,0 +1,131 @@ +/**************************************************************************** + * + * Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name PX4 nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/** + * @file bottle_drop_params.c + * Bottle drop parameters + * + * @author Dominik Juchli <juchlid@ethz.ch> + */ + +#include <nuttx/config.h> +#include <systemlib/param/param.h> + +/** + * Ground drag property + * + * This parameter encodes the ground drag coefficient and the corresponding + * decrease in wind speed from the plane altitude to ground altitude. + * + * @unit unknown + * @min 0.001 + * @max 0.1 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_GPROPERTIES, 0.03f); + +/** + * Plane turn radius + * + * The planes known minimal turn radius - use a higher value + * to make the plane maneuver more distant from the actual drop + * position. This is to ensure the wings are level during the drop. + * + * @unit meter + * @min 30.0 + * @max 500.0 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_TURNRADIUS, 120.0f); + +/** + * Drop precision + * + * If the system is closer than this distance on passing over the + * drop position, it will release the payload. This is a safeguard + * to prevent a drop out of the required accuracy. + * + * @unit meter + * @min 1.0 + * @max 80.0 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_PRECISION, 30.0f); + +/** + * Payload drag coefficient of the dropped object + * + * The drag coefficient (cd) is the typical drag + * constant for air. It is in general object specific, + * but the closest primitive shape to the actual object + * should give good results: + * http://en.wikipedia.org/wiki/Drag_coefficient + * + * @unit meter + * @min 1.0 + * @max 80.0 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_OBJ_CD, 0.86f); + +/** + * Payload mass + * + * A typical small toy ball: + * 0.025 kg + * + * OBC water bottle: + * 0.6 kg + * + * @unit kilogram + * @min 0.001 + * @max 5.0 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_OBJ_MASS, 0.6f); + +/** + * Payload front surface area + * + * A typical small toy ball: + * (0.045 * 0.045) / 4.0 * pi = 0.001590 m^2 + * + * OBC water bottle: + * (0.063 * 0.063) / 4.0 * pi = 0.003117 m^2 + * + * @unit m^2 + * @min 0.001 + * @max 0.5 + * @group Payload drop + */ +PARAM_DEFINE_FLOAT(BD_OBJ_SURFACE, 0.00311724531f); diff --git a/src/modules/bottle_drop/module.mk b/src/modules/bottle_drop/module.mk new file mode 100644 index 000000000..6b18fff55 --- /dev/null +++ b/src/modules/bottle_drop/module.mk @@ -0,0 +1,41 @@ +############################################################################ +# +# Copyright (c) 2013, 2014 PX4 Development Team. All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# +# 1. Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in +# the documentation and/or other materials provided with the +# distribution. +# 3. Neither the name PX4 nor the names of its contributors may be +# used to endorse or promote products derived from this software +# without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS +# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, +# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS +# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED +# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +# POSSIBILITY OF SUCH DAMAGE. +# +############################################################################ + +# +# Daemon application +# + +MODULE_COMMAND = bottle_drop + +SRCS = bottle_drop.cpp \ + bottle_drop_params.c diff --git a/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp b/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp index 91d17e787..97abb76a9 100644 --- a/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp +++ b/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp @@ -58,6 +58,7 @@ #include <drivers/drv_accel.h> #include <drivers/drv_mag.h> #include <drivers/drv_baro.h> +#include <drivers/drv_range_finder.h> #ifdef SENSOR_COMBINED_SUB #include <uORB/topics/sensor_combined.h> #endif @@ -96,7 +97,10 @@ extern "C" __EXPORT int ekf_att_pos_estimator_main(int argc, char *argv[]); __EXPORT uint32_t millis(); +__EXPORT uint64_t getMicros(); + static uint64_t IMUmsec = 0; +static uint64_t IMUusec = 0; static const uint64_t FILTER_INIT_DELAY = 1 * 1000 * 1000; uint32_t millis() @@ -104,6 +108,11 @@ uint32_t millis() return IMUmsec; } +uint64_t getMicros() +{ + return IMUusec; +} + class FixedwingEstimator { public: @@ -171,6 +180,7 @@ private: #else int _sensor_combined_sub; #endif + int _distance_sub; /**< distance measurement */ int _airspeed_sub; /**< airspeed subscription */ int _baro_sub; /**< barometer subscription */ int _gps_sub; /**< GPS subscription */ @@ -196,7 +206,8 @@ private: struct vehicle_global_position_s _global_pos; /**< global vehicle position */ struct vehicle_local_position_s _local_pos; /**< local vehicle position */ struct vehicle_gps_position_s _gps; /**< GPS position */ - struct wind_estimate_s _wind; /**< Wind estimate */ + struct wind_estimate_s _wind; /**< wind estimate */ + struct range_finder_report _distance; /**< distance estimate */ struct gyro_scale _gyro_offsets; struct accel_scale _accel_offsets; @@ -226,6 +237,7 @@ private: hrt_abstime _filter_start_time; hrt_abstime _last_sensor_timestamp; hrt_abstime _last_run; + hrt_abstime _distance_last_valid; bool _gyro_valid; bool _accel_valid; bool _mag_valid; @@ -342,6 +354,7 @@ FixedwingEstimator::FixedwingEstimator() : #else _sensor_combined_sub(-1), #endif + _distance_sub(-1), _airspeed_sub(-1), _baro_sub(-1), _gps_sub(-1), @@ -399,6 +412,7 @@ FixedwingEstimator::FixedwingEstimator() : _filter_start_time(0), _last_sensor_timestamp(0), _last_run(0), + _distance_last_valid(0), _gyro_valid(false), _accel_valid(false), _mag_valid(false), @@ -549,6 +563,7 @@ FixedwingEstimator::parameters_update() _ekf->gyroProcessNoise = _parameters.gyro_pnoise; _ekf->accelProcessNoise = _parameters.acc_pnoise; _ekf->airspeedMeasurementSigma = _parameters.eas_noise; + _ekf->rngFinderPitch = 0.0f; // XXX base on SENS_BOARD_Y_OFF } return OK; @@ -704,6 +719,7 @@ FixedwingEstimator::task_main() /* * do subscriptions */ + _distance_sub = orb_subscribe(ORB_ID(sensor_range_finder)); _baro_sub = orb_subscribe(ORB_ID(sensor_baro0)); _airspeed_sub = orb_subscribe(ORB_ID(airspeed)); _gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position)); @@ -753,6 +769,7 @@ FixedwingEstimator::task_main() bool newHgtData = false; bool newAdsData = false; bool newDataMag = false; + bool newRangeData = false; float posNED[3] = {0.0f, 0.0f, 0.0f}; // North, East Down position (m) @@ -850,7 +867,8 @@ FixedwingEstimator::task_main() } _last_sensor_timestamp = _gyro.timestamp; - IMUmsec = _gyro.timestamp / 1e3f; + IMUmsec = _gyro.timestamp / 1e3; + IMUusec = _gyro.timestamp; float deltaT = (_gyro.timestamp - _last_run) / 1e6f; _last_run = _gyro.timestamp; @@ -914,7 +932,8 @@ FixedwingEstimator::task_main() // Copy gyro and accel _last_sensor_timestamp = _sensor_combined.timestamp; - IMUmsec = _sensor_combined.timestamp / 1e3f; + IMUmsec = _sensor_combined.timestamp / 1e3; + IMUusec = _sensor_combined.timestamp; float deltaT = (_sensor_combined.timestamp - _last_run) / 1e6f; @@ -994,8 +1013,6 @@ FixedwingEstimator::task_main() if (gps_updated) { - last_gps = _gps.timestamp_position; - orb_copy(ORB_ID(vehicle_gps_position), _gps_sub, &_gps); perf_count(_perf_gps); @@ -1008,11 +1025,17 @@ FixedwingEstimator::task_main() _gps_start_time = hrt_absolute_time(); /* check if we had a GPS outage for a long time */ - if (hrt_elapsed_time(&last_gps) > 5 * 1000 * 1000) { + float gps_elapsed = hrt_elapsed_time(&last_gps) / 1e6f; + + const float pos_reset_threshold = 5.0f; // seconds + + /* timeout of 5 seconds */ + if (gps_elapsed > pos_reset_threshold) { _ekf->ResetPosition(); _ekf->ResetVelocity(); _ekf->ResetStoredStates(); } + _ekf->updateDtGpsFilt(math::constrain((_gps.timestamp_position - last_gps) / 1e6f, 0.01f, pos_reset_threshold)); /* fuse GPS updates */ @@ -1044,6 +1067,8 @@ FixedwingEstimator::task_main() newDataGps = true; + last_gps = _gps.timestamp_position; + } } @@ -1052,8 +1077,15 @@ FixedwingEstimator::task_main() orb_check(_baro_sub, &baro_updated); if (baro_updated) { + + hrt_abstime baro_last = _baro.timestamp; + orb_copy(ORB_ID(sensor_baro0), _baro_sub, &_baro); + float baro_elapsed = (_baro.timestamp - baro_last) / 1e6f; + + _ekf->updateDtHgtFilt(math::constrain(baro_elapsed, 0.001f, 0.1)); + _ekf->baroHgt = _baro.altitude; if (!_baro_init) { @@ -1114,6 +1146,19 @@ FixedwingEstimator::task_main() newDataMag = false; } + orb_check(_distance_sub, &newRangeData); + + if (newRangeData) { + orb_copy(ORB_ID(sensor_range_finder), _distance_sub, &_distance); + + if (_distance.valid) { + _ekf->rngMea = _distance.distance; + _distance_last_valid = _distance.timestamp; + } else { + newRangeData = false; + } + } + /* * CHECK IF ITS THE RIGHT TIME TO RUN THINGS ALREADY */ @@ -1197,6 +1242,7 @@ FixedwingEstimator::task_main() } else if (_ekf->statesInitialised) { // We're apparently initialized in this case now + // check (and reset the filter as needed) int check = check_filter_state(); if (check) { @@ -1206,21 +1252,7 @@ FixedwingEstimator::task_main() // Run the strapdown INS equations every IMU update _ekf->UpdateStrapdownEquationsNED(); - #if 0 - // debug code - could be tunred into a filter mnitoring/watchdog function - float tempQuat[4]; - - for (uint8_t j = 0; j <= 3; j++) tempQuat[j] = states[j]; - - quat2eul(eulerEst, tempQuat); - for (uint8_t j = 0; j <= 2; j++) eulerDif[j] = eulerEst[j] - ahrsEul[j]; - - if (eulerDif[2] > pi) eulerDif[2] -= 2 * pi; - - if (eulerDif[2] < -pi) eulerDif[2] += 2 * pi; - - #endif // store the predicted states for subsequent use by measurement fusion _ekf->StoreStates(IMUmsec); // Check if on ground - status is used by covariance prediction @@ -1334,6 +1366,13 @@ FixedwingEstimator::task_main() _ekf->fuseVtasData = false; } + if (newRangeData) { + _ekf->fuseRngData = true; + _ekf->useRangeFinder = true; + _ekf->RecallStates(_ekf->statesAtRngTime, (IMUmsec - 500.0f)); + _ekf->GroundEKF(); + } + // Output results math::Quaternion q(_ekf->states[0], _ekf->states[1], _ekf->states[2], _ekf->states[3]); @@ -1447,6 +1486,10 @@ FixedwingEstimator::task_main() _global_pos.vel_d = _local_pos.vz; } + /* terrain altitude */ + _global_pos.terrain_alt = _ekf->hgtRef - _ekf->flowStates[1]; + _global_pos.terrain_alt_valid = (_distance_last_valid > 0) && + (hrt_elapsed_time(&_distance_last_valid) < 20 * 1000 * 1000); _global_pos.yaw = _local_pos.yaw; @@ -1467,8 +1510,10 @@ FixedwingEstimator::task_main() if (hrt_elapsed_time(&_wind.timestamp) > 99000) { _wind.timestamp = _global_pos.timestamp; - _wind.windspeed_north = _ekf->states[14]; - _wind.windspeed_east = _ekf->states[15]; + _wind.windspeed_north = _ekf->windSpdFiltNorth; + _wind.windspeed_east = _ekf->windSpdFiltEast; + // XXX we need to do something smart about the covariance here + // but we default to the estimate covariance for now _wind.covariance_north = _ekf->P[14][14]; _wind.covariance_east = _ekf->P[15][15]; diff --git a/src/modules/ekf_att_pos_estimator/estimator_23states.cpp b/src/modules/ekf_att_pos_estimator/estimator_23states.cpp index c7c7305b2..94a6d165f 100644 --- a/src/modules/ekf_att_pos_estimator/estimator_23states.cpp +++ b/src/modules/ekf_att_pos_estimator/estimator_23states.cpp @@ -2,6 +2,11 @@ #include <string.h> #include <stdio.h> #include <stdarg.h> +#include <math.h> + +#ifndef M_PI_F +#define M_PI_F ((float)M_PI) +#endif #define EKF_COVARIANCE_DIVERGED 1.0e8f @@ -38,13 +43,14 @@ AttPosEKF::AttPosEKF() : resetStates{}, storedStates{}, statetimeStamp{}, + lastVelPosFusion(millis()), statesAtVelTime{}, statesAtPosTime{}, statesAtHgtTime{}, statesAtMagMeasTime{}, statesAtVtasMeasTime{}, statesAtRngTime{}, - statesAtOptFlowTime{}, + statesAtFlowTime{}, correctedDelAng(), correctedDelVel(), summedDelAng(), @@ -59,7 +65,16 @@ AttPosEKF::AttPosEKF() : accel(), dVelIMU(), dAngIMU(), - dtIMU(0), + dtIMU(0.005f), + dtIMUfilt(0.005f), + dtVelPos(0.01f), + dtVelPosFilt(0.01f), + dtHgtFilt(0.01f), + dtGpsFilt(0.1f), + windSpdFiltNorth(0.0f), + windSpdFiltEast(0.0f), + windSpdFiltAltitude(0.0f), + windSpdFiltClimb(0.0f), fusionModeGPS(0), innovVelPos{}, varInnovVelPos{}, @@ -103,13 +118,13 @@ AttPosEKF::AttPosEKF() : inhibitWindStates(true), inhibitMagStates(true), - inhibitGndHgtState(true), + inhibitGndState(true), onGround(true), staticMode(true), useAirspeed(true), useCompass(true), - useRangeFinder(false), + useRangeFinder(true), useOpticalFlow(false), ekfDiverged(false), @@ -117,7 +132,24 @@ AttPosEKF::AttPosEKF() : current_ekf_state{}, last_ekf_error{}, numericalProtection(true), - storeIndex(0) + storeIndex(0), + storedOmega{}, + Popt{}, + flowStates{}, + prevPosN(0.0f), + prevPosE(0.0f), + auxFlowObsInnov{}, + auxFlowObsInnovVar{}, + fScaleFactorVar(0.0f), + Tnb_flow{}, + R_LOS(0.0f), + auxFlowTestRatio{}, + auxRngTestRatio(0.0f), + flowInnovGate(0.0f), + auxFlowInnovGate(0.0f), + rngInnovGate(0.0f), + minFlowRng(0.0f), + moCompR_LOS(0.0f) { memset(&last_ekf_error, 0, sizeof(last_ekf_error)); memset(¤t_ekf_state, 0, sizeof(current_ekf_state)); @@ -260,6 +292,9 @@ void AttPosEKF::UpdateStrapdownEquationsNED() // Constrain states (to protect against filter divergence) ConstrainStates(); + + // update filtered IMU time step length + dtIMUfilt = 0.99f * dtIMUfilt + 0.01f * dtIMU; } void AttPosEKF::CovariancePrediction(float dt) @@ -312,7 +347,7 @@ void AttPosEKF::CovariancePrediction(float dt) } else { for (uint8_t i=16; i<=21; i++) processNoise[i] = 0; } - if (!inhibitGndHgtState) { + if (!inhibitGndState) { processNoise[22] = dt * sqrtf(sq(states[4]) + sq(states[5])) * gndHgtSigma; } else { processNoise[22] = 0; @@ -962,6 +997,21 @@ void AttPosEKF::CovariancePrediction(float dt) ConstrainVariances(); } +void AttPosEKF::updateDtGpsFilt(float dt) +{ + dtGpsFilt = ConstrainFloat(dt, 0.001f, 2.0f) * 0.05f + dtGpsFilt * 0.95f; +} + +void AttPosEKF::updateDtHgtFilt(float dt) +{ + dtHgtFilt = ConstrainFloat(dt, 0.001f, 2.0f) * 0.05f + dtHgtFilt * 0.95f; +} + +void AttPosEKF::updateDtVelPosFilt(float dt) +{ + dtVelPosFilt = ConstrainFloat(dt, 0.0005f, 2.0f) * 0.05f + dtVelPosFilt * 0.95f; +} + void AttPosEKF::FuseVelposNED() { @@ -998,6 +1048,18 @@ void AttPosEKF::FuseVelposNED() // associated with sequential fusion if (fuseVelData || fusePosData || fuseHgtData) { + uint64_t tNow = getMicros(); + updateDtVelPosFilt((tNow - lastVelPosFusion) / 1e6f); + lastVelPosFusion = tNow; + + // scaler according to the number of repetitions of the + // same measurement in one fusion step + float gpsVarianceScaler = dtGpsFilt / dtVelPosFilt; + + // scaler according to the number of repetitions of the + // same measurement in one fusion step + float hgtVarianceScaler = dtHgtFilt / dtVelPosFilt; + // set the GPS data timeout depending on whether airspeed data is present if (useAirspeed) horizRetryTime = gpsRetryTime; else horizRetryTime = gpsRetryTimeNoTAS; @@ -1010,12 +1072,12 @@ void AttPosEKF::FuseVelposNED() // Estimate the GPS Velocity, GPS horiz position and height measurement variances. velErr = 0.2f*accNavMag; // additional error in GPS velocities caused by manoeuvring posErr = 0.2f*accNavMag; // additional error in GPS position caused by manoeuvring - R_OBS[0] = sq(vneSigma) + sq(velErr); + R_OBS[0] = gpsVarianceScaler * sq(vneSigma) + sq(velErr); R_OBS[1] = R_OBS[0]; - R_OBS[2] = sq(vdSigma) + sq(velErr); - R_OBS[3] = sq(posNeSigma) + sq(posErr); + R_OBS[2] = gpsVarianceScaler * sq(vdSigma) + sq(velErr); + R_OBS[3] = gpsVarianceScaler * sq(posNeSigma) + sq(posErr); R_OBS[4] = R_OBS[3]; - R_OBS[5] = sq(posDSigma) + sq(posErr); + R_OBS[5] = hgtVarianceScaler * sq(posDSigma) + sq(posErr); // calculate innovations and check GPS data validity using an innovation consistency check if (fuseVelData) @@ -1173,7 +1235,7 @@ void AttPosEKF::FuseVelposNED() } } // Don't update terrain state if inhibited - if (inhibitGndHgtState) { + if (inhibitGndState) { Kfusion[22] = 0; } @@ -1356,7 +1418,7 @@ void AttPosEKF::FuseMagnetometer() Kfusion[i] = 0; } } - if (!inhibitGndHgtState) { + if (!inhibitGndState) { Kfusion[22] = SK_MX[0]*(P[22][19] + P[22][1]*SH_MAG[0] + P[22][3]*SH_MAG[2] + P[22][0]*SK_MX[3] - P[22][2]*SK_MX[2] - P[22][16]*SK_MX[1] + P[22][17]*SK_MX[5] - P[22][18]*SK_MX[4]); } else { Kfusion[22] = 0; @@ -1430,11 +1492,6 @@ void AttPosEKF::FuseMagnetometer() Kfusion[20] = 0; Kfusion[21] = 0; } - if (!inhibitGndHgtState) { - Kfusion[22] = SK_MY[0]*(P[22][20] + P[22][0]*SH_MAG[2] + P[22][1]*SH_MAG[1] + P[22][2]*SH_MAG[0] - P[22][3]*SK_MY[2] - P[22][17]*SK_MY[1] - P[22][16]*SK_MY[3] + P[22][18]*SK_MY[4]); - } else { - Kfusion[22] = 0; - } varInnovMag[1] = 1.0f/SK_MY[0]; innovMag[1] = MagPred[1] - magData.y; } @@ -1505,11 +1562,6 @@ void AttPosEKF::FuseMagnetometer() Kfusion[20] = 0; Kfusion[21] = 0; } - if (!inhibitGndHgtState) { - Kfusion[22] = SK_MZ[0]*(P[22][21] + P[22][0]*SH_MAG[1] + P[22][3]*SH_MAG[0] - P[22][1]*SK_MZ[2] + P[22][2]*SK_MZ[3] + P[22][18]*SK_MZ[1] + P[22][16]*SK_MZ[5] - P[22][17]*SK_MZ[4]); - } else { - Kfusion[22] = 0; - } varInnovMag[2] = 1.0f/SK_MZ[0]; innovMag[2] = MagPred[2] - magData.z; @@ -1616,6 +1668,32 @@ void AttPosEKF::FuseAirspeed() // Perform fusion of True Airspeed measurement if (useAirspeed && fuseVtasData && (VtasPred > 1.0f) && (VtasMeas > 8.0f)) { + + float altDiff = fabsf(windSpdFiltAltitude - hgtMea); + + if (isfinite(windSpdFiltClimb)) { + windSpdFiltClimb = ((1.0f - 0.0002f) * windSpdFiltClimb) + (0.0002f * states[6]); + } else { + windSpdFiltClimb = states[6]; + } + + if (altDiff < 20.0f) { + // Lowpass the output of the wind estimate - we want a long-term + // stable estimate, but not start to load into the overall dynamics + // of the system (which adjusting covariances would do) + + // Change filter coefficient based on altitude change rate + float windFiltCoeff = ConstrainFloat(fabsf(windSpdFiltClimb) / 1000.0f, 0.00005f, 0.2f); + + windSpdFiltNorth = ((1.0f - windFiltCoeff) * windSpdFiltNorth) + (windFiltCoeff * vwn); + windSpdFiltEast = ((1.0f - windFiltCoeff) * windSpdFiltEast) + (windFiltCoeff * vwe); + } else { + windSpdFiltNorth = vwn; + windSpdFiltEast = vwe; + } + + windSpdFiltAltitude = hgtMea; + // Calculate observation jacobians SH_TAS[0] = 1/(sqrt(sq(ve - vwe) + sq(vn - vwn) + sq(vd))); SH_TAS[1] = (SH_TAS[0]*(2.0f*ve - 2*vwe))/2.0f; @@ -1675,11 +1753,6 @@ void AttPosEKF::FuseAirspeed() Kfusion[i] = 0; } } - if (!inhibitGndHgtState) { - Kfusion[22] = SK_TAS*(P[22][4]*SH_TAS[2] - P[22][14]*SH_TAS[2] + P[22][5]*SH_TAS[1] - P[22][15]*SH_TAS[1] + P[22][6]*vd*SH_TAS[0]); - } else { - Kfusion[22] = 0; - } varInnovVtas = 1.0f/SK_TAS; // Calculate the measurement innovation @@ -1811,8 +1884,11 @@ void AttPosEKF::FuseRangeFinder() rngPred = (ptd - pd)/cosRngTilt; innovRng = rngPred - rngMea; - // Check the innovation for consistency and don't fuse if > 5Sigma - if ((innovRng*innovRng*SK_RNG[0]) < 25) + // calculate the innovation consistency test ratio + auxRngTestRatio = sq(innovRng) / (sq(rngInnovGate) * varInnovRng); + + // Check the innovation for consistency and don't fuse if out of bounds + if (auxRngTestRatio < 1.0f) { // correct the state vector states[22] = states[22] - Kfusion[22] * innovRng; @@ -1827,285 +1903,387 @@ void AttPosEKF::FuseRangeFinder() void AttPosEKF::FuseOptFlow() { - static uint8_t obsIndex; - static float SH_LOS[13]; - static float SKK_LOS[15]; - static float SK_LOS[2]; - static float q0 = 0.0f; - static float q1 = 0.0f; - static float q2 = 0.0f; - static float q3 = 1.0f; - static float vn = 0.0f; - static float ve = 0.0f; - static float vd = 0.0f; - static float pd = 0.0f; - static float ptd = 0.0f; - static float R_LOS = 0.01f; - static float losPred[2]; - - // Transformation matrix from nav to body axes - Mat3f Tnb_local; - // Transformation matrix from body to sensor axes - // assume camera is aligned with Z body axis plus a misalignment - // defined by 3 small angles about X, Y and Z body axis - Mat3f Tbs; - Tbs.x.y = a3; - Tbs.y.x = -a3; - Tbs.x.z = -a2; - Tbs.z.x = a2; - Tbs.y.z = a1; - Tbs.z.y = -a1; - // Transformation matrix from navigation to sensor axes - Mat3f Tns; - float H_LOS[n_states]; - for (uint8_t i = 0; i < n_states; i++) { - H_LOS[i] = 0.0f; - } - Vector3f velNED_local; - Vector3f relVelSensor; +// static uint8_t obsIndex; +// static float SH_LOS[13]; +// static float SKK_LOS[15]; +// static float SK_LOS[2]; +// static float q0 = 0.0f; +// static float q1 = 0.0f; +// static float q2 = 0.0f; +// static float q3 = 1.0f; +// static float vn = 0.0f; +// static float ve = 0.0f; +// static float vd = 0.0f; +// static float pd = 0.0f; +// static float ptd = 0.0f; +// static float R_LOS = 0.01f; +// static float losPred[2]; + +// // Transformation matrix from nav to body axes +// Mat3f Tnb_local; +// // Transformation matrix from body to sensor axes +// // assume camera is aligned with Z body axis plus a misalignment +// // defined by 3 small angles about X, Y and Z body axis +// Mat3f Tbs; +// Tbs.x.y = a3; +// Tbs.y.x = -a3; +// Tbs.x.z = -a2; +// Tbs.z.x = a2; +// Tbs.y.z = a1; +// Tbs.z.y = -a1; +// // Transformation matrix from navigation to sensor axes +// Mat3f Tns; +// float H_LOS[n_states]; +// for (uint8_t i = 0; i < n_states; i++) { +// H_LOS[i] = 0.0f; +// } +// Vector3f velNED_local; +// Vector3f relVelSensor; + +// // Perform sequential fusion of optical flow measurements only when in the air and tilt is less than 30 deg. +// if (useOpticalFlow && (fuseOptFlowData || obsIndex == 1) && !onGround && Tbs.z.z > 0.866f && rngMea > 5.0f && rngMea < 39.0f) +// { +// // Sequential fusion of XY components to spread processing load across +// // two prediction time steps. + +// // Calculate observation jacobians and Kalman gains +// if (fuseOptFlowData) +// { +// // Copy required states to local variable names +// q0 = statesAtOptFlowTime[0]; +// q1 = statesAtOptFlowTime[1]; +// q2 = statesAtOptFlowTime[2]; +// q3 = statesAtOptFlowTime[3]; +// vn = statesAtOptFlowTime[4]; +// ve = statesAtOptFlowTime[5]; +// vd = statesAtOptFlowTime[6]; +// pd = statesAtOptFlowTime[9]; +// ptd = statesAtOptFlowTime[22]; +// velNED_local.x = vn; +// velNED_local.y = ve; +// velNED_local.z = vd; + +// // calculate rotation from NED to body axes +// float q00 = sq(q0); +// float q11 = sq(q1); +// float q22 = sq(q2); +// float q33 = sq(q3); +// float q01 = q0 * q1; +// float q02 = q0 * q2; +// float q03 = q0 * q3; +// float q12 = q1 * q2; +// float q13 = q1 * q3; +// float q23 = q2 * q3; +// Tnb_local.x.x = q00 + q11 - q22 - q33; +// Tnb_local.y.y = q00 - q11 + q22 - q33; +// Tnb_local.z.z = q00 - q11 - q22 + q33; +// Tnb_local.y.x = 2*(q12 - q03); +// Tnb_local.z.x = 2*(q13 + q02); +// Tnb_local.x.y = 2*(q12 + q03); +// Tnb_local.z.y = 2*(q23 - q01); +// Tnb_local.x.z = 2*(q13 - q02); +// Tnb_local.y.z = 2*(q23 + q01); + +// // calculate transformation from NED to sensor axes +// Tns = Tbs*Tnb_local; + +// // calculate range from ground plain to centre of sensor fov assuming flat earth +// float range = ConstrainFloat(((ptd - pd)/Tns.z.z),0.5f,100.0f); + +// // calculate relative velocity in sensor frame +// relVelSensor = Tns*velNED_local; + +// // divide velocity by range and include angular rate effects to get predicted angular LOS rates relative to X and Y axes +// losPred[0] = relVelSensor.y/range; +// losPred[1] = -relVelSensor.x/range; + +// //printf("relVelSensor.x=%5.1f, relVelSensor.y=%5.1f\n", relVelSensor.x, relVelSensor.y); +// //printf("Xpred=%5.2f, Xmea=%5.2f, Ypred=%5.2f, Ymea=%5.2f, delAng.x=%4.4f, delAng.y=%4.4f\n", losPred[0], losData[0], losPred[1], losData[1], delAng.x, delAng.y); +// //printf("omegaX=%5.2f, omegaY=%5.2f, velY=%5.1f velX=%5.1f\n, range=%5.1f\n", delAngRel.x/dt, delAngRel.y/dt, relVelSensor.y, relVelSensor.x, range); + +// // Calculate observation jacobians +// SH_LOS[0] = a1*(2*q0*q1 + 2*q2*q3) + a2*(2*q0*q2 - 2*q1*q3) - sq(q0) + sq(q1) + sq(q2) - sq(q3); +// SH_LOS[1] = vd*(a2*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q2 - 2*q1*q3 - a3*(2*q0*q1 + 2*q2*q3)) - ve*(a3*(sq(q0) - sq(q1) + sq(q2) - sq(q3)) + 2*q0*q3 + 2*q1*q2 + a2*(2*q0*q1 - 2*q2*q3)) + vn*(a2*(2*q0*q2 + 2*q1*q3) + a3*(2*q0*q3 - 2*q1*q2) - sq(q0) - sq(q1) + sq(q2) + sq(q3)); +// SH_LOS[2] = ve*(a1*(2*q0*q1 - 2*q2*q3) + a3*(2*q0*q3 + 2*q1*q2) - sq(q0) + sq(q1) - sq(q2) + sq(q3)) - vd*(a1*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q1 + 2*q2*q3 + a3*(2*q0*q2 - 2*q1*q3)) + vn*(a3*(sq(q0) + sq(q1) - sq(q2) - sq(q3)) + 2*q0*q3 - 2*q1*q2 - a1*(2*q0*q2 + 2*q1*q3)); +// SH_LOS[3] = 1/(pd - ptd); +// SH_LOS[4] = 2*q1 - 2*a2*q3 + 2*a3*q2; +// SH_LOS[5] = 2*a2*q2 - 2*q0 + 2*a3*q3; +// SH_LOS[6] = 2*q2 + 2*a2*q0 - 2*a3*q1; +// SH_LOS[7] = 1/sq(pd - ptd); +// SH_LOS[8] = 2*q2 + 2*a1*q3 - 2*a3*q1; +// SH_LOS[9] = 2*q3 - 2*a1*q2 + 2*a3*q0; +// SH_LOS[10] = 2*a1*q1 - 2*q0 + 2*a3*q3; +// SH_LOS[11] = 2*q3 + 2*a2*q1 + 2*a3*q0; +// SH_LOS[12] = 2*q1 + 2*a1*q0 + 2*a3*q2; + +// for (uint8_t i = 0; i < n_states; i++) H_LOS[i] = 0; +// H_LOS[0] = - SH_LOS[2]*SH_LOS[3]*(2*a1*q1 - 2*q0 + 2*a2*q2) - SH_LOS[0]*SH_LOS[3]*(ve*SH_LOS[10] - vd*SH_LOS[12] + vn*SH_LOS[9]); +// H_LOS[1] = - SH_LOS[2]*SH_LOS[3]*(2*q1 + 2*a1*q0 - 2*a2*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[10] + ve*SH_LOS[12] - vn*SH_LOS[8]); +// H_LOS[2] = SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[9] + ve*SH_LOS[8] + vn*SH_LOS[12]) - SH_LOS[2]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3); +// H_LOS[3] = SH_LOS[2]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[8] - ve*SH_LOS[9] + vn*SH_LOS[10]); +// H_LOS[4] = -SH_LOS[0]*SH_LOS[3]*(a3*(sq(q0) + sq(q1) - sq(q2) - sq(q3)) + 2*q0*q3 - 2*q1*q2 - a1*(2*q0*q2 + 2*q1*q3)); +// H_LOS[5] = -SH_LOS[0]*SH_LOS[3]*(a1*(2*q0*q1 - 2*q2*q3) + a3*(2*q0*q3 + 2*q1*q2) - sq(q0) + sq(q1) - sq(q2) + sq(q3)); +// H_LOS[6] = SH_LOS[0]*SH_LOS[3]*(a1*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q1 + 2*q2*q3 + a3*(2*q0*q2 - 2*q1*q3)); +// H_LOS[9] = SH_LOS[0]*SH_LOS[2]*SH_LOS[7]; +// H_LOS[22] = -SH_LOS[0]*SH_LOS[2]*SH_LOS[7]; + +// // Calculate Kalman gain +// SKK_LOS[0] = a2*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q2 - 2*q1*q3 - a3*(2*q0*q1 + 2*q2*q3); +// SKK_LOS[1] = a3*(sq(q0) - sq(q1) + sq(q2) - sq(q3)) + 2*q0*q3 + 2*q1*q2 + a2*(2*q0*q1 - 2*q2*q3); +// SKK_LOS[2] = a2*(2*q0*q2 + 2*q1*q3) + a3*(2*q0*q3 - 2*q1*q2) - sq(q0) - sq(q1) + sq(q2) + sq(q3); +// SKK_LOS[3] = a1*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q1 + 2*q2*q3 + a3*(2*q0*q2 - 2*q1*q3); +// SKK_LOS[4] = a1*(2*q0*q1 - 2*q2*q3) + a3*(2*q0*q3 + 2*q1*q2) - sq(q0) + sq(q1) - sq(q2) + sq(q3); +// SKK_LOS[5] = a3*(sq(q0) + sq(q1) - sq(q2) - sq(q3)) + 2*q0*q3 - 2*q1*q2 - a1*(2*q0*q2 + 2*q1*q3); +// SKK_LOS[6] = SH_LOS[2]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[8] - ve*SH_LOS[9] + vn*SH_LOS[10]); +// SKK_LOS[7] = SH_LOS[2]*SH_LOS[3]*(2*q1 + 2*a1*q0 - 2*a2*q3) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[10] + ve*SH_LOS[12] - vn*SH_LOS[8]); +// SKK_LOS[8] = SH_LOS[2]*SH_LOS[3]*(2*a1*q1 - 2*q0 + 2*a2*q2) + SH_LOS[0]*SH_LOS[3]*(ve*SH_LOS[10] - vd*SH_LOS[12] + vn*SH_LOS[9]); +// SKK_LOS[9] = SH_LOS[2]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[9] + ve*SH_LOS[8] + vn*SH_LOS[12]); +// SKK_LOS[10] = SH_LOS[1]*SH_LOS[3]*(2*a1*q1 - 2*q0 + 2*a2*q2) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[6] - ve*SH_LOS[11] + vn*SH_LOS[5]); +// SKK_LOS[11] = SH_LOS[1]*SH_LOS[3]*(2*q1 + 2*a1*q0 - 2*a2*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[11] + ve*SH_LOS[6] + vn*SH_LOS[4]); +// SKK_LOS[12] = SH_LOS[1]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[5] + ve*SH_LOS[4] - vn*SH_LOS[6]); +// SKK_LOS[13] = SH_LOS[1]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) - SH_LOS[0]*SH_LOS[3]*(ve*SH_LOS[5] - vd*SH_LOS[4] + vn*SH_LOS[11]); +// SKK_LOS[14] = SH_LOS[0]; + +// SK_LOS[0] = 1/(R_LOS + SKK_LOS[8]*(P[0][0]*SKK_LOS[8] + P[1][0]*SKK_LOS[7] + P[2][0]*SKK_LOS[9] - P[3][0]*SKK_LOS[6] - P[9][0]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][0]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][0]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][0]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][0]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SKK_LOS[7]*(P[0][1]*SKK_LOS[8] + P[1][1]*SKK_LOS[7] + P[2][1]*SKK_LOS[9] - P[3][1]*SKK_LOS[6] - P[9][1]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][1]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][1]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][1]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][1]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SKK_LOS[9]*(P[0][2]*SKK_LOS[8] + P[1][2]*SKK_LOS[7] + P[2][2]*SKK_LOS[9] - P[3][2]*SKK_LOS[6] - P[9][2]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][2]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][2]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][2]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][2]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) - SKK_LOS[6]*(P[0][3]*SKK_LOS[8] + P[1][3]*SKK_LOS[7] + P[2][3]*SKK_LOS[9] - P[3][3]*SKK_LOS[6] - P[9][3]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][3]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][3]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][3]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][3]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) - SH_LOS[2]*SH_LOS[7]*SKK_LOS[14]*(P[0][9]*SKK_LOS[8] + P[1][9]*SKK_LOS[7] + P[2][9]*SKK_LOS[9] - P[3][9]*SKK_LOS[6] - P[9][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][9]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][9]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][9]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SH_LOS[2]*SH_LOS[7]*SKK_LOS[14]*(P[0][22]*SKK_LOS[8] + P[1][22]*SKK_LOS[7] + P[2][22]*SKK_LOS[9] - P[3][22]*SKK_LOS[6] - P[9][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][22]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][22]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][22]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14]*(P[0][4]*SKK_LOS[8] + P[1][4]*SKK_LOS[7] + P[2][4]*SKK_LOS[9] - P[3][4]*SKK_LOS[6] - P[9][4]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][4]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][4]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][4]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14]*(P[0][5]*SKK_LOS[8] + P[1][5]*SKK_LOS[7] + P[2][5]*SKK_LOS[9] - P[3][5]*SKK_LOS[6] - P[9][5]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][5]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][5]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][5]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) - SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]*(P[0][6]*SKK_LOS[8] + P[1][6]*SKK_LOS[7] + P[2][6]*SKK_LOS[9] - P[3][6]*SKK_LOS[6] - P[9][6]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][6]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][6]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][6]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14])); +// Kfusion[0] = -SK_LOS[0]*(P[0][0]*SKK_LOS[8] + P[0][1]*SKK_LOS[7] - P[0][3]*SKK_LOS[6] + P[0][2]*SKK_LOS[9] - P[0][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[0][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[0][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[0][