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Diffstat (limited to 'src/modules/position_estimator/position_estimator_main.c')
| -rw-r--r-- | src/modules/position_estimator/position_estimator_main.c | 423 |
1 files changed, 0 insertions, 423 deletions
diff --git a/src/modules/position_estimator/position_estimator_main.c b/src/modules/position_estimator/position_estimator_main.c deleted file mode 100644 index e84945299..000000000 --- a/src/modules/position_estimator/position_estimator_main.c +++ /dev/null @@ -1,423 +0,0 @@ -/**************************************************************************** - * - * Copyright (C) 2008-2012 PX4 Development Team. All rights reserved. - * Author: Tobias Naegeli <naegelit@student.ethz.ch> - * Thomas Gubler <thomasgubler@student.ethz.ch> - * Julian Oes <joes@student.ethz.ch> - * Lorenz Meier <lm@inf.ethz.ch> - * - * 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 position_estimator_main.c - * Model-identification based position estimator for multirotors - */ - -#include <nuttx/config.h> -#include <unistd.h> -#include <stdlib.h> -#include <stdio.h> -#include <stdbool.h> -#include <fcntl.h> -#include <float.h> -#include <nuttx/sched.h> -#include <sys/prctl.h> -#include <termios.h> -#include <errno.h> -#include <limits.h> -#include <math.h> -#include <uORB/uORB.h> -#include <uORB/topics/vehicle_status.h> -#include <uORB/topics/vehicle_attitude.h> -#include <uORB/topics/vehicle_gps_position.h> -#include <uORB/topics/vehicle_global_position.h> -#include <uORB/topics/vehicle_local_position.h> -#include <poll.h> - -#define N_STATES 6 -#define ERROR_COVARIANCE_INIT 3 -#define R_EARTH 6371000.0 - -#define PROJECTION_INITIALIZE_COUNTER_LIMIT 5000 -#define REPROJECTION_COUNTER_LIMIT 125 - -__EXPORT int position_estimator_main(int argc, char *argv[]); - -static uint16_t position_estimator_counter_position_information; - -/* values for map projection */ -static double phi_1; -static double sin_phi_1; -static double cos_phi_1; -static double lambda_0; -static double scale; - -/** - * Initializes the map transformation. - * - * Initializes the transformation between the geographic coordinate system and the azimuthal equidistant plane - * @param lat in degrees (47.1234567°, not 471234567°) - * @param lon in degrees (8.1234567°, not 81234567°) - */ -static void map_projection_init(double lat_0, double lon_0) //lat_0, lon_0 are expected to be in correct format: -> 47.1234567 and not 471234567 -{ - /* notation and formulas according to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */ - phi_1 = lat_0 / 180.0 * M_PI; - lambda_0 = lon_0 / 180.0 * M_PI; - - sin_phi_1 = sin(phi_1); - cos_phi_1 = cos(phi_1); - - /* calculate local scale by using the relation of true distance and the distance on plane */ //TODO: this is a quick solution, there are probably easier ways to determine the scale - - /* 1) calculate true distance d on sphere to a point: http://www.movable-type.co.uk/scripts/latlong.html */ - const double r_earth = 6371000; - - double lat1 = phi_1; - double lon1 = lambda_0; - - double lat2 = phi_1 + 0.5 / 180 * M_PI; - double lon2 = lambda_0 + 0.5 / 180 * M_PI; - double sin_lat_2 = sin(lat2); - double cos_lat_2 = cos(lat2); - double d = acos(sin(lat1) * sin_lat_2 + cos(lat1) * cos_lat_2 * cos(lon2 - lon1)) * r_earth; - - /* 2) calculate distance rho on plane */ - double k_bar = 0; - double c = acos(sin_phi_1 * sin_lat_2 + cos_phi_1 * cos_lat_2 * cos(lon2 - lambda_0)); - - if (0 != c) - k_bar = c / sin(c); - - double x2 = k_bar * (cos_lat_2 * sin(lon2 - lambda_0)); //Projection of point 2 on plane - double y2 = k_bar * ((cos_phi_1 * sin_lat_2 - sin_phi_1 * cos_lat_2 * cos(lon2 - lambda_0))); - double rho = sqrt(pow(x2, 2) + pow(y2, 2)); - - scale = d / rho; - -} - -/** - * Transforms a point in the geographic coordinate system to the local azimuthal equidistant plane - * @param x north - * @param y east - * @param lat in degrees (47.1234567°, not 471234567°) - * @param lon in degrees (8.1234567°, not 81234567°) - */ -static void map_projection_project(double lat, double lon, float *x, float *y) -{ - /* notation and formulas accoring to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */ - double phi = lat / 180.0 * M_PI; - double lambda = lon / 180.0 * M_PI; - - double sin_phi = sin(phi); - double cos_phi = cos(phi); - - double k_bar = 0; - /* using small angle approximation (formula in comment is without aproximation) */ - double c = acos(sin_phi_1 * sin_phi + cos_phi_1 * cos_phi * (1 - pow((lambda - lambda_0), 2) / 2)); //double c = acos( sin_phi_1 * sin_phi + cos_phi_1 * cos_phi * cos(lambda - lambda_0) ); - - if (0 != c) - k_bar = c / sin(c); - - /* using small angle approximation (formula in comment is without aproximation) */ - *y = k_bar * (cos_phi * (lambda - lambda_0)) * scale;//*y = k_bar * (cos_phi * sin(lambda - lambda_0)) * scale; - *x = k_bar * ((cos_phi_1 * sin_phi - sin_phi_1 * cos_phi * (1 - pow((lambda - lambda_0), 2) / 2))) * scale; // *x = k_bar * ((cos_phi_1 * sin_phi - sin_phi_1 * cos_phi * cos(lambda - lambda_0))) * scale; - -// printf("%phi_1=%.10f, lambda_0 =%.10f\n", phi_1, lambda_0); -} - -/** - * Transforms a point in the local azimuthal equidistant plane to the geographic coordinate system - * - * @param x north - * @param y east - * @param lat in degrees (47.1234567°, not 471234567°) - * @param lon in degrees (8.1234567°, not 81234567°) - */ -static void map_projection_reproject(float x, float y, double *lat, double *lon) -{ - /* notation and formulas accoring to: http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html */ - - double x_descaled = x / scale; - double y_descaled = y / scale; - - double c = sqrt(pow(x_descaled, 2) + pow(y_descaled, 2)); - double sin_c = sin(c); - double cos_c = cos(c); - - double lat_sphere = 0; - - if (c != 0) - lat_sphere = asin(cos_c * sin_phi_1 + (x_descaled * sin_c * cos_phi_1) / c); - else - lat_sphere = asin(cos_c * sin_phi_1); - -// printf("lat_sphere = %.10f\n",lat_sphere); - - double lon_sphere = 0; - - if (phi_1 == M_PI / 2) { - //using small angle approximation (formula in comment is without aproximation) - lon_sphere = (lambda_0 - y_descaled / x_descaled); //lon_sphere = (lambda_0 + atan2(-y_descaled, x_descaled)); - - } else if (phi_1 == -M_PI / 2) { - //using small angle approximation (formula in comment is without aproximation) - lon_sphere = (lambda_0 + y_descaled / x_descaled); //lon_sphere = (lambda_0 + atan2(y_descaled, x_descaled)); - - } else { - - lon_sphere = (lambda_0 + atan2(y_descaled * sin_c , c * cos_phi_1 * cos_c - x_descaled * sin_phi_1 * sin_c)); - //using small angle approximation -// double denominator = (c * cos_phi_1 * cos_c - x_descaled * sin_phi_1 * sin_c); -// if(denominator != 0) -// { -// lon_sphere = (lambda_0 + (y_descaled * sin_c) / denominator); -// } -// else -// { -// ... -// } - } - -// printf("lon_sphere = %.10f\n",lon_sphere); - - *lat = lat_sphere * 180.0 / M_PI; - *lon = lon_sphere * 180.0 / M_PI; - -} - -/**************************************************************************** - * main - ****************************************************************************/ - -int position_estimator_main(int argc, char *argv[]) -{ - - /* welcome user */ - printf("[multirotor position_estimator] started\n"); - - /* initialize values */ - static float u[2] = {0, 0}; - static float z[3] = {0, 0, 0}; - static float xapo[N_STATES] = {0, 0, 0, 0, 0, 0}; - static float Papo[N_STATES * N_STATES] = {ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0, - ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0, - ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0, - ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0, - ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0, - ERROR_COVARIANCE_INIT, 0, 0, 0, 0, 0 - }; - - static float xapo1[N_STATES]; - static float Papo1[36]; - - static float gps_covariance[3] = {0.0f, 0.0f, 0.0f}; - - static uint16_t counter = 0; - position_estimator_counter_position_information = 0; - - uint8_t predict_only = 1; - - bool gps_valid = false; - - bool new_initialization = true; - - static double lat_current = 0.0d;//[°]] --> 47.0 - static double lon_current = 0.0d; //[°]] -->8.5 - float alt_current = 0.0f; - - - //TODO: handle flight without gps but with estimator - - /* subscribe to vehicle status, attitude, gps */ - struct vehicle_gps_position_s gps; - gps.fix_type = 0; - struct vehicle_status_s vstatus; - struct vehicle_attitude_s att; - - int vehicle_gps_sub = orb_subscribe(ORB_ID(vehicle_gps_position)); - int vehicle_status_sub = orb_subscribe(ORB_ID(vehicle_status)); - - /* subscribe to attitude at 100 Hz */ - int vehicle_attitude_sub = orb_subscribe(ORB_ID(vehicle_attitude)); - - /* wait until gps signal turns valid, only then can we initialize the projection */ - while (gps.fix_type < 3) { - struct pollfd fds[1] = { {.fd = vehicle_gps_sub, .events = POLLIN} }; - - /* wait for GPS updates, BUT READ VEHICLE STATUS (!) - * this choice is critical, since the vehicle status might not - * actually change, if this app is started after GPS lock was - * aquired. - */ - if (poll(fds, 1, 5000)) { - /* Wait for the GPS update to propagate (we have some time) */ - usleep(5000); - /* Read wether the vehicle status changed */ - orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps); - gps_valid = (gps.fix_type > 2); - } - } - - /* get gps value for first initialization */ - orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps); - lat_current = ((double)(gps.lat)) * 1e-7; - lon_current = ((double)(gps.lon)) * 1e-7; - alt_current = gps.alt * 1e-3; - - /* initialize coordinates */ - map_projection_init(lat_current, lon_current); - - /* publish global position messages only after first GPS message */ - struct vehicle_local_position_s local_pos = { - .x = 0, - .y = 0, - .z = 0 - }; - orb_advert_t local_pos_pub = orb_advertise(ORB_ID(vehicle_local_position), &local_pos); - - printf("[multirotor position estimator] initialized projection with: lat: %.10f, lon:%.10f\n", lat_current, lon_current); - - while (1) { - - /*This runs at the rate of the sensors, if we have also a new gps update this is used in the position_estimator function */ - struct pollfd fds[1] = { {.fd = vehicle_attitude_sub, .events = POLLIN} }; - - if (poll(fds, 1, 5000) <= 0) { - /* error / timeout */ - } else { - - orb_copy(ORB_ID(vehicle_attitude), vehicle_attitude_sub, &att); - /* got attitude, updating pos as well */ - orb_copy(ORB_ID(vehicle_gps_position), vehicle_gps_sub, &gps); - orb_copy(ORB_ID(vehicle_status), vehicle_status_sub, &vstatus); - - /*copy attitude */ - u[0] = att.roll; - u[1] = att.pitch; - - /* initialize map projection with the last estimate (not at full rate) */ - if (gps.fix_type > 2) { - /* Project gps lat lon (Geographic coordinate system) to plane*/ - map_projection_project(((double)(gps.lat)) * 1e-7, ((double)(gps.lon)) * 1e-7, &(z[0]), &(z[1])); - - local_pos.x = z[0]; - local_pos.y = z[1]; - /* negative offset from initialization altitude */ - local_pos.z = alt_current - (gps.alt) * 1e-3; - - - orb_publish(ORB_ID(vehicle_local_position), local_pos_pub, &local_pos); - } - - - // gps_covariance[0] = gps.eph; //TODO: needs scaling - // gps_covariance[1] = gps.eph; - // gps_covariance[2] = gps.epv; - - // } else { - // /* we can not use the gps signal (it is of low quality) */ - // predict_only = 1; - // } - - // // predict_only = 0; //TODO: only for testing, removeme, XXX - // // z[0] = sinf(((float)counter)/180.0f*3.14159265f); //TODO: only for testing, removeme, XXX - // // usleep(100000); //TODO: only for testing, removeme, XXX - - - // /*Get new estimation (this is calculated in the plane) */ - // //TODO: if new_initialization == true: use 0,0,0, else use xapo - // if (true == new_initialization) { //TODO,XXX: uncomment! - // xapo[0] = 0; //we have a new plane initialization. the current estimate is in the center of the plane - // xapo[2] = 0; - // xapo[4] = 0; - // position_estimator(u, z, xapo, Papo, gps_covariance, predict_only, xapo1, Papo1); - - // } else { - // position_estimator(u, z, xapo, Papo, gps_covariance, predict_only, xapo1, Papo1); - // } - - - - // /* Copy values from xapo1 to xapo */ - // int i; - - // for (i = 0; i < N_STATES; i++) { - // xapo[i] = xapo1[i]; - // } - - // if ((counter % REPROJECTION_COUNTER_LIMIT == 0) || (counter % (PROJECTION_INITIALIZE_COUNTER_LIMIT - 1) == 0)) { - // /* Reproject from plane to geographic coordinate system */ - // // map_projection_reproject(xapo1[0], xapo1[2], map_scale, phi_1, lambda_0, &lat_current, &lon_current) //TODO,XXX: uncomment! - // map_projection_reproject(z[0], z[1], &lat_current, &lon_current); //do not use estimator for projection testing, removeme - // // //DEBUG - // // if(counter%500 == 0) - // // { - // // printf("phi_1: %.10f\n", phi_1); - // // printf("lambda_0: %.10f\n", lambda_0); - // // printf("lat_estimated: %.10f\n", lat_current); - // // printf("lon_estimated: %.10f\n", lon_current); - // // printf("z[0]=%.10f, z[1]=%.10f, z[2]=%f\n", z[0], z[1], z[2]); - // // fflush(stdout); - // // - // // } - - // // if(!isnan(lat_current) && !isnan(lon_current))// && !isnan(xapo1[4]) && !isnan(xapo1[1]) && !isnan(xapo1[3]) && !isnan(xapo1[5])) - // // { - // /* send out */ - - // global_pos.lat = lat_current; - // global_pos.lon = lon_current; - // global_pos.alt = xapo1[4]; - // global_pos.vx = xapo1[1]; - // global_pos.vy = xapo1[3]; - // global_pos.vz = xapo1[5]; - - /* publish current estimate */ - // orb_publish(ORB_ID(vehicle_global_position), global_pos_pub, &global_pos); - // } - // else - // { - // printf("[position estimator] ERROR: nan values, lat_current=%.4f, lon_current=%.4f, z[0]=%.4f z[1]=%.4f\n", lat_current, lon_current, z[0], z[1]); - // fflush(stdout); - // } - - // } - - counter++; - } - - } - - return 0; -} - - |