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author | Thomas Gubler <thomasgubler@gmail.com> | 2014-10-07 10:01:16 +0200 |
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committer | Thomas Gubler <thomasgubler@gmail.com> | 2014-10-07 10:01:16 +0200 |
commit | 5d52978bc780707d63c1422369842629d26fb1e2 (patch) | |
tree | 70d1e8b876f8d399764afeec613ca12d968a9393 /src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp | |
parent | c0eefc983a5bbe2faf05eb21daaf3514b767daa6 (diff) | |
parent | 852159d9edaa85c3abee3059359264f3329841e8 (diff) | |
download | px4-firmware-5d52978bc780707d63c1422369842629d26fb1e2.tar.gz px4-firmware-5d52978bc780707d63c1422369842629d26fb1e2.tar.bz2 px4-firmware-5d52978bc780707d63c1422369842629d26fb1e2.zip |
Merge pull request #1341 from PX4/fwlandingterrain
FW landing: use terrain estimate
Diffstat (limited to 'src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp')
-rw-r--r-- | src/modules/fw_pos_control_l1/fw_pos_control_l1_main.cpp | 132 |
1 files changed, 63 insertions, 69 deletions
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 fdb1b2429..dbaecfbed 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 @@ -88,7 +88,6 @@ #include <launchdetection/LaunchDetector.h> #include <ecl/l1/ecl_l1_pos_controller.h> #include <external_lgpl/tecs/tecs.h> -#include <drivers/drv_range_finder.h> #include "landingslope.h" #include "mtecs/mTecs.h" @@ -146,7 +145,6 @@ private: int _params_sub; /**< notification of parameter updates */ int _manual_control_sub; /**< notification of manual control updates */ int _sensor_combined_sub; /**< for body frame accelerations */ - int _range_finder_sub; /**< range finder subscription */ orb_advert_t _attitude_sp_pub; /**< attitude setpoint */ orb_advert_t _tecs_status_pub; /**< TECS status publication */ @@ -162,17 +160,16 @@ private: struct vehicle_global_position_s _global_pos; /**< global vehicle position */ struct position_setpoint_triplet_s _pos_sp_triplet; /**< triplet of mission items */ struct sensor_combined_s _sensor_combined; /**< for body frame accelerations */ - struct range_finder_report _range_finder; /**< range finder report */ perf_counter_t _loop_perf; /**< loop performance counter */ /* land states */ - /* not in non-abort mode for landing yet */ bool land_noreturn_horizontal; bool land_noreturn_vertical; bool land_stayonground; bool land_motor_lim; bool land_onslope; + bool land_useterrain; /* takeoff/launch states */ LaunchDetectionResult launch_detection_state; @@ -243,7 +240,9 @@ private: float land_flare_alt_relative; float land_thrust_lim_alt_relative; float land_heading_hold_horizontal_distance; - float range_finder_rel_alt; + float land_flare_pitch_min_deg; + float land_flare_pitch_max_deg; + int land_use_terrain_estimate; } _parameters; /**< local copies of interesting parameters */ @@ -289,7 +288,9 @@ private: param_t land_flare_alt_relative; param_t land_thrust_lim_alt_relative; param_t land_heading_hold_horizontal_distance; - param_t range_finder_rel_alt; + param_t land_flare_pitch_min_deg; + param_t land_flare_pitch_max_deg; + param_t land_use_terrain_estimate; } _parameter_handles; /**< handles for interesting parameters */ @@ -321,12 +322,6 @@ private: bool vehicle_airspeed_poll(); /** - * Check for range finder updates. - */ - bool range_finder_poll(); - - - /** * Check for position updates. */ void vehicle_attitude_poll(); @@ -347,9 +342,9 @@ private: void navigation_capabilities_publish(); /** - * Get the relative alt either from the difference between estimate and waypoint or from the laser range finder + * Return the terrain