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[0][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[1] = -SK_LOS[0]*(P[1][0]*SKK_LOS[8] + P[1][1]*SKK_LOS[7] - P[1][3]*SKK_LOS[6] + P[1][2]*SKK_LOS[9] - P[1][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[1][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[1][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[1][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[1][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[2] = -SK_LOS[0]*(P[2][0]*SKK_LOS[8] + P[2][1]*SKK_LOS[7] - P[2][3]*SKK_LOS[6] + P[2][2]*SKK_LOS[9] - P[2][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[2][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[2][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[2][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[2][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[3] = -SK_LOS[0]*(P[3][0]*SKK_LOS[8] + P[3][1]*SKK_LOS[7] - P[3][3]*SKK_LOS[6] + P[3][2]*SKK_LOS[9] - P[3][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[3][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[3][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[3][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[3][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[4] = -SK_LOS[0]*(P[4][0]*SKK_LOS[8] + P[4][1]*SKK_LOS[7] - P[4][3]*SKK_LOS[6] + P[4][2]*SKK_LOS[9] - P[4][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[4][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[4][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[5] = -SK_LOS[0]*(P[5][0]*SKK_LOS[8] + P[5][1]*SKK_LOS[7] - P[5][3]*SKK_LOS[6] + P[5][2]*SKK_LOS[9] - P[5][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[5][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[5][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[5][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[6] = -SK_LOS[0]*(P[6][0]*SKK_LOS[8] + P[6][1]*SKK_LOS[7] - P[6][3]*SKK_LOS[6] + P[6][2]*SKK_LOS[9] - P[6][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[6][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[6][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[6][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[7] = -SK_LOS[0]*(P[7][0]*SKK_LOS[8] + P[7][1]*SKK_LOS[7] - P[7][3]*SKK_LOS[6] + P[7][2]*SKK_LOS[9] - P[7][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[7][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[7][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[7][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[7][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[8] = -SK_LOS[0]*(P[8][0]*SKK_LOS[8] + P[8][1]*SKK_LOS[7] - P[8][3]*SKK_LOS[6] + P[8][2]*SKK_LOS[9] - P[8][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[8][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[8][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[8][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[8][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[9] = -SK_LOS[0]*(P[9][0]*SKK_LOS[8] + P[9][1]*SKK_LOS[7] - P[9][3]*SKK_LOS[6] + P[9][2]*SKK_LOS[9] - P[9][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[9][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[9][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[9][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[9][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[10] = -SK_LOS[0]*(P[10][0]*SKK_LOS[8] + P[10][1]*SKK_LOS[7] - P[10][3]*SKK_LOS[6] + P[10][2]*SKK_LOS[9] - P[10][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[10][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[10][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[10][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[10][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[11] = -SK_LOS[0]*(P[11][0]*SKK_LOS[8] + P[11][1]*SKK_LOS[7] - P[11][3]*SKK_LOS[6] + P[11][2]*SKK_LOS[9] - P[11][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[11][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[11][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[11][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[11][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[12] = -SK_LOS[0]*(P[12][0]*SKK_LOS[8] + P[12][1]*SKK_LOS[7] - P[12][3]*SKK_LOS[6] + P[12][2]*SKK_LOS[9] - P[12][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[12][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[12][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[12][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[12][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[13] = 0.0f;//-SK_LOS[0]*(P[13][0]*SKK_LOS[8] + P[13][1]*SKK_LOS[7] - P[13][3]*SKK_LOS[6] + P[13][2]*SKK_LOS[9] - P[13][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[13][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[13][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[13][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[13][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[14] = -SK_LOS[0]*(P[14][0]*SKK_LOS[8] + P[14][1]*SKK_LOS[7] - P[14][3]*SKK_LOS[6] + P[14][2]*SKK_LOS[9] - P[14][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[14][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[14][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[14][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[14][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[15] = -SK_LOS[0]*(P[15][0]*SKK_LOS[8] + P[15][1]*SKK_LOS[7] - P[15][3]*SKK_LOS[6] + P[15][2]*SKK_LOS[9] - P[15][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[15][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[15][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[15][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[15][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[16] = -SK_LOS[0]*(P[16][0]*SKK_LOS[8] + P[16][1]*SKK_LOS[7] - P[16][3]*SKK_LOS[6] + P[16][2]*SKK_LOS[9] - P[16][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[16][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[16][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[16][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[16][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[17] = -SK_LOS[0]*(P[17][0]*SKK_LOS[8] + P[17][1]*SKK_LOS[7] - P[17][3]*SKK_LOS[6] + P[17][2]*SKK_LOS[9] - P[17][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[17][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[17][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[17][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[17][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[18] = -SK_LOS[0]*(P[18][0]*SKK_LOS[8] + P[18][1]*SKK_LOS[7] - P[18][3]*SKK_LOS[6] + P[18][2]*SKK_LOS[9] - P[18][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[18][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[18][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[18][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[18][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[19] = -SK_LOS[0]*(P[19][0]*SKK_LOS[8] + P[19][1]*SKK_LOS[7] - P[19][3]*SKK_LOS[6] + P[19][2]*SKK_LOS[9] - P[19][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[19][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[19][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[19][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[19][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[20] = -SK_LOS[0]*(P[20][0]*SKK_LOS[8] + P[20][1]*SKK_LOS[7] - P[20][3]*SKK_LOS[6] + P[20][2]*SKK_LOS[9] - P[20][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[20][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[20][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[20][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[20][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[21] = -SK_LOS[0]*(P[21][0]*SKK_LOS[8] + P[21][1]*SKK_LOS[7] - P[21][3]*SKK_LOS[6] + P[21][2]*SKK_LOS[9] - P[21][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[21][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[21][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[21][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[21][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// Kfusion[22] = -SK_LOS[0]*(P[22][0]*SKK_LOS[8] + P[22][1]*SKK_LOS[7] - P[22][3]*SKK_LOS[6] + P[22][2]*SKK_LOS[9] - P[22][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[22][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[22][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); +// varInnovOptFlow[0] = 1.0f/SK_LOS[0]; +// innovOptFlow[0] = losPred[0] - losData[0]; + +// // set the observation index to 1 to fuse the y component next time round and reset the commence fusion flag +// obsIndex = 1; +// fuseOptFlowData = false; +// } +// else if (obsIndex == 1) // we are now fusing the Y measurement +// { +// // Calculate observation jacobians +// for (uint8_t i = 0; i < n_states; i++) H_LOS[i] = 0; +// H_LOS[0] = SH_LOS[1]*SH_LOS[3]*(2*a1*q1 - 2*q0 + 2*a2*q2) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[6] - ve*SH_LOS[11] + vn*SH_LOS[5]); +// H_LOS[1] = SH_LOS[1]*SH_LOS[3]*(2*q1 + 2*a1*q0 - 2*a2*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[11] + ve*SH_LOS[6] + vn*SH_LOS[4]); +// H_LOS[2] = SH_LOS[1]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[5] + ve*SH_LOS[4] - vn*SH_LOS[6]); +// H_LOS[3] = SH_LOS[0]*SH_LOS[3]*(ve*SH_LOS[5] - vd*SH_LOS[4] + vn*SH_LOS[11]) - SH_LOS[1]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1); +// H_LOS[4] = SH_LOS[0]*SH_LOS[3]*(a2*(2*q0*q2 + 2*q1*q3) + a3*(2*q0*q3 - 2*q1*q2) - sq(q0) - sq(q1) + sq(q2) + sq(q3)); +// H_LOS[5] = -SH_LOS[0]*SH_LOS[3]*(a3*(sq(q0) - sq(q1) + sq(q2) - sq(q3)) + 2*q0*q3 + 2*q1*q2 + a2*(2*q0*q1 - 2*q2*q3)); +// H_LOS[6] = SH_LOS[0]*SH_LOS[3]*(a2*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q2 - 2*q1*q3 - a3*(2*q0*q1 + 2*q2*q3)); +// H_LOS[9] = -SH_LOS[0]*SH_LOS[1]*SH_LOS[7]; +// H_LOS[22] = SH_LOS[0]*SH_LOS[1]*SH_LOS[7]; + +// // Calculate Kalman gains +// SK_LOS[1] = 1/(R_LOS + SKK_LOS[12]*(P[0][2]*SKK_LOS[10] + P[1][2]*SKK_LOS[11] + P[2][2]*SKK_LOS[12] - P[3][2]*SKK_LOS[13] - P[9][2]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][2]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][2]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][2]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][2]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) - SKK_LOS[13]*(P[0][3]*SKK_LOS[10] + P[1][3]*SKK_LOS[11] + P[2][3]*SKK_LOS[12] - P[3][3]*SKK_LOS[13] - P[9][3]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][3]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][3]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][3]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][3]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SKK_LOS[10]*(P[0][0]*SKK_LOS[10] + P[1][0]*SKK_LOS[11] + P[2][0]*(SH_LOS[1]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[3]*SKK_LOS[14]*(vd*SH_LOS[5] + ve*SH_LOS[4] - vn*SH_LOS[6])) - P[3][0]*(SH_LOS[1]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) - SH_LOS[3]*SKK_LOS[14]*(ve*SH_LOS[5] - vd*SH_LOS[4] + vn*SH_LOS[11])) - P[9][0]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][0]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][0]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][0]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][0]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SKK_LOS[11]*(P[0][1]*SKK_LOS[10] + P[1][1]*SKK_LOS[11] + P[2][1]*(SH_LOS[1]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[3]*SKK_LOS[14]*(vd*SH_LOS[5] + ve*SH_LOS[4] - vn*SH_LOS[6])) - P[3][1]*(SH_LOS[1]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) - SH_LOS[3]*SKK_LOS[14]*(ve*SH_LOS[5] - vd*SH_LOS[4] + vn*SH_LOS[11])) - P[9][1]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][1]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][1]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][1]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][1]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) - SH_LOS[1]*SH_LOS[7]*SKK_LOS[14]*(P[0][9]*SKK_LOS[10] + P[1][9]*SKK_LOS[11] + P[2][9]*SKK_LOS[12] - P[3][9]*SKK_LOS[13] - P[9][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][9]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][9]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][9]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SH_LOS[1]*SH_LOS[7]*SKK_LOS[14]*(P[0][22]*SKK_LOS[10] + P[1][22]*SKK_LOS[11] + P[2][22]*SKK_LOS[12] - P[3][22]*SKK_LOS[13] - P[9][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][22]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][22]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][22]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14]*(P[0][4]*SKK_LOS[10] + P[1][4]*SKK_LOS[11] + P[2][4]*SKK_LOS[12] - P[3][4]*SKK_LOS[13] - P[9][4]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][4]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][4]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][4]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) - SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]*(P[0][5]*SKK_LOS[10] + P[1][5]*SKK_LOS[11] + P[2][5]*SKK_LOS[12] - P[3][5]*SKK_LOS[13] - P[9][5]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][5]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][5]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][5]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]*(P[0][6]*SKK_LOS[10] + P[1][6]*SKK_LOS[11] + P[2][6]*SKK_LOS[12] - P[3][6]*SKK_LOS[13] - P[9][6]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][6]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][6]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][6]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14])); +// Kfusion[0] = SK_LOS[1]*(P[0][0]*SKK_LOS[10] - P[0][3]*SKK_LOS[13] + P[0][1]*SKK_LOS[11] + P[0][2]*SKK_LOS[12] - P[0][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[0][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[0][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[0][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[0][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[1] = SK_LOS[1]*(P[1][0]*SKK_LOS[10] - P[1][3]*SKK_LOS[13] + P[1][1]*SKK_LOS[11] + P[1][2]*SKK_LOS[12] - P[1][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[1][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[1][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[1][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[1][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[2] = SK_LOS[1]*(P[2][0]*SKK_LOS[10] - P[2][3]*SKK_LOS[13] + P[2][1]*SKK_LOS[11] + P[2][2]*SKK_LOS[12] - P[2][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[2][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[2][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[2][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[2][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[3] = SK_LOS[1]*(P[3][0]*SKK_LOS[10] - P[3][3]*SKK_LOS[13] + P[3][1]*SKK_LOS[11] + P[3][2]*SKK_LOS[12] - P[3][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[3][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[3][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[3][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[3][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[4] = SK_LOS[1]*(P[4][0]*SKK_LOS[10] - P[4][3]*SKK_LOS[13] + P[4][1]*SKK_LOS[11] + P[4][2]*SKK_LOS[12] - P[4][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[4][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[4][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[5] = SK_LOS[1]*(P[5][0]*SKK_LOS[10] - P[5][3]*SKK_LOS[13] + P[5][1]*SKK_LOS[11] + P[5][2]*SKK_LOS[12] - P[5][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[5][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[5][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[5][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[6] = SK_LOS[1]*(P[6][0]*SKK_LOS[10] - P[6][3]*SKK_LOS[13] + P[6][1]*SKK_LOS[11] + P[6][2]*SKK_LOS[12] - P[6][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[6][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[6][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[6][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[6][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[7] = SK_LOS[1]*(P[7][0]*SKK_LOS[10] - P[7][3]*SKK_LOS[13] + P[7][1]*SKK_LOS[11] + P[7][2]*SKK_LOS[12] - P[7][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[7][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[7][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[7][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[7][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[8] = SK_LOS[1]*(P[8][0]*SKK_LOS[10] - P[8][3]*SKK_LOS[13] + P[8][1]*SKK_LOS[11] + P[8][2]*SKK_LOS[12] - P[8][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[8][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[8][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[8][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[8][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[9] = SK_LOS[1]*(P[9][0]*SKK_LOS[10] - P[9][3]*SKK_LOS[13] + P[9][1]*SKK_LOS[11] + P[9][2]*SKK_LOS[12] - P[9][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[9][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[9][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[9][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[9][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[10] = SK_LOS[1]*(P[10][0]*SKK_LOS[10] - P[10][3]*SKK_LOS[13] + P[10][1]*SKK_LOS[11] + P[10][2]*SKK_LOS[12] - P[10][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[10][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[10][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[10][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[10][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[11] = SK_LOS[1]*(P[11][0]*SKK_LOS[10] - P[11][3]*SKK_LOS[13] + P[11][1]*SKK_LOS[11] + P[11][2]*SKK_LOS[12] - P[11][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[11][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[11][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[11][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[11][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[12] = SK_LOS[1]*(P[12][0]*SKK_LOS[10] - P[12][3]*SKK_LOS[13] + P[12][1]*SKK_LOS[11] + P[12][2]*SKK_LOS[12] - P[12][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[12][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[12][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[12][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[12][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[13] = 0.0f;//SK_LOS[1]*(P[13][0]*SKK_LOS[10] - P[13][3]*SKK_LOS[13] + P[13][1]*SKK_LOS[11] + P[13][2]*SKK_LOS[12] - P[13][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[13][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[13][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[13][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[13][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[14] = SK_LOS[1]*(P[14][0]*SKK_LOS[10] - P[14][3]*SKK_LOS[13] + P[14][1]*SKK_LOS[11] + P[14][2]*SKK_LOS[12] - P[14][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[14][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[14][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[14][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[14][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[15] = SK_LOS[1]*(P[15][0]*SKK_LOS[10] - P[15][3]*SKK_LOS[13] + P[15][1]*SKK_LOS[11] + P[15][2]*SKK_LOS[12] - P[15][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[15][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[15][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[15][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[15][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[16] = SK_LOS[1]*(P[16][0]*SKK_LOS[10] - P[16][3]*SKK_LOS[13] + P[16][1]*SKK_LOS[11] + P[16][2]*SKK_LOS[12] - P[16][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[16][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[16][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[16][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[16][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[17] = SK_LOS[1]*(P[17][0]*SKK_LOS[10] - P[17][3]*SKK_LOS[13] + P[17][1]*SKK_LOS[11] + P[17][2]*SKK_LOS[12] - P[17][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[17][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[17][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[17][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[17][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[18] = SK_LOS[1]*(P[18][0]*SKK_LOS[10] - P[18][3]*SKK_LOS[13] + P[18][1]*SKK_LOS[11] + P[18][2]*SKK_LOS[12] - P[18][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[18][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[18][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[18][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[18][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[19] = SK_LOS[1]*(P[19][0]*SKK_LOS[10] - P[19][3]*SKK_LOS[13] + P[19][1]*SKK_LOS[11] + P[19][2]*SKK_LOS[12] - P[19][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[19][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[19][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[19][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[19][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[20] = SK_LOS[1]*(P[20][0]*SKK_LOS[10] - P[20][3]*SKK_LOS[13] + P[20][1]*SKK_LOS[11] + P[20][2]*SKK_LOS[12] - P[20][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[20][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[20][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[20][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[20][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[21] = SK_LOS[1]*(P[21][0]*SKK_LOS[10] - P[21][3]*SKK_LOS[13] + P[21][1]*SKK_LOS[11] + P[21][2]*SKK_LOS[12] - P[21][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[21][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[21][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[21][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[21][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// Kfusion[22] = SK_LOS[1]*(P[22][0]*SKK_LOS[10] - P[22][3]*SKK_LOS[13] + P[22][1]*SKK_LOS[11] + P[22][2]*SKK_LOS[12] - P[22][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[22][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[22][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); +// varInnovOptFlow[1] = 1.0f/SK_LOS[1]; +// innovOptFlow[1] = losPred[1] - losData[1]; + +// // reset the observation index +// obsIndex = 0; +// fuseOptFlowData = false; +// } + +// // Check the innovation for consistency and don't fuse if > 3Sigma +// if ((innovOptFlow[obsIndex]*innovOptFlow[obsIndex]/varInnovOptFlow[obsIndex]) < 9.0f) +// { +// // correct the state vector +// for (uint8_t j = 0; j < n_states; j++) +// { +// states[j] = states[j] - Kfusion[j] * innovOptFlow[obsIndex]; +// } +// // normalise the quaternion states +// float quatMag = sqrt(states[0]*states[0] + states[1]*states[1] + states[2]*states[2] + states[3]*states[3]); +// if (quatMag > 1e-12f) +// { +// for (uint8_t j= 0; j<=3; j++) +// { +// float quatMagInv = 1.0f/quatMag; +// states[j] = states[j] * quatMagInv; +// } +// } +// // correct the covariance P = (I - K*H)*P +// // take advantage of the empty columns in KH to reduce the +// // number of operations +// for (uint8_t i = 0; i < n_states; i++) +// { +// for (uint8_t j = 0; j <= 6; j++) +// { +// KH[i][j] = Kfusion[i] * H_LOS[j]; +// } +// for (uint8_t j = 7; j <= 8; j++) +// { +// KH[i][j] = 0.0f; +// } +// KH[i][9] = Kfusion[i] * H_LOS[9]; +// for (uint8_t j = 10; j <= 21; j++) +// { +// KH[i][j] = 0.0f; +// } +// KH[i][22] = Kfusion[i] * H_LOS[22]; +// } +// for (uint8_t i = 0; i < n_states; i++) +// { +// for (uint8_t j = 0; j < n_states; j++) +// { +// KHP[i][j] = 0.0f; +// for (uint8_t k = 0; k <= 6; k++) +// { +// KHP[i][j] = KHP[i][j] + KH[i][k] * P[k][j]; +// } +// KHP[i][j] = KHP[i][j] + KH[i][9] * P[9][j]; +// KHP[i][j] = KHP[i][j] + KH[i][22] * P[2][j]; +// } +// } +// } +// for (uint8_t i = 0; i < n_states; i++) +// { +// for (uint8_t j = 0; j < n_states; j++) +// { +// P[i][j] = P[i][j] - KHP[i][j]; +// } +// } +// ForceSymmetry(); +// ConstrainVariances(); +// } +} -// Perform sequential fusion of optical flow measurements only when in the air and tilt is less than 30 deg. - if (useOpticalFlow && (fuseOptFlowData || obsIndex == 1) && !onGround && Tbs.z.z > 0.866f && rngMea > 5.0f && rngMea < 39.0f) - { - // Sequential fusion of XY components to spread processing load across - // two prediction time steps. +/* +Estimation of optical flow sensor focal length scale factor and terrain height using a two state EKF +This fiter requires optical flow rates that are not motion compensated +Range to ground measurement is assumed to be via a narrow beam type sensor - eg laser +*/ +void AttPosEKF::GroundEKF() +{ + // propagate ground position state noise each time this is called using the difference in position since the last observations and an RMS gradient assumption + // limit distance to prevent intialisation afer bad gps causing bad numerical conditioning + if (!inhibitGndState) { + float distanceTravelledSq; + distanceTravelledSq = sq(statesAtRngTime[7] - prevPosN) + sq(statesAtRngTime[8] - prevPosE); + prevPosN = statesAtRngTime[7]; + prevPosE = statesAtRngTime[8]; + distanceTravelledSq = min(distanceTravelledSq, 100.0f); + Popt[1][1] += (distanceTravelledSq * sq(gndHgtSigma)); + } + // we aren't using optical flow measurements in this hacked implementation so set the covariances for this state to zero to avoid numerical problems + Popt[0][0] = 0.0f; + Popt[0][1] = 0.0f; + Popt[1][0] = 0.0f; + + // Fuse range finder data + // Need to check that our range finder tilt angle is less than 30 degrees + float cosRngTilt = - Tbn.z.x * sinf(rngFinderPitch) + Tbn.z.z * cosf(rngFinderPitch); + if (useRangeFinder && fuseRngData && cosRngTilt > 0.87f) { + float range; // range from camera to centre of image + float q0; // quaternion at optical flow measurement time + float q1; // quaternion at optical flow measurement time + float q2; // quaternion at optical flow measurement time + float q3; // quaternion at optical flow measurement time + float R_RNG = 0.5; // range measurement variance (m^2) TODO make this a function of range and tilt to allow for sensor, alignment and AHRS errors + + // Copy required states to local variable names + q0 = statesAtRngTime[0]; + q1 = statesAtRngTime[1]; + q2 = statesAtRngTime[2]; + q3 = statesAtRngTime[3]; + + // calculate Kalman gains + float SK_RNG[3]; + SK_RNG[0] = sq(q0) - sq(q1) - sq(q2) + sq(q3); + SK_RNG[1] = 1/(R_RNG + Popt[1][1]/sq(SK_RNG[0])); + SK_RNG[2] = 1/SK_RNG[0]; + float K_RNG[2]; + if (!inhibitScaleState) { + K_RNG[0] = Popt[0][1]*SK_RNG[1]*SK_RNG[2]; + } else { + K_RNG[0] = 0.0f; + } + if (!inhibitGndState) { + K_RNG[1] = Popt[1][1]*SK_RNG[1]*SK_RNG[2]; + } else { + K_RNG[1] = 0.0f; + } - // Calculate observation jacobians and Kalman gains - if (fuseOptFlowData) - { - // Copy required states to local variable names - q0 = statesAtOptFlowTime[0]; - q1 = statesAtOptFlowTime[1]; - q2 = statesAtOptFlowTime[2]; - q3 = statesAtOptFlowTime[3]; - vn = statesAtOptFlowTime[4]; - ve = statesAtOptFlowTime[5]; - vd = statesAtOptFlowTime[6]; - pd = statesAtOptFlowTime[9]; - ptd = statesAtOptFlowTime[22]; - velNED_local.x = vn; - velNED_local.y = ve; - velNED_local.z = vd; - - // calculate rotation from NED to body axes - float q00 = sq(q0); - float q11 = sq(q1); - float q22 = sq(q2); - float q33 = sq(q3); - float q01 = q0 * q1; - float q02 = q0 * q2; - float q03 = q0 * q3; - float q12 = q1 * q2; - float q13 = q1 * q3; - float q23 = q2 * q3; - Tnb_local.x.x = q00 + q11 - q22 - q33; - Tnb_local.y.y = q00 - q11 + q22 - q33; - Tnb_local.z.z = q00 - q11 - q22 + q33; - Tnb_local.y.x = 2*(q12 - q03); - Tnb_local.z.x = 2*(q13 + q02); - Tnb_local.x.y = 2*(q12 + q03); - Tnb_local.z.y = 2*(q23 - q01); - Tnb_local.x.z = 2*(q13 - q02); - Tnb_local.y.z = 2*(q23 + q01); - - // calculate transformation from NED to sensor axes - Tns = Tbs*Tnb_local; - - // calculate range from ground plain to centre of sensor fov assuming flat earth - float range = ConstrainFloat(((ptd - pd)/Tns.z.z),0.5f,100.0f); - - // calculate relative velocity in sensor frame - relVelSensor = Tns*velNED_local; - - // divide velocity by range and include angular rate effects to get predicted angular LOS rates relative to X and Y axes - losPred[0] = relVelSensor.y/range; - losPred[1] = -relVelSensor.x/range; - - //printf("relVelSensor.x=%5.1f, relVelSensor.y=%5.1f\n", relVelSensor.x, relVelSensor.y); - //printf("Xpred=%5.2f, Xmea=%5.2f, Ypred=%5.2f, Ymea=%5.2f, delAng.x=%4.4f, delAng.y=%4.4f\n", losPred[0], losData[0], losPred[1], losData[1], delAng.x, delAng.y); - //printf("omegaX=%5.2f, omegaY=%5.2f, velY=%5.1f velX=%5.1f\n, range=%5.1f\n", delAngRel.x/dt, delAngRel.y/dt, relVelSensor.y, relVelSensor.x, range); + // Calculate the innovation variance for data logging + varInnovRng = 1.0f/SK_RNG[1]; - // Calculate observation jacobians - SH_LOS[0] = a1*(2*q0*q1 + 2*q2*q3) + a2*(2*q0*q2 - 2*q1*q3) - sq(q0) + sq(q1) + sq(q2) - sq(q3); - SH_LOS[1] = vd*(a2*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q2 - 2*q1*q3 - a3*(2*q0*q1 + 2*q2*q3)) - ve*(a3*(sq(q0) - sq(q1) + sq(q2) - sq(q3)) + 2*q0*q3 + 2*q1*q2 + a2*(2*q0*q1 - 2*q2*q3)) + vn*(a2*(2*q0*q2 + 2*q1*q3) + a3*(2*q0*q3 - 2*q1*q2) - sq(q0) - sq(q1) + sq(q2) + sq(q3)); - SH_LOS[2] = ve*(a1*(2*q0*q1 - 2*q2*q3) + a3*(2*q0*q3 + 2*q1*q2) - sq(q0) + sq(q1) - sq(q2) + sq(q3)) - vd*(a1*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q1 + 2*q2*q3 + a3*(2*q0*q2 - 2*q1*q3)) + vn*(a3*(sq(q0) + sq(q1) - sq(q2) - sq(q3)) + 2*q0*q3 - 2*q1*q2 - a1*(2*q0*q2 + 2*q1*q3)); - SH_LOS[3] = 1/(pd - ptd); - SH_LOS[4] = 2*q1 - 2*a2*q3 + 2*a3*q2; - SH_LOS[5] = 2*a2*q2 - 2*q0 + 2*a3*q3; - SH_LOS[6] = 2*q2 + 2*a2*q0 - 2*a3*q1; - SH_LOS[7] = 1/sq(pd - ptd); - SH_LOS[8] = 2*q2 + 2*a1*q3 - 2*a3*q1; - SH_LOS[9] = 2*q3 - 2*a1*q2 + 2*a3*q0; - SH_LOS[10] = 2*a1*q1 - 2*q0 + 2*a3*q3; - SH_LOS[11] = 2*q3 + 2*a2*q1 + 2*a3*q0; - SH_LOS[12] = 2*q1 + 2*a1*q0 + 2*a3*q2; - - for (uint8_t i = 0; i < n_states; i++) H_LOS[i] = 0; - H_LOS[0] = - SH_LOS[2]*SH_LOS[3]*(2*a1*q1 - 2*q0 + 2*a2*q2) - SH_LOS[0]*SH_LOS[3]*(ve*SH_LOS[10] - vd*SH_LOS[12] + vn*SH_LOS[9]); - H_LOS[1] = - SH_LOS[2]*SH_LOS[3]*(2*q1 + 2*a1*q0 - 2*a2*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[10] + ve*SH_LOS[12] - vn*SH_LOS[8]); - H_LOS[2] = SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[9] + ve*SH_LOS[8] + vn*SH_LOS[12]) - SH_LOS[2]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3); - H_LOS[3] = SH_LOS[2]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[8] - ve*SH_LOS[9] + vn*SH_LOS[10]); - H_LOS[4] = -SH_LOS[0]*SH_LOS[3]*(a3*(sq(q0) + sq(q1) - sq(q2) - sq(q3)) + 2*q0*q3 - 2*q1*q2 - a1*(2*q0*q2 + 2*q1*q3)); - H_LOS[5] = -SH_LOS[0]*SH_LOS[3]*(a1*(2*q0*q1 - 2*q2*q3) + a3*(2*q0*q3 + 2*q1*q2) - sq(q0) + sq(q1) - sq(q2) + sq(q3)); - H_LOS[6] = SH_LOS[0]*SH_LOS[3]*(a1*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q1 + 2*q2*q3 + a3*(2*q0*q2 - 2*q1*q3)); - H_LOS[9] = SH_LOS[0]*SH_LOS[2]*SH_LOS[7]; - H_LOS[22] = -SH_LOS[0]*SH_LOS[2]*SH_LOS[7]; + // constrain terrain height to be below the vehicle + flowStates[1] = maxf(flowStates[1], statesAtRngTime[9] + minFlowRng); - // Calculate