estimate during landing: uses the wp altitude value or the terrain estimate if available */ - float get_relative_landingalt(float land_setpoint_alt, float current_alt, const struct range_finder_report &range_finder, float range_finder_use_relative_alt); + float get_terrain_altitude_landing(float land_setpoint_alt, const struct vehicle_global_position_s &global_pos); /** * Control position. @@ -423,7 +418,6 @@ FixedwingPositionControl::FixedwingPositionControl() : _params_sub(-1), _manual_control_sub(-1), _sensor_combined_sub(-1), - _range_finder_sub(-1), /* publications */ _attitude_sp_pub(-1), @@ -441,7 +435,6 @@ FixedwingPositionControl::FixedwingPositionControl() : _global_pos(), _pos_sp_triplet(), _sensor_combined(), - _range_finder(), /* performance counters */ _loop_perf(perf_alloc(PC_ELAPSED, "fw l1 control")), @@ -451,6 +444,7 @@ FixedwingPositionControl::FixedwingPositionControl() : land_stayonground(false), land_motor_lim(false), land_onslope(false), + land_useterrain(false), launch_detection_state(LAUNCHDETECTION_RES_NONE), last_manual(false), landingslope(), @@ -489,7 +483,9 @@ FixedwingPositionControl::FixedwingPositionControl() : _parameter_handles.land_flare_alt_relative = param_find("FW_LND_FLALT"); _parameter_handles.land_thrust_lim_alt_relative = param_find("FW_LND_TLALT"); _parameter_handles.land_heading_hold_horizontal_distance = param_find("FW_LND_HHDIST"); - _parameter_handles.range_finder_rel_alt = param_find("FW_LND_RFRALT"); + _parameter_handles.land_flare_pitch_min_deg = param_find("FW_FLARE_PMIN"); + _parameter_handles.land_flare_pitch_max_deg = param_find("FW_FLARE_PMAX"); + _parameter_handles.land_use_terrain_estimate= param_find("FW_LND_USETER"); _parameter_handles.time_const = param_find("FW_T_TIME_CONST"); _parameter_handles.time_const_throt = param_find("FW_T_THRO_CONST"); @@ -590,8 +586,9 @@ FixedwingPositionControl::parameters_update() } param_get(_parameter_handles.land_heading_hold_horizontal_distance, &(_parameters.land_heading_hold_horizontal_distance)); - - param_get(_parameter_handles.range_finder_rel_alt, &(_parameters.range_finder_rel_alt)); + param_get(_parameter_handles.land_flare_pitch_min_deg, &(_parameters.land_flare_pitch_min_deg)); + param_get(_parameter_handles.land_flare_pitch_max_deg, &(_parameters.land_flare_pitch_max_deg)); + param_get(_parameter_handles.land_use_terrain_estimate, &(_parameters.land_use_terrain_estimate)); _l1_control.set_l1_damping(_parameters.l1_damping); _l1_control.set_l1_period(_parameters.l1_period); @@ -695,20 +692,6 @@ FixedwingPositionControl::vehicle_airspeed_poll() return airspeed_updated; } -bool -FixedwingPositionControl::range_finder_poll() -{ - /* check if there is a range finder measurement */ - bool range_finder_updated; - orb_check(_range_finder_sub, &range_finder_updated); - - if (range_finder_updated) { - orb_copy(ORB_ID(sensor_range_finder), _range_finder_sub, &_range_finder); - } - - return range_finder_updated; -} - void FixedwingPositionControl::vehicle_attitude_poll() { @@ -846,21 +829,23 @@ void FixedwingPositionControl::navigation_capabilities_publish() } } -float FixedwingPositionControl::get_relative_landingalt(float land_setpoint_alt, float current_alt, const struct range_finder_report &range_finder, float range_finder_use_relative_alt) +float FixedwingPositionControl::get_terrain_altitude_landing(float land_setpoint_alt, const struct vehicle_global_position_s &global_pos) { - float rel_alt_estimated = current_alt - land_setpoint_alt; - - /* only use range finder if: - * parameter (range_finder_use_relative_alt) > 0 - * the measurement