Kalman gain - SKK_LOS[0] = a2*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q2 - 2*q1*q3 - a3*(2*q0*q1 + 2*q2*q3); - SKK_LOS[1] = a3*(sq(q0) - sq(q1) + sq(q2) - sq(q3)) + 2*q0*q3 + 2*q1*q2 + a2*(2*q0*q1 - 2*q2*q3); - SKK_LOS[2] = a2*(2*q0*q2 + 2*q1*q3) + a3*(2*q0*q3 - 2*q1*q2) - sq(q0) - sq(q1) + sq(q2) + sq(q3); - SKK_LOS[3] = a1*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q1 + 2*q2*q3 + a3*(2*q0*q2 - 2*q1*q3); - SKK_LOS[4] = a1*(2*q0*q1 - 2*q2*q3) + a3*(2*q0*q3 + 2*q1*q2) - sq(q0) + sq(q1) - sq(q2) + sq(q3); - SKK_LOS[5] = a3*(sq(q0) + sq(q1) - sq(q2) - sq(q3)) + 2*q0*q3 - 2*q1*q2 - a1*(2*q0*q2 + 2*q1*q3); - SKK_LOS[6] = SH_LOS[2]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[8] - ve*SH_LOS[9] + vn*SH_LOS[10]); - SKK_LOS[7] = SH_LOS[2]*SH_LOS[3]*(2*q1 + 2*a1*q0 - 2*a2*q3) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[10] + ve*SH_LOS[12] - vn*SH_LOS[8]); - SKK_LOS[8] = SH_LOS[2]*SH_LOS[3]*(2*a1*q1 - 2*q0 + 2*a2*q2) + SH_LOS[0]*SH_LOS[3]*(ve*SH_LOS[10] - vd*SH_LOS[12] + vn*SH_LOS[9]); - SKK_LOS[9] = SH_LOS[2]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[9] + ve*SH_LOS[8] + vn*SH_LOS[12]); - SKK_LOS[10] = SH_LOS[1]*SH_LOS[3]*(2*a1*q1 - 2*q0 + 2*a2*q2) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[6] - ve*SH_LOS[11] + vn*SH_LOS[5]); - SKK_LOS[11] = SH_LOS[1]*SH_LOS[3]*(2*q1 + 2*a1*q0 - 2*a2*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[11] + ve*SH_LOS[6] + vn*SH_LOS[4]); - SKK_LOS[12] = SH_LOS[1]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[5] + ve*SH_LOS[4] - vn*SH_LOS[6]); - SKK_LOS[13] = SH_LOS[1]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) - SH_LOS[0]*SH_LOS[3]*(ve*SH_LOS[5] - vd*SH_LOS[4] + vn*SH_LOS[11]); - SKK_LOS[14] = SH_LOS[0]; - - SK_LOS[0] = 1/(R_LOS + SKK_LOS[8]*(P[0][0]*SKK_LOS[8] + P[1][0]*SKK_LOS[7] + P[2][0]*SKK_LOS[9] - P[3][0]*SKK_LOS[6] - P[9][0]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][0]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][0]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][0]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][0]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SKK_LOS[7]*(P[0][1]*SKK_LOS[8] + P[1][1]*SKK_LOS[7] + P[2][1]*SKK_LOS[9] - P[3][1]*SKK_LOS[6] - P[9][1]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][1]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][1]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][1]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][1]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SKK_LOS[9]*(P[0][2]*SKK_LOS[8] + P[1][2]*SKK_LOS[7] + P[2][2]*SKK_LOS[9] - P[3][2]*SKK_LOS[6] - P[9][2]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][2]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][2]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][2]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][2]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) - SKK_LOS[6]*(P[0][3]*SKK_LOS[8] + P[1][3]*SKK_LOS[7] + P[2][3]*SKK_LOS[9] - P[3][3]*SKK_LOS[6] - P[9][3]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][3]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][3]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][3]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][3]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) - SH_LOS[2]*SH_LOS[7]*SKK_LOS[14]*(P[0][9]*SKK_LOS[8] + P[1][9]*SKK_LOS[7] + P[2][9]*SKK_LOS[9] - P[3][9]*SKK_LOS[6] - P[9][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][9]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][9]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][9]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SH_LOS[2]*SH_LOS[7]*SKK_LOS[14]*(P[0][22]*SKK_LOS[8] + P[1][22]*SKK_LOS[7] + P[2][22]*SKK_LOS[9] - P[3][22]*SKK_LOS[6] - P[9][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][22]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][22]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][22]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14]*(P[0][4]*SKK_LOS[8] + P[1][4]*SKK_LOS[7] + P[2][4]*SKK_LOS[9] - P[3][4]*SKK_LOS[6] - P[9][4]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][4]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][4]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][4]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) + SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14]*(P[0][5]*SKK_LOS[8] + P[1][5]*SKK_LOS[7] + P[2][5]*SKK_LOS[9] - P[3][5]*SKK_LOS[6] - P[9][5]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][5]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][5]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][5]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]) - SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]*(P[0][6]*SKK_LOS[8] + P[1][6]*SKK_LOS[7] + P[2][6]*SKK_LOS[9] - P[3][6]*SKK_LOS[6] - P[9][6]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][6]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][6]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][6]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14])); - Kfusion[0] = -SK_LOS[0]*(P[0][0]*SKK_LOS[8] + P[0][1]*SKK_LOS[7] - P[0][3]*SKK_LOS[6] + P[0][2]*SKK_LOS[9] - P[0][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[0][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[0][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[0][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[0][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[1] = -SK_LOS[0]*(P[1][0]*SKK_LOS[8] + P[1][1]*SKK_LOS[7] - P[1][3]*SKK_LOS[6] + P[1][2]*SKK_LOS[9] - P[1][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[1][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[1][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[1][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[1][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[2] = -SK_LOS[0]*(P[2][0]*SKK_LOS[8] + P[2][1]*SKK_LOS[7] - P[2][3]*SKK_LOS[6] + P[2][2]*SKK_LOS[9] - P[2][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[2][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[2][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[2][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[2][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[3] = -SK_LOS[0]*(P[3][0]*SKK_LOS[8] + P[3][1]*SKK_LOS[7] - P[3][3]*SKK_LOS[6] + P[3][2]*SKK_LOS[9] - P[3][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[3][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[3][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[3][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[3][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[4] = -SK_LOS[0]*(P[4][0]*SKK_LOS[8] + P[4][1]*SKK_LOS[7] - P[4][3]*SKK_LOS[6] + P[4][2]*SKK_LOS[9] - P[4][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[4][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[4][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[4][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[5] = -SK_LOS[0]*(P[5][0]*SKK_LOS[8] + P[5][1]*SKK_LOS[7] - P[5][3]*SKK_LOS[6] + P[5][2]*SKK_LOS[9] - P[5][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[5][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[5][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[5][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[5][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[6] = -SK_LOS[0]*(P[6][0]*SKK_LOS[8] + P[6][1]*SKK_LOS[7] - P[6][3]*SKK_LOS[6] + P[6][2]*SKK_LOS[9] - P[6][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[6][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[6][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[6][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[6][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[7] = -SK_LOS[0]*(P[7][0]*SKK_LOS[8] + P[7][1]*SKK_LOS[7] - P[7][3]*SKK_LOS[6] + P[7][2]*SKK_LOS[9] - P[7][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[7][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[7][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[7][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[7][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[8] = -SK_LOS[0]*(P[8][0]*SKK_LOS[8] + P[8][1]*SKK_LOS[7] - P[8][3]*SKK_LOS[6] + P[8][2]*SKK_LOS[9] - P[8][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[8][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[8][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[8][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[8][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[9] = -SK_LOS[0]*(P[9][0]*SKK_LOS[8] + P[9][1]*SKK_LOS[7] - P[9][3]*SKK_LOS[6] + P[9][2]*SKK_LOS[9] - P[9][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[9][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[9][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[9][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[9][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[10] = -SK_LOS[0]*(P[10][0]*SKK_LOS[8] + P[10][1]*SKK_LOS[7] - P[10][3]*SKK_LOS[6] + P[10][2]*SKK_LOS[9] - P[10][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[10][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[10][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[10][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[10][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[11] = -SK_LOS[0]*(P[11][0]*SKK_LOS[8] + P[11][1]*SKK_LOS[7] - P[11][3]*SKK_LOS[6] + P[11][2]*SKK_LOS[9] - P[11][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[11][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[11][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[11][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[11][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[12] = -SK_LOS[0]*(P[12][0]*SKK_LOS[8] + P[12][1]*SKK_LOS[7] - P[12][3]*SKK_LOS[6] + P[12][2]*SKK_LOS[9] - P[12][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[12][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[12][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[12][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[12][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[13] = 0.0f;//-SK_LOS[0]*(P[13][0]*SKK_LOS[8] + P[13][1]*SKK_LOS[7] - P[13][3]*SKK_LOS[6] + P[13][2]*SKK_LOS[9] - P[13][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[13][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[13][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[13][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[13][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[14] = -SK_LOS[0]*(P[14][0]*SKK_LOS[8] + P[14][1]*SKK_LOS[7] - P[14][3]*SKK_LOS[6] + P[14][2]*SKK_LOS[9] - P[14][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[14][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[14][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[14][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[14][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[15] = -SK_LOS[0]*(P[15][0]*SKK_LOS[8] + P[15][1]*SKK_LOS[7] - P[15][3]*SKK_LOS[6] + P[15][2]*SKK_LOS[9] - P[15][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[15][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[15][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[15][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[15][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[16] = -SK_LOS[0]*(P[16][0]*SKK_LOS[8] + P[16][1]*SKK_LOS[7] - P[16][3]*SKK_LOS[6] + P[16][2]*SKK_LOS[9] - P[16][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[16][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[16][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[16][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[16][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[17] = -SK_LOS[0]*(P[17][0]*SKK_LOS[8] + P[17][1]*SKK_LOS[7] - P[17][3]*SKK_LOS[6] + P[17][2]*SKK_LOS[9] - P[17][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[17][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[17][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[17][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[17][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[18] = -SK_LOS[0]*(P[18][0]*SKK_LOS[8] + P[18][1]*SKK_LOS[7] - P[18][3]*SKK_LOS[6] + P[18][2]*SKK_LOS[9] - P[18][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[18][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[18][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[18][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[18][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[19] = -SK_LOS[0]*(P[19][0]*SKK_LOS[8] + P[19][1]*SKK_LOS[7] - P[19][3]*SKK_LOS[6] + P[19][2]*SKK_LOS[9] - P[19][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[19][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[19][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[19][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[19][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[20] = -SK_LOS[0]*(P[20][0]*SKK_LOS[8] + P[20][1]*SKK_LOS[7] - P[20][3]*SKK_LOS[6] + P[20][2]*SKK_LOS[9] - P[20][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[20][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[20][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[20][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[20][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[21] = -SK_LOS[0]*(P[21][0]*SKK_LOS[8] + P[21][1]*SKK_LOS[7] - P[21][3]*SKK_LOS[6] + P[21][2]*SKK_LOS[9] - P[21][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[21][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[21][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[21][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[21][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - Kfusion[22] = -SK_LOS[0]*(P[22][0]*SKK_LOS[8] + P[22][1]*SKK_LOS[7] - P[22][3]*SKK_LOS[6] + P[22][2]*SKK_LOS[9] - P[22][9]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][22]*SH_LOS[2]*SH_LOS[7]*SKK_LOS[14] + P[22][4]*SH_LOS[3]*SKK_LOS[5]*SKK_LOS[14] + P[22][5]*SH_LOS[3]*SKK_LOS[4]*SKK_LOS[14] - P[22][6]*SH_LOS[3]*SKK_LOS[3]*SKK_LOS[14]); - varInnovOptFlow[0] = 1.0f/SK_LOS[0]; - innovOptFlow[0] = losPred[0] - losData[0]; - - // reset the observation index to 0 (we start by fusing the X - // measurement) - obsIndex = 0; - fuseOptFlowData = false; - } - else if (obsIndex == 1) // we are now fusing the Y measurement - { - // Calculate observation jacobians - for (uint8_t i = 0; i < n_states; i++) H_LOS[i] = 0; - H_LOS[0] = SH_LOS[1]*SH_LOS[3]*(2*a1*q1 - 2*q0 + 2*a2*q2) + SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[6] - ve*SH_LOS[11] + vn*SH_LOS[5]); - H_LOS[1] = SH_LOS[1]*SH_LOS[3]*(2*q1 + 2*a1*q0 - 2*a2*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[11] + ve*SH_LOS[6] + vn*SH_LOS[4]); - H_LOS[2] = SH_LOS[1]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[0]*SH_LOS[3]*(vd*SH_LOS[5] + ve*SH_LOS[4] - vn*SH_LOS[6]); - H_LOS[3] = SH_LOS[0]*SH_LOS[3]*(ve*SH_LOS[5] - vd*SH_LOS[4] + vn*SH_LOS[11]) - SH_LOS[1]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1); - H_LOS[4] = SH_LOS[0]*SH_LOS[3]*(a2*(2*q0*q2 + 2*q1*q3) + a3*(2*q0*q3 - 2*q1*q2) - sq(q0) - sq(q1) + sq(q2) + sq(q3)); - H_LOS[5] = -SH_LOS[0]*SH_LOS[3]*(a3*(sq(q0) - sq(q1) + sq(q2) - sq(q3)) + 2*q0*q3 + 2*q1*q2 + a2*(2*q0*q1 - 2*q2*q3)); - H_LOS[6] = SH_LOS[0]*SH_LOS[3]*(a2*(sq(q0) - sq(q1) - sq(q2) + sq(q3)) + 2*q0*q2 - 2*q1*q3 - a3*(2*q0*q1 + 2*q2*q3)); - H_LOS[9] = -SH_LOS[0]*SH_LOS[1]*SH_LOS[7]; - H_LOS[22] = SH_LOS[0]*SH_LOS[1]*SH_LOS[7]; - - // Calculate Kalman gains - SK_LOS[1] = 1/(R_LOS + SKK_LOS[12]*(P[0][2]*SKK_LOS[10] + P[1][2]*SKK_LOS[11] + P[2][2]*SKK_LOS[12] - P[3][2]*SKK_LOS[13] - P[9][2]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][2]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][2]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][2]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][2]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) - SKK_LOS[13]*(P[0][3]*SKK_LOS[10] + P[1][3]*SKK_LOS[11] + P[2][3]*SKK_LOS[12] - P[3][3]*SKK_LOS[13] - P[9][3]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][3]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][3]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][3]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][3]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SKK_LOS[10]*(P[0][0]*SKK_LOS[10] + P[1][0]*SKK_LOS[11] + P[2][0]*(SH_LOS[1]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[3]*SKK_LOS[14]*(vd*SH_LOS[5] + ve*SH_LOS[4] - vn*SH_LOS[6])) - P[3][0]*(SH_LOS[1]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) - SH_LOS[3]*SKK_LOS[14]*(ve*SH_LOS[5] - vd*SH_LOS[4] + vn*SH_LOS[11])) - P[9][0]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][0]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][0]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][0]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][0]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SKK_LOS[11]*(P[0][1]*SKK_LOS[10] + P[1][1]*SKK_LOS[11] + P[2][1]*(SH_LOS[1]*SH_LOS[3]*(2*q2 + 2*a2*q0 + 2*a1*q3) - SH_LOS[3]*SKK_LOS[14]*(vd*SH_LOS[5] + ve*SH_LOS[4] - vn*SH_LOS[6])) - P[3][1]*(SH_LOS[1]*SH_LOS[3]*(2*q3 - 2*a1*q2 + 2*a2*q1) - SH_LOS[3]*SKK_LOS[14]*(ve*SH_LOS[5] - vd*SH_LOS[4] + vn*SH_LOS[11])) - P[9][1]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][1]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][1]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][1]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][1]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) - SH_LOS[1]*SH_LOS[7]*SKK_LOS[14]*(P[0][9]*SKK_LOS[10] + P[1][9]*SKK_LOS[11] + P[2][9]*SKK_LOS[12] - P[3][9]*SKK_LOS[13] - P[9][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][9]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][9]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][9]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SH_LOS[1]*SH_LOS[7]*SKK_LOS[14]*(P[0][22]*SKK_LOS[10] + P[1][22]*SKK_LOS[11] + P[2][22]*SKK_LOS[12] - P[3][22]*SKK_LOS[13] - P[9][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][22]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][22]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][22]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14]*(P[0][4]*SKK_LOS[10] + P[1][4]*SKK_LOS[11] + P[2][4]*SKK_LOS[12] - P[3][4]*SKK_LOS[13] - P[9][4]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][4]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][4]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][4]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) - SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]*(P[0][5]*SKK_LOS[10] + P[1][5]*SKK_LOS[11] + P[2][5]*SKK_LOS[12] - P[3][5]*SKK_LOS[13] - P[9][5]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][5]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][5]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][5]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]) + SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14]*(P[0][6]*SKK_LOS[10] + P[1][6]*SKK_LOS[11] + P[2][6]*SKK_LOS[12] - P[3][6]*SKK_LOS[13] - P[9][6]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][6]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][6]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][6]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14] + P[6][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14])); - Kfusion[0] = SK_LOS[1]*(P[0][0]*SKK_LOS[10] - P[0][3]*SKK_LOS[13] + P[0][1]*SKK_LOS[11] + P[0][2]*SKK_LOS[12] - P[0][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[0][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[0][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[0][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[0][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[1] = SK_LOS[1]*(P[1][0]*SKK_LOS[10] - P[1][3]*SKK_LOS[13] + P[1][1]*SKK_LOS[11] + P[1][2]*SKK_LOS[12] - P[1][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[1][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[1][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[1][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[1][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[2] = SK_LOS[1]*(P[2][0]*SKK_LOS[10] - P[2][3]*SKK_LOS[13] + P[2][1]*SKK_LOS[11] + P[2][2]*SKK_LOS[12] - P[2][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[2][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[2][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[2][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[2][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[3] = SK_LOS[1]*(P[3][0]*SKK_LOS[10] - P[3][3]*SKK_LOS[13] + P[3][1]*SKK_LOS[11] + P[3][2]*SKK_LOS[12] - P[3][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[3][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[3][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[3][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[3][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[4] = SK_LOS[1]*(P[4][0]*SKK_LOS[10] - P[4][3]*SKK_LOS[13] + P[4][1]*SKK_LOS[11] + P[4][2]*SKK_LOS[12] - P[4][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[4][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[4][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[4][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[5] = SK_LOS[1]*(P[5][0]*SKK_LOS[10] - P[5][3]*SKK_LOS[13] + P[5][1]*SKK_LOS[11] + P[5][2]*SKK_LOS[12] - P[5][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[5][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[5][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[5][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[5][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[6] = SK_LOS[1]*(P[6][0]*SKK_LOS[10] - P[6][3]*SKK_LOS[13] + P[6][1]*SKK_LOS[11] + P[6][2]*SKK_LOS[12] - P[6][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[6][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[6][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[6][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[6][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[7] = SK_LOS[1]*(P[7][0]*SKK_LOS[10] - P[7][3]*SKK_LOS[13] + P[7][1]*SKK_LOS[11] + P[7][2]*SKK_LOS[12] - P[7][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[7][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[7][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[7][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[7][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[8] = SK_LOS[1]*(P[8][0]*SKK_LOS[10] - P[8][3]*SKK_LOS[13] + P[8][1]*SKK_LOS[11] + P[8][2]*SKK_LOS[12] - P[8][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[8][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[8][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[8][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[8][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[9] = SK_LOS[1]*(P[9][0]*SKK_LOS[10] - P[9][3]*SKK_LOS[13] + P[9][1]*SKK_LOS[11] + P[9][2]*SKK_LOS[12] - P[9][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[9][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[9][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[9][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[9][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[10] = SK_LOS[1]*(P[10][0]*SKK_LOS[10] - P[10][3]*SKK_LOS[13] + P[10][1]*SKK_LOS[11] + P[10][2]*SKK_LOS[12] - P[10][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[10][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[10][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[10][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[10][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[11] = SK_LOS[1]*(P[11][0]*SKK_LOS[10] - P[11][3]*SKK_LOS[13] + P[11][1]*SKK_LOS[11] + P[11][2]*SKK_LOS[12] - P[11][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[11][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[11][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[11][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[11][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[12] = SK_LOS[1]*(P[12][0]*SKK_LOS[10] - P[12][3]*SKK_LOS[13] + P[12][1]*SKK_LOS[11] + P[12][2]*SKK_LOS[12] - P[12][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[12][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[12][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[12][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[12][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[13] = 0.0f;//SK_LOS[1]*(P[13][0]*SKK_LOS[10] - P[13][3]*SKK_LOS[13] + P[13][1]*SKK_LOS[11] + P[13][2]*SKK_LOS[12] - P[13][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[13][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[13][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[13][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[13][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[14] = SK_LOS[1]*(P[14][0]*SKK_LOS[10] - P[14][3]*SKK_LOS[13] + P[14][1]*SKK_LOS[11] + P[14][2]*SKK_LOS[12] - P[14][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[14][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[14][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[14][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[14][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[15] = SK_LOS[1]*(P[15][0]*SKK_LOS[10] - P[15][3]*SKK_LOS[13] + P[15][1]*SKK_LOS[11] + P[15][2]*SKK_LOS[12] - P[15][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[15][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[15][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[15][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[15][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[16] = SK_LOS[1]*(P[16][0]*SKK_LOS[10] - P[16][3]*SKK_LOS[13] + P[16][1]*SKK_LOS[11] + P[16][2]*SKK_LOS[12] - P[16][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[16][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[16][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[16][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[16][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[17] = SK_LOS[1]*(P[17][0]*SKK_LOS[10] - P[17][3]*SKK_LOS[13] + P[17][1]*SKK_LOS[11] + P[17][2]*SKK_LOS[12] - P[17][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[17][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[17][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[17][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[17][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[18] = SK_LOS[1]*(P[18][0]*SKK_LOS[10] - P[18][3]*SKK_LOS[13] + P[18][1]*SKK_LOS[11] + P[18][2]*SKK_LOS[12] - P[18][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[18][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[18][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[18][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[18][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[19] = SK_LOS[1]*(P[19][0]*SKK_LOS[10] - P[19][3]*SKK_LOS[13] + P[19][1]*SKK_LOS[11] + P[19][2]*SKK_LOS[12] - P[19][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[19][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[19][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[19][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[19][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[20] = SK_LOS[1]*(P[20][0]*SKK_LOS[10] - P[20][3]*SKK_LOS[13] + P[20][1]*SKK_LOS[11] + P[20][2]*SKK_LOS[12] - P[20][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[20][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[20][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[20][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[20][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[21] = SK_LOS[1]*(P[21][0]*SKK_LOS[10] - P[21][3]*SKK_LOS[13] + P[21][1]*SKK_LOS[11] + P[21][2]*SKK_LOS[12] - P[21][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[21][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[21][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[21][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[21][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - Kfusion[22] = SK_LOS[1]*(P[22][0]*SKK_LOS[10] - P[22][3]*SKK_LOS[13] + P[22][1]*SKK_LOS[11] + P[22][2]*SKK_LOS[12] - P[22][9]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][22]*SH_LOS[1]*SH_LOS[7]*SKK_LOS[14] + P[22][6]*SH_LOS[3]*SKK_LOS[0]*SKK_LOS[14] + P[22][4]*SH_LOS[3]*SKK_LOS[2]*SKK_LOS[14] - P[22][5]*SH_LOS[3]*SKK_LOS[1]*SKK_LOS[14]); - varInnovOptFlow[1] = 1.0f/SK_LOS[1]; - innovOptFlow[1] = losPred[1] - losData[1]; - } + // estimate range to centre of image + range = (flowStates[1] - statesAtRngTime[9]) * SK_RNG[2]; - // Check the innovation for consistency and don't fuse if > 3Sigma - if ((innovOptFlow[obsIndex]*innovOptFlow[obsIndex]/varInnovOptFlow[obsIndex]) < 9.0f) - { - // correct the state vector - for (uint8_t j = 0; j < n_states; j++) - { - states[j] = states[j] - Kfusion[j] * innovOptFlow[obsIndex]; - } - // normalise the quaternion states - float quatMag = sqrt(states[0]*states[0] + states[1]*states[1] + states[2]*states[2] + states[3]*states[3]); - if (quatMag > 1e-12f) - { - for (uint8_t j= 0; j<=3; j++) - { - float quatMagInv = 1.0f/quatMag; - states[j] = states[j] * quatMagInv; - } - } - // correct the covariance P = (I - K*H)*P - // take advantage of the empty columns in KH to reduce the - // number of operations - for (uint8_t i = 0; i < n_states; i++) - { - for (uint8_t j = 0; j <= 6; j++) - { - KH[i][j] = Kfusion[i] * H_LOS[j]; - } - for (uint8_t j = 7; j <= 8; j++) - { - KH[i][j] = 0.0f; - } - KH[i][9] = Kfusion[i] * H_LOS[9]; - for (uint8_t j = 10; j <= 21; j++) - { - KH[i][j] = 0.0f; - } - KH[i][22] = Kfusion[i] * H_LOS[22]; - } - for (uint8_t i = 0; i < n_states; i++) - { - for (uint8_t j = 0; j < n_states; j++) - { - KHP[i][j] = 0.0f; - for (uint8_t k = 0; k <= 6; k++) - { - KHP[i][j] = KHP[i][j] + KH[i][k] * P[k][j]; - } - KHP[i][j] = KHP[i][j] + KH[i][9] * P[9][j]; - KHP[i][j] = KHP[i][j] + KH[i][22] * P[2][j]; - } - } - } - for (uint8_t i = 0; i < n_states; i++) + // Calculate the measurement innovation + innovRng = range - rngMea; + + // calculate the innovation consistency test ratio + auxRngTestRatio = sq(innovRng) / (sq(rngInnovGate) * varInnovRng); + + // Check the innovation for consistency and don't fuse if out of bounds + if (auxRngTestRatio < 1.0f) { - for (uint8_t j = 0; j < n_states; j++) - { - P[i][j] = P[i][j] - KHP[i][j]; + // correct the state + for (uint8_t i = 0; i < 2 ; i++) { + flowStates[i] -= K_RNG[i] * innovRng; } + // constrain the states + + // constrain focal length to 0.1 to 10 mm + flowStates[0] = ConstrainFloat(flowStates[0], 0.1f, 10.0f); + // constrain altitude + flowStates[1] = maxf(flowStates[1], statesAtRngTime[9] + minFlowRng); + + // correct the covariance matrix + float nextPopt[2][2]; + nextPopt[0][0] = Popt[0][0] - (Popt[0][1]*Popt[1][0]*SK_RNG[1]*SK_RNG[2]) * SK_RNG[2]; + nextPopt[0][1] = Popt[0][1] - (Popt[0][1]*Popt[1][1]*SK_RNG[1]*SK_RNG[2]) * SK_RNG[2]; + nextPopt[1][0] = -Popt[1][0]*((Popt[1][1]*SK_RNG[1]*SK_RNG[2]) * SK_RNG[2] - 1.0f); + nextPopt[1][1] = -Popt[1][1]*((Popt[1][1]*SK_RNG[1]*SK_RNG[2]) * SK_RNG[2] - 1.0f); + // prevent the state variances from becoming negative and maintain symmetry + Popt[0][0] = maxf(nextPopt[0][0],0.0f); + Popt[1][1] = maxf(nextPopt[1][1],0.0f); + Popt[0][1] = 0.5f * (nextPopt[0][1] + nextPopt[1][0]); + Popt[1][0] = Popt[0][1]; } } - obsIndex = obsIndex + 1; - ForceSymmetry(); - ConstrainVariances(); } void