is valid - * the estimated relative altitude (from global altitude estimate and landing waypoint) <= range_finder_use_relative_alt - */ - if (range_finder_use_relative_alt < 0 || !range_finder.valid || range_finder.distance > range_finder_use_relative_alt ) { - return rel_alt_estimated; + if (!isfinite(global_pos.terrain_alt)) { + return land_setpoint_alt; } - return range_finder.distance; - + /* Decide if the terrain estimation can be used, once we switched to using the terrain we stick with it + * for the whole landing */ + if (_parameters.land_use_terrain_estimate && (global_pos.terrain_alt_valid || land_useterrain)) { + if(!land_useterrain) { + mavlink_log_info(_mavlink_fd, "#audio: Landing, using terrain estimate"); + land_useterrain = true; + } + return global_pos.terrain_alt; + } else { + return land_setpoint_alt; + } } bool @@ -965,10 +950,17 @@ FixedwingPositionControl::control_position(const math::Vector<2> ¤t_positi } else if (pos_sp_triplet.current.type == SETPOINT_TYPE_LAND) { float bearing_lastwp_currwp = get_bearing_to_next_waypoint(prev_wp(0), prev_wp(1), curr_wp(0), curr_wp(1)); + float bearing_airplane_currwp = get_bearing_to_next_waypoint(current_position(0), current_position(1), curr_wp(0), curr_wp(1)); /* Horizontal landing control */ /* switch to heading hold for the last meters, continue heading hold after */ float wp_distance = get_distance_to_next_waypoint(current_position(0), current_position(1), curr_wp(0), curr_wp(1)); + /* calculate a waypoint distance value which is 0 when the aircraft is behind the waypoint */ + float wp_distance_save = wp_distance; + if (fabsf(bearing_airplane_currwp - bearing_lastwp_currwp) >= math::radians(90.0f)) { + wp_distance_save = 0.0f; + } + //warnx("wp dist: %d, alt err: %d, noret: %s", (int)wp_distance, (int)altitude_error, (land_noreturn) ? "YES" : "NO"); if (wp_distance < _parameters.land_heading_hold_horizontal_distance || land_noreturn_horizontal) { @@ -1004,29 +996,30 @@ FixedwingPositionControl::control_position(const math::Vector<2> ¤t_positi /* Vertical landing control */ //xxx: using the tecs altitude controller for slope control for now - -// /* do not go down too early */ -// if (wp_distance > 50.0f) { -// altitude_error = (_global_triplet.current.alt + 25.0f) - _global_pos.alt; -// } /* apply minimum pitch (flare) and limit roll if close to touch down, altitude error is negative (going down) */ // XXX this could make a great param - float flare_pitch_angle_rad = -math::radians(5.0f);//math::radians(pos_sp_triplet.current.param1) float throttle_land = _parameters.throttle_min + (_parameters.throttle_max - _parameters.throttle_min) * 0.1f; float airspeed_land = 1.3f * _parameters.airspeed_min; float airspeed_approach = 1.3f * _parameters.airspeed_min; + /* Get an estimate of the terrain altitude if available, otherwise terrain_alt will be + * equal to _pos_sp_triplet.current.alt */ + float terrain_alt = get_terrain_altitude_landing(_pos_sp_triplet.current.alt, _global_pos); + /* Calculate distance (to landing waypoint) and altitude of last ordinary waypoint L */ - float L_altitude_rel = _pos_sp_triplet.previous.valid ? _pos_sp_triplet.previous.alt - _pos_sp_triplet.current.alt : 0.0f; + float L_altitude_rel = _pos_sp_triplet.previous.valid ? + _pos_sp_triplet.previous.alt - terrain_alt : 0.0f; - float bearing_airplane_currwp = get_bearing_to_next_waypoint(current_position(0), current_position(1), curr_wp(0), curr_wp(1)); float landing_slope_alt_rel_desired = landingslope.getLandingSlopeRelativeAltitudeSave(wp_distance, bearing_lastwp_currwp, bearing_airplane_currwp); - float