AttPosEKF::zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last) @@ -2126,6 +2304,24 @@ float AttPosEKF::sq(float valIn) return valIn*valIn; } +float AttPosEKF::maxf(float valIn1, float valIn2) +{ + if (valIn1 >= valIn2) { + return valIn1; + } else { + return valIn2; + } +} + +float AttPosEKF::min(float valIn1, float valIn2) +{ + if (valIn1 <= valIn2) { + return valIn1; + } else { + return valIn2; + } +} + // Store states in a history array along with time stamp void AttPosEKF::StoreStates(uint64_t timestamp_ms) { @@ -2322,9 +2518,9 @@ void AttPosEKF::OnGroundCheck() } // don't update terrain offset state if on ground if (onGround) { - inhibitGndHgtState = true; + inhibitGndState = true; } else { - inhibitGndHgtState = false; + inhibitGndState = false; } } @@ -3006,9 +3202,14 @@ void AttPosEKF::ZeroVariables() { // Initialize on-init initialized variables - + dtIMUfilt = ConstrainFloat(dtIMU, 0.001f, 0.02f); + dtVelPosFilt = ConstrainFloat(dtVelPos, 0.04f, 0.5f); + dtGpsFilt = 1.0f / 5.0f; + dtHgtFilt = 1.0f / 100.0f; storeIndex = 0; + lastVelPosFusion = millis(); + // Do the data structure init for (unsigned i = 0; i < n_states; i++) { for (unsigned j = 0; j < n_states; j++) { @@ -3028,6 +3229,13 @@ void AttPosEKF::ZeroVariables() dVelIMU.zero(); lastGyroOffset.zero(); + windSpdFiltNorth = 0.0f; + windSpdFiltEast = 0.0f; + // setting the altitude to zero will give us a higher + // gain to adjust faster in the first step + windSpdFiltAltitude = 0.0f; + windSpdFiltClimb = 0.0f; + for (unsigned i = 0; i < data_buffer_size; i++) { for (unsigned j = 0; j < n_states; j++) { diff --git a/src/modules/ekf_att_pos_estimator/estimator_23states.h b/src/modules/ekf_att_pos_estimator/estimator_23states.h index faa6735ca..a607955a8 100644 --- a/src/modules/ekf_att_pos_estimator/estimator_23states.h +++ b/src/modules/ekf_att_pos_estimator/estimator_23states.h @@ -80,6 +80,14 @@ public: airspeedMeasurementSigma = 1.4f; gyroProcessNoise = 1.4544411e-2f; accelProcessNoise = 0.5f; + + gndHgtSigma = 0.1f; // terrain gradient 1-sigma + R_LOS = 0.03f; // optical flow measurement noise variance (rad/sec)^2 + flowInnovGate = 3.0f; // number of standard deviations applied to the optical flow innovation consistency check + auxFlowInnovGate = 10.0f; // number of standard deviations applied to the optical flow innovation consistency check used by the auxiliary filter + rngInnovGate = 10.0f; // number of standard deviations applied to the rnage finder innovation consistency check + minFlowRng = 0.01f; //minimum range between ground and flow sensor + moCompR_LOS = 0.2; // scaler from sensor gyro rate to uncertainty in LOS rate } struct mag_state_struct { @@ -116,13 +124,16 @@ public: float storedStates[n_states][data_buffer_size]; // state vectors stored for the last 50 time steps uint32_t statetimeStamp[data_buffer_size]; // time stamp for each state vector stored + // Times + uint64_t lastVelPosFusion; // the time of the last velocity fusion, in the standard time unit of the filter + float statesAtVelTime[n_states]; // States at the effective measurement time for posNE and velNED measurements float statesAtPosTime[n_states]; // States at the effective measurement time for posNE and velNED measurements float statesAtHgtTime[n_states]; // States at the effective measurement time for the hgtMea measurement float statesAtMagMeasTime[n_states]; // filter satates at the effective measurement time float statesAtVtasMeasTime[n_states]; // filter states at the effective measurement time float statesAtRngTime[n_states]; // filter states at the effective measurement time - float statesAtOptFlowTime[n_states]; // States at the effective optical flow measurement time + float statesAtFlowTime[n_states]; // States at the effective optical flow measurement time Vector3f correctedDelAng; // delta angles about the xyz body axes corrected for errors (rad) Vector3f correctedDelVel; // delta velocities along the XYZ body axes corrected for errors (m/s) @@ -140,7 +151,16 @@ public: Vector3f accel; // acceleration vector in XYZ body axes measured by the IMU (m/s^2) Vector3f dVelIMU; Vector3f dAngIMU; - float dtIMU; // time lapsed since the last IMU measurement or covariance update (sec) + float dtIMU; // time lapsed since the last IMU measurement or covariance update (sec), this may have significant jitter + float dtIMUfilt; // average time between IMU measurements (sec) + float dtVelPos; // time lapsed since the last position / velocity fusion (seconds), this may have significant jitter + float dtVelPosFilt; // average time between position / velocity fusion steps + float dtHgtFilt; // average time between height measurement updates + float dtGpsFilt; // average time between gps measurement updates + float windSpdFiltNorth; // average wind speed north component + float windSpdFiltEast; // average wind speed east component + float windSpdFiltAltitude; // the last altitude used to filter wind speed + float windSpdFiltClimb; // filtered climb rate uint8_t fusionModeGPS; // 0 = GPS outputs 3D velocity, 1 = GPS outputs 2D velocity, 2 = GPS outputs no velocity float innovVelPos[6]; // innovation output float varInnovVelPos[6]; // innovation variance output @@ -192,7 +212,8 @@ public: bool inhibitWindStates; // true when wind states and covariances are to remain constant bool inhibitMagStates; // true when magnetic field states and covariances are to remain constant - bool inhibitGndHgtState; // true when the terrain ground height offset state and covariances are to remain constant + bool inhibitGndState; // true when the terrain ground height offset state and covariances are to remain constant + bool inhibitScaleState; // true when the focal length scale factor state and covariances are to remain constant bool onGround; ///< boolean true when the flight vehicle is on the ground (not flying) bool staticMode; ///< boolean true if no position feedback is fused @@ -211,6 +232,30 @@ public: unsigned storeIndex; + // Optical Flow error estimation + float storedOmega[3][data_buffer_size]; // angular rate vector stored for the last 50 time steps used by optical flow eror estimators + + // Two state EKF used to estimate focal length scale factor and terrain position + float Popt[2][2]; // state covariance matrix + float flowStates[2]; // flow states [scale factor, terrain position] + float prevPosN; // north position at last measurement + float prevPosE; // east position at last measurement + float auxFlowObsInnov[2]; // optical flow observation innovations from focal length scale factor estimator + float auxFlowObsInnovVar[2]; // innovation variance for optical flow observations from focal length scale factor estimator + float fScaleFactorVar; // optical flow sensor focal length scale factor variance + Mat3f Tnb_flow; // Transformation matrix from nav to body at the time fo the optical flow measurement + float R_LOS; // Optical flow observation noise variance (rad/sec)^2 + float auxFlowTestRatio[2]; // ratio of X and Y flow observation innovations to fault threshold + float auxRngTestRatio; // ratio of range observation innovations to fault threshold + float flowInnovGate; // number of standard deviations used for the innovation consistency check + float auxFlowInnovGate; // number of standard deviations applied to the optical flow innovation consistency check + float rngInnovGate; // number of standard deviations used for the innovation consistency check + float minFlowRng; // minimum range over which to fuse optical flow measurements + float moCompR_LOS; // scaler from sensor gyro rate to uncertainty in LOS rate + +void updateDtGpsFilt(float dt); + +void updateDtHgtFilt(float dt); void UpdateStrapdownEquationsNED(); @@ -226,6 +271,8 @@ void FuseRangeFinder(); void FuseOptFlow(); +void GroundEKF(); + void zeroRows(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last); void zeroCols(float (&covMat)[n_states][n_states], uint8_t first, uint8_t last); @@ -268,6 +315,10 @@ static void quat2Tnb(Mat3f &Tnb, const float (&quat)[4]); static float sq(float valIn); +static float maxf(float valIn1, float valIn2); + +static float min(float valIn1, float valIn2); + void OnGroundCheck(); void CovarianceInit(); @@ -300,6 +351,8 @@ void InitializeDynamic(float (&initvelNED)[3], float declination); protected: +void updateDtVelPosFilt(float dt); + bool FilterHealthy(); bool GyroOffsetsDiverged(); @@ -314,3 +367,5 @@ void AttitudeInit(float ax, float ay, float az, float mx, float my, float mz, fl uint32_t millis(); +uint64_t getMicros(); + diff --git a/src/modules/fw_att_control/fw_att_control_main.cpp b/src/modules/fw_att_control/fw_att_control_main.cpp index ad873203e..c60d8d348 100644 --- a/src/modules/fw_att_control/fw_att_control_main.cpp +++ b/src/modules/fw_att_control/fw_att_control_main.cpp @@ -63,6 +63,7 @@ #include <uORB/topics/vehicle_control_mode.h> #include <uORB/topics/parameter_update.h> #include <uORB/topics/vehicle_global_position.h> +#include <uORB/topics/vehicle_status.h> #include <systemlib/param/param.h> #include <systemlib/err.h> #include <systemlib/pid/pid.h> @@ -124,6 +125,7 @@ private: int _params_sub; /**< notification of parameter updates */ int _manual_sub; /**< notification of manual control updates */ int _global_pos_sub; /**< global position subscription */ + int _vehicle_status_sub; /**< vehicle status subscription */ orb_advert_t _rate_sp_pub; /**< rate setpoint publication */ orb_advert_t _attitude_sp_pub; /**< attitude setpoint point */ @@ -139,6 +141,7 @@ private: struct actuator_controls_s _actuators; /**< actuator control inputs */ struct actuator_controls_s _actuators_airframe; /**< actuator control inputs */ struct vehicle_global_position_s _global_pos; /**< global position */ + struct vehicle_status_s _vehicle_status; /**< vehicle status */ perf_counter_t _loop_perf; /**< loop performance counter */ perf_counter_t _nonfinite_input_perf; /**< performance counter for non finite input */ @@ -276,6 +279,11 @@ private: void global_pos_poll(); /** + * Check for vehicle status updates. + */ + void vehicle_status_poll(); + + /** * Shim for calling task_main from task_create. */ static void task_main_trampoline(int argc, char *argv[]); @@ -313,6 +321,7 @@ FixedwingAttitudeControl::FixedwingAttitudeControl() : _params_sub(-1), _manual_sub(-1), _global_pos_sub(-1), + _vehicle_status_sub(-1), /* publications */ _rate_sp_pub(-1), @@ -338,6 +347,7 @@ FixedwingAttitudeControl::FixedwingAttitudeControl() : _actuators = {}; _actuators_airframe = {}; _global_pos = {}; + _vehicle_status = {}; _parameter_handles.tconst = param_find("FW_ATT_TC"); @@ -561,6 +571,18 @@ FixedwingAttitudeControl::global_pos_poll() } void +FixedwingAttitudeControl::vehicle_status_poll() +{ + /* check if there is new status information */ + bool vehicle_status_updated; + orb_check(_vehicle_status_sub, &vehicle_status_updated); + + if (vehicle_status_updated) { + orb_copy(ORB_ID(vehicle_status), _vehicle_status_sub, &_vehicle_status); + } +} + +void FixedwingAttitudeControl::task_main_trampoline(int argc, char *argv[]) { att_control::g_control->task_main(); @@ -585,6 +607,7 @@ FixedwingAttitudeControl::task_main() _params_sub = orb_subscribe(ORB_ID(parameter_update)); _manual_sub = orb_subscribe(ORB_ID(manual_control_setpoint)); _global_pos_sub = orb_subscribe(ORB_ID(vehicle_global_position)); + _vehicle_status_sub = orb_subscribe(ORB_ID(vehicle_status)); /* rate limit vehicle status updates to 5Hz */ orb_set_interval(_vcontrol_mode_sub, 200); @@ -599,6 +622,7 @@ FixedwingAttitudeControl::task_main() vehicle_accel_poll(); vehicle_control_mode_poll(); vehicle_manual_poll(); + vehicle_status_poll(); /* wakeup source(s) */ struct pollfd fds[2]; @@ -667,6 +691,8 @@ FixedwingAttitudeControl::task_main() global_pos_poll(); + vehicle_status_poll(); + /* lock integrator until control is started */ bool lock_integrator; @@ -779,6 +805,13 @@ FixedwingAttitudeControl::task_main() } } + /* If the aircraft is on ground reset the integrators */ + if (_vehicle_status.condition_landed) { + _roll_ctrl.reset_integrator(); + _pitch_ctrl.reset_integrator(); + _yaw_ctrl.reset_integrator(); + } + /* Prepare speed_body_u and speed_body_w */ float speed_body_u = 0.0f; float speed_body_v = 0.0f; diff --git a/src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp b/src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp index 81e25da99..23167eef4 100644 --- a/src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp +++ b/src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp @@ -211,6 +211,7 @@ private: float max_climb_rate; float climbout_diff; float heightrate_p; + float heightrate_ff; float speedrate_p; float throttle_damp; float integrator_gain; @@ -256,6 +257,7 @@ private: param_t max_climb_rate; param_t climbout_diff; param_t heightrate_p; + param_t heightrate_ff; param_t speedrate_p; param_t throttle_damp; param_t integrator_gain; @@ -495,6 +497,7 @@ FixedwingPositionControl::FixedwingPositionControl() : _parameter_handles.speed_weight = param_find("FW_T_SPDWEIGHT"); _parameter_handles.pitch_damping = param_find("FW_T_PTCH_DAMP"); _parameter_handles.heightrate_p = param_find("FW_T_HRATE_P"); + _parameter_handles.heightrate_ff = param_find("FW_T_HRATE_FF"); _parameter_handles.speedrate_p = param_find("FW_T_SRATE_P"); /* fetch initial parameter values */ @@ -564,6 +567,7 @@ FixedwingPositionControl::parameters_update() param_get(_parameter_handles.climbout_diff, &(_parameters.climbout_diff)); param_get(_parameter_handles.heightrate_p, &(_parameters.heightrate_p)); + param_get(_parameter_handles.heightrate_ff, &(_parameters.heightrate_ff)); param_get(_parameter_handles.speedrate_p, &(_parameters.speedrate_p)); param_get(_parameter_handles.land_slope_angle, &(_parameters.land_slope_angle)); @@ -601,6 +605,7 @@ FixedwingPositionControl::parameters_update() _tecs.set_indicated_airspeed_max(_parameters.airspeed_max); _tecs.set_max_climb_rate(_parameters.max_climb_rate); _tecs.set_heightrate_p(_parameters.heightrate_p); + _tecs.set_heightrate_ff(_parameters.heightrate_ff); _tecs.set_speedrate_p(_parameters.speedrate_p); /* sanity check parameters */ diff --git a/src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c b/src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c index 890ab3bad..847ecbb5c 100644 --- a/src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c +++ b/src/modules/fw_pos_control_l1/fw_pos_control_l1_params.c @@ -131,8 +131,8 @@ PARAM_DEFINE_FLOAT(FW_R_LIM, 45.0f); /** * Throttle limit max * - * This is the maximum throttle % that can be used by the controller. - * For overpowered aircraft, this should be reduced to a value that + * This is the maximum throttle % that can be used by the controller. + * For overpowered aircraft, this should be reduced to a value that * provides sufficient thrust to climb at the maximum pitch angle PTCH_MAX. * * @group L1 Control @@ -142,10 +142,10 @@ PARAM_DEFINE_FLOAT(FW_THR_MAX, 1.0f); /** * Throttle limit min * - * This is the minimum throttle % that can be used by the controller. - * For electric aircraft this will normally be set to zero, but can be set - * to a small non-zero value if a folding prop is fitted to prevent the - * prop from folding and unfolding repeatedly in-flight or to provide + * This is the minimum throttle % that can be used by the controller. + * For electric aircraft this will normally be set to zero, but can be set + * to a small non-zero value if a folding prop is fitted to prevent the + * prop from folding and unfolding repeatedly in-flight or to provide * some aerodynamic drag from a turning prop to improve the descent rate. * * For aircraft with internal combustion engine this parameter should be set @@ -158,7 +158,7 @@ PARAM_DEFINE_FLOAT(FW_THR_MIN, 0.0f); /** * Throttle limit value before flare * - * This throttle value will be set as throttle limit at FW_LND_TLALT, + * This throttle value will be set as throttle limit at FW_LND_TLALT, * before arcraft will flare. * * @group L1 Control @@ -180,17 +180,17 @@ PARAM_DEFINE_FLOAT(FW_CLMBOUT_DIFF, 25.0f); /** * Maximum climb rate * - * This is the best climb rate that the aircraft can achieve with - * the throttle set to THR_MAX and the airspeed set to the - * default value. For electric aircraft make sure this number can be - * achieved towards the end of flight when the battery voltage has reduced. - * The setting of this parameter can be checked by commanding a positive - * altitude change of 100m in loiter, RTL or guided mode. If the throttle - * required to climb is close to THR_MAX and the aircraft is maintaining - * airspeed, then this parameter is set correctly. If the airspeed starts - * to reduce, then the parameter is set to high, and if the throttle - * demand required to climb and maintain speed is noticeably less than - * FW_THR_MAX, then either FW_T_CLMB_MAX should be increased or + * This is the best climb rate that the aircraft can achieve with + * the throttle set to THR_MAX and the airspeed set to the + * default value. For electric aircraft make sure this number can be + * achieved towards the end of flight when the battery voltage has reduced. + * The setting of this parameter can be checked by commanding a positive + * altitude change of 100m in loiter, RTL or guided mode. If the throttle + * required to climb is close to THR_MAX and the aircraft is maintaining + * airspeed, then this parameter is set correctly. If the airspeed starts + * to reduce, then the parameter is set to high, and if the throttle + * demand required to climb and maintain speed is noticeably less than + * FW_THR_MAX, then either FW_T_CLMB_MAX should be increased or * FW_THR_MAX reduced. * * @group L1 Control @@ -200,8 +200,8 @@ PARAM_DEFINE_FLOAT(FW_T_CLMB_MAX, 5.0f); /** * Minimum descent rate * - * This is the sink rate of the aircraft with the throttle - * set to THR_MIN and flown at the same airspeed as used + * This is the sink rate of the aircraft with the throttle + * set to THR_MIN and flown at the same airspeed as used * to measure FW_T_CLMB_MAX. * * @group Fixed Wing TECS @@ -211,10 +211,10 @@ PARAM_DEFINE_FLOAT(FW_T_SINK_MIN, 2.0f); /** * Maximum descent rate * - * This sets the maximum descent rate that the controller will use. - * If this value is too large, the aircraft can over-speed on descent. - * This should be set to a value that can be achieved without - * exceeding the lower pitch angle limit and without over-speeding + * This sets the maximum descent rate that the controller will use. + * If this value is too large, the aircraft can over-speed on descent. + * This should be set to a value that can be achieved without + * exceeding the lower pitch angle limit and without over-speeding * the aircraft. * * @group Fixed Wing TECS @@ -224,7 +224,7 @@ PARAM_DEFINE_FLOAT(FW_T_SINK_MAX, 5.0f); /** * TECS time constant * - * This is the time constant of the TECS control algorithm (in seconds). + * This is the time constant of the TECS control algorithm (in seconds). * Smaller values make it faster to respond, larger values make it slower * to respond. * @@ -235,7 +235,7 @@ PARAM_DEFINE_FLOAT(FW_T_TIME_CONST, 5.0f); /** * TECS Throttle time constant * - * This is the time constant of the TECS throttle control algorithm (in seconds). + * This is the time constant of the TECS throttle control algorithm (in seconds). * Smaller values make it faster to respond, larger values make it slower * to respond. * @@ -246,7 +246,7 @@ PARAM_DEFINE_FLOAT(FW_T_THRO_CONST, 8.0f); /** * Throttle damping factor * - * This is the damping gain for the throttle demand loop. + * This is the damping gain for the throttle demand loop. * Increase to add damping to correct for oscillations in speed and height. * * @group Fixed Wing TECS @@ -256,9 +256,9 @@ PARAM_DEFINE_FLOAT(FW_T_THR_DAMP, 0.5f); /** * Integrator gain * - * This is the integrator gain on the control loop. - * Increasing this gain increases the speed at which speed - * and height offsets are trimmed out, but reduces damping and + * This is the integrator gain on the control loop. + * Increasing this gain increases the speed at which speed + * and height offsets are trimmed out, but reduces damping and * increases overshoot. * * @group Fixed Wing TECS @@ -269,9 +269,9 @@ PARAM_DEFINE_FLOAT(FW_T_INTEG_GAIN, 0.1f); * Maximum vertical acceleration * * This is the maximum vertical acceleration (in metres/second square) - * either up or down that the controller will use to correct speed - * or height errors. The default value of 7 m/s/s (equivalent to +- 0.7 g) - * allows for reasonably aggressive pitch changes if required to recover + * either up or down that the controller will use to correct speed + * or height errors. The default value of 7 m/s/s (equivalent to +- 0.7 g) + * allows for reasonably aggressive pitch changes if required to recover * from under-speed conditions. * * @group Fixed Wing TECS @@ -281,10 +281,10 @@ PARAM_DEFINE_FLOAT(FW_T_VERT_ACC, 7.0f); /** * Complementary filter "omega" parameter for height * - * This is the cross-over frequency (in radians/second) of the complementary - * filter used to fuse vertical acceleration and barometric height to obtain - * an estimate of height rate and height. Increasing this frequency weights - * the solution more towards use of the barometer, whilst reducing it weights + * This is the cross-over frequency (in radians/second) of the complementary + * filter used to fuse vertical acceleration and barometric height to obtain + * an estimate of height rate and height. Increasing this frequency weights + * the solution more towards use of the barometer, whilst reducing it weights * the solution more towards use of the accelerometer data. * * @group Fixed Wing TECS @@ -294,10 +294,10 @@ PARAM_DEFINE_FLOAT(FW_T_HGT_OMEGA, 3.0f); /** * Complementary filter "omega" parameter for speed * - * This is the cross-over frequency (in radians/second) of the complementary - * filter used to fuse longitudinal acceleration and airspeed to obtain an + * This is the cross-over frequency (in radians/second) of the complementary + * filter used to fuse longitudinal acceleration and airspeed to obtain an * improved airspeed estimate. Increasing this frequency weights the solution - * more towards use of the arispeed sensor, whilst reducing it weights the + * more towards use of the arispeed sensor, whilst reducing it weights the * solution more towards use of the accelerometer data. * * @group Fixed Wing TECS @@ -307,13 +307,13 @@ PARAM_DEFINE_FLOAT(FW_T_SPD_OMEGA, 2.0f); /** * Roll -> Throttle feedforward * - * Increasing this gain turn increases the amount of throttle that will - * be used to compensate for the additional drag created by turning. - * Ideally this should be set to approximately 10 x the extra sink rate - * in m/s created by a 45 degree bank turn. Increase this gain if - * the aircraft initially loses energy in turns and reduce if the - * aircraft initially gains energy in turns. Efficient high aspect-ratio - * aircraft (eg powered sailplanes) can use a lower value, whereas + * Increasing this gain turn increases the amount of throttle that will + * be used to compensate for the additional drag created by turning. + * Ideally this should be set to approximately 10 x the extra sink rate + * in m/s created by a 45 degree bank turn. Increase this gain if + * the aircraft initially loses energy in turns and reduce if the + * aircraft initially gains energy in turns. Efficient high aspect-ratio + * aircraft (eg powered sailplanes) can use a lower value, whereas * inefficient low aspect-ratio models (eg delta wings) can use a higher value. * * @group Fixed Wing TECS @@ -323,15 +323,15 @@ PARAM_DEFINE_FLOAT(FW_T_RLL2THR, 10.0f); /** * Speed <--> Altitude priority * - * This parameter adjusts the amount of weighting that the pitch control - * applies to speed vs height errors. Setting it to 0.0 will cause the - * pitch control to control height and ignore speed errors. This will - * normally improve height accuracy but give larger airspeed errors. - * Setting it to 2.0 will cause the pitch control loop to control speed - * and ignore height errors. This will normally reduce airspeed errors, - * but give larger height errors. The default value of 1.0 allows the pitch - * control to simultaneously control height and speed. - * Note to Glider Pilots - set this parameter to 2.0 (The glider will + * This parameter adjusts the amount of weighting that the pitch control + * applies to speed vs height errors. Setting it to 0.0 will cause the + * pitch control to control height and ignore speed errors. This will + * normally improve height accuracy but give larger airspeed errors. + * Setting it to 2.0 will cause the pitch control loop to control speed + * and ignore height errors. This will normally reduce airspeed errors, + * but give larger height errors. The default value of 1.0 allows the pitch + * control to simultaneously control height and speed. + * Note to Glider Pilots - set this parameter to 2.0 (The glider will * adjust its pitch angle to maintain airspeed, ignoring changes in height). * * @group Fixed Wing TECS @@ -341,9 +341,9 @@ PARAM_DEFINE_FLOAT(FW_T_SPDWEIGHT, 1.0f); /** * Pitch damping factor * - * This is the damping gain for the pitch demand loop. Increase to add - * damping to correct for oscillations in height. The default value of 0.0 - * will work well provided the pitch to servo controller has been tuned + * This is the damping gain for the pitch demand loop. Increase to add + * damping to correct for oscillations in height. The default value of 0.0 + * will work well provided the pitch to servo controller has been tuned * properly. * * @group Fixed Wing TECS @@ -358,6 +358,13 @@ PARAM_DEFINE_FLOAT(FW_T_PTCH_DAMP, 0.0f); PARAM_DEFINE_FLOAT(FW_T_HRATE_P, 0.05f); /** + * Height rate FF factor + * + * @group Fixed Wing TECS + */ +PARAM_DEFINE_FLOAT(FW_T_HRATE_FF, 0.0f); + +/** * Speed rate P factor * * @group Fixed Wing TECS diff --git a/src/modules/mavlink/mavlink_bridge_header.h b/src/modules/mavlink/mavlink_bridge_header.h index 0cd08769e..00d427636 100644 --- a/src/modules/mavlink/mavlink_bridge_header.h +++ b/src/modules/mavlink/mavlink_bridge_header.h @@ -84,7 +84,7 @@ void mavlink_send_uart_bytes(mavlink_channel_t chan, const uint8_t *ch, int leng extern mavlink_status_t *mavlink_get_channel_status(uint8_t chan); extern mavlink_message_t *mavlink_get_channel_buffer(uint8_t chan); -#include <v1.0/common/mavlink.h> +#include <v1.0/pixhawk/mavlink.h> __END_DECLS diff --git a/src/modules/mavlink/mavlink_main.cpp b/src/modules/mavlink/mavlink_main.cpp index 940e64144..dd830071d 100644 --- a/src/modules/mavlink/mavlink_main.cpp +++ b/src/modules/mavlink/mavlink_main.cpp @@ -1387,23 +1387,26 @@ Mavlink::task_main(int argc, char *argv[]) configure_stream("SYS_STATUS", 1.0f); configure_stream("GPS_GLOBAL_ORIGIN", 0.5f); configure_stream("HIGHRES_IMU", 1.0f); - configure_stream("ATTITUDE", 10.0f); + configure_stream("ATTITUDE", 15.0f); configure_stream("VFR_HUD", 8.0f); configure_stream("GPS_RAW_INT", 1.0f); configure_stream("GLOBAL_POSITION_INT", 3.0f); configure_stream("LOCAL_POSITION_NED", 3.0f); configure_stream("RC_CHANNELS_RAW", 1.0f); configure_stream("POSITION_TARGET_GLOBAL_INT", 3.0f); - configure_stream("ATTITUDE_TARGET", 3.0f); + configure_stream("ATTITUDE_TARGET", 15.0f); configure_stream("DISTANCE_SENSOR", 0.5f); configure_stream("OPTICAL_FLOW", 20.0f); break; case MAVLINK_MODE_ONBOARD: configure_stream("SYS_STATUS", 1.0f); + // XXX OBC change back: We need to be bandwidth-efficient here too configure_stream("ATTITUDE", 50.0f); configure_stream("GLOBAL_POSITION_INT", 50.0f); configure_stream("CAMERA_CAPTURE", 2.0f); + configure_stream("ATTITUDE_TARGET", 50.0f); + configure_stream("POSITION_TARGET_GLOBAL_INT", 20.0f); break; default: diff --git a/src/modules/navigator/mission_block.cpp b/src/modules/navigator/mission_block.cpp index 4adf77dce..723caec7c 100644 --- a/src/modules/navigator/mission_block.cpp +++ b/src/modules/navigator/mission_block.cpp @@ -113,6 +113,19 @@ MissionBlock::is_mission_item_reached() if (dist >= 0.0f && dist <= _navigator->get_acceptance_radius()) { _waypoint_position_reached = true; } + } else if (!_navigator->get_vstatus()->is_rotary_wing && + (_mission_item.nav_cmd == NAV_CMD_LOITER_UNLIMITED || + _mission_item.nav_cmd == NAV_CMD_LOITER_TIME_LIMIT || + _mission_item.nav_cmd == NAV_CMD_LOITER_TURN_COUNT)) { + /* Loiter mission item on a non rotary wing: the aircraft is going to circle the + * coordinates with a radius equal to the loiter_radius field. It is not flying + * through the waypoint center. + * Therefore the item is marked as reached once the system reaches the loiter + * radius (+ some margin). Time inside and turn count is handled elsewhere. + */ + if (dist >= 0.0f && dist <= _mission_item.loiter_radius * 1.2f) { + _waypoint_position_reached = true; + } } else { /* for normal mission items used their acceptance radius */ if (dist >= 0.0f && dist <= _mission_item.acceptance_radius) { diff --git a/src/modules/sdlog2/sdlog2.c b/src/modules/sdlog2/sdlog2.c index dbda8ea6f..e13593077 100644 --- a/src/modules/sdlog2/sdlog2.c +++ b/src/modules/sdlog2/sdlog2.c @@ -1432,6 +1432,11 @@ int sdlog2_thread_main(int argc, char *argv[]) log_msg.body.log_GPOS.vel_d = buf.global_pos.vel_d; log_msg.body.log_GPOS.eph = buf.global_pos.eph; log_msg.body.log_GPOS.epv = buf.global_pos.epv; + if (buf.global_pos.terrain_alt_valid) { + log_msg.body.log_GPOS.terrain_alt = buf.global_pos.terrain_alt; + } else { + log_msg.body.log_GPOS.terrain_alt = -1.0f; + } LOGBUFFER_WRITE_AND_COUNT(GPOS); } @@ -1464,7 +1469,7 @@ int sdlog2_thread_main(int argc, char *argv[]) log_msg.body.log_VICN.yaw = buf.vicon_pos.yaw; LOGBUFFER_WRITE_AND_COUNT(VICN); } - + /* --- VISION POSITION --- */ if (copy_if_updated(ORB_ID(vision_position_estimate), subs.vision_pos_sub, &buf.vision_pos)) { log_msg.msg_type = LOG_VISN_MSG; diff --git a/src/modules/sdlog2/sdlog2_messages.h b/src/modules/sdlog2/sdlog2_messages.h index 6741c7e25..d2845eb75 100644 --- a/src/modules/sdlog2/sdlog2_messages.h +++ b/src/modules/sdlog2/sdlog2_messages.h @@ -220,6 +220,7 @@ struct log_GPOS_s { float vel_d; float eph; float epv; + float terrain_alt; }; /* --- GPSP - GLOBAL POSITION SETPOINT --- */ @@ -449,7 +450,7 @@ static const struct log_format_s log_formats[] = { LOG_FORMAT(AIRS, "fff", "IndSpeed,TrueSpeed,AirTemp"), LOG_FORMAT(ARSP, "fff", "RollRateSP,PitchRateSP,YawRateSP"), LOG_FORMAT(FLOW, "hhfffBB", "RawX,RawY,CompX,CompY,Dist,Q,SensID"), - LOG_FORMAT(GPOS, "LLffffff", "Lat,Lon,Alt,VelN,VelE,VelD,EPH,EPV"), + LOG_FORMAT(GPOS, "LLfffffff", "Lat,Lon,Alt,VelN,VelE,VelD,EPH,EPV,TALT"), LOG_FORMAT(GPSP, "BLLffBfbf", "NavState,Lat,Lon,Alt,Yaw,Type,LoitR,LoitDir,PitMin"), LOG_FORMAT(ESC, "HBBBHHHHHHfH", "count,nESC,Conn,N,Ver,Adr,Volt,Amp,RPM,Temp,SetP,SetPRAW"), LOG_FORMAT(GVSP, "fff", "VX,VY,VZ"), diff --git a/src/modules/uORB/topics/vehicle_global_position.h b/src/modules/uORB/topics/vehicle_global_position.h index 25137c1c6..c3bb3b893 100644 --- a/src/modules/uORB/topics/vehicle_global_position.h +++ b/src/modules/uORB/topics/vehicle_global_position.h @@ -72,6 +72,8 @@ struct vehicle_global_position_s { float yaw; /**< Yaw in radians -PI..+PI. */ float eph; /**< Standard deviation of position estimate horizontally */ float epv; /**< Standard deviation of position vertically */ + float terrain_alt; /**< Terrain altitude in m, WGS84 */ + bool terrain_alt_valid; /**< Terrain altitude estimate is valid */ }; /** |