relative_alt = get_relative_landingalt(_pos_sp_triplet.current.alt, _global_pos.alt, _range_finder, _parameters.range_finder_rel_alt); - - if ( (relative_alt < landingslope.flare_relative_alt()) || land_noreturn_vertical) { //checking for land_noreturn to avoid unwanted climb out - + /* Check if we should start flaring with a vertical and a + * horizontal limit (with some tolerance) + * The horizontal limit is only applied when we are in front of the wp + */ + if (((_global_pos.alt < terrain_alt + landingslope.flare_relative_alt()) && + (wp_distance_save < landingslope.flare_length() + 5.0f)) || + land_noreturn_vertical) { //checking for land_noreturn to avoid unwanted climb out /* land with minimal speed */ // /* force TECS to only control speed with pitch, altitude is only implicitely controlled now */ @@ -1035,7 +1028,7 @@ FixedwingPositionControl::control_position(const math::Vector<2> ¤t_positi /* kill the throttle if param requests it */ throttle_max = _parameters.throttle_max; - if (relative_alt < landingslope.motor_lim_relative_alt() || land_motor_lim) { + if (_global_pos.alt < terrain_alt + landingslope.motor_lim_relative_alt() || land_motor_lim) { throttle_max = math::min(throttle_max, _parameters.throttle_land_max); if (!land_motor_lim) { land_motor_lim = true; @@ -1053,12 +1046,13 @@ FixedwingPositionControl::control_position(const math::Vector<2> ¤t_positi land_stayonground = true; } - tecs_update_pitch_throttle(_pos_sp_triplet.current.alt + flare_curve_alt_rel, + tecs_update_pitch_throttle(terrain_alt + flare_curve_alt_rel, calculate_target_airspeed(airspeed_land), eas2tas, - flare_pitch_angle_rad, math::radians(15.0f), + math::radians(_parameters.land_flare_pitch_min_deg), + math::radians(_parameters.land_flare_pitch_max_deg), 0.0f, throttle_max, throttle_land, - false, flare_pitch_angle_rad, - _pos_sp_triplet.current.alt + relative_alt, ground_speed, + false, land_motor_lim ? math::radians(_parameters.land_flare_pitch_min_deg) : math::radians(_parameters.pitch_limit_min), + _global_pos.alt, ground_speed, land_motor_lim ? TECS_MODE_LAND_THROTTLELIM : TECS_MODE_LAND); if (!land_noreturn_vertical) { @@ -1079,8 +1073,8 @@ FixedwingPositionControl::control_position(const math::Vector<2> ¤t_positi * if current position is below the slope continue at previous wp altitude * until the intersection with slope * */ - float altitude_desired_rel = relative_alt; - if (relative_alt > landing_slope_alt_rel_desired || land_onslope) { + float altitude_desired_rel; + if (_global_pos.alt > terrain_alt + landing_slope_alt_rel_desired || land_onslope) { /* stay on slope */ altitude_desired_rel = landing_slope_alt_rel_desired; if (!land_onslope) { @@ -1089,10 +1083,11 @@ FixedwingPositionControl::control_position(const math::Vector<2> ¤t_positi } } else { /* continue horizontally */ - altitude_desired_rel = _pos_sp_triplet.previous.valid ? L_altitude_rel : relative_alt; + altitude_desired_rel = _pos_sp_triplet.previous.valid ? L_altitude_rel : + _global_pos.alt - terrain_alt; } - tecs_update_pitch_throttle(_pos_sp_triplet.current.alt + altitude_desired_rel, + tecs_update_pitch_throttle(terrain_alt + altitude_desired_rel, calculate_target_airspeed(airspeed_approach), eas2tas, math::radians(_parameters.pitch_limit_min), math::radians(_parameters.pitch_limit_max), @@ -1101,7 +1096,7 @@ FixedwingPositionControl::control_position(const math::Vector<2> ¤t_positi _parameters.throttle_cruise, false, math::radians(_parameters.pitch_limit_min), - _pos_sp_triplet.current.alt + relative_alt, + _global_pos.alt, ground_speed); } @@ -1278,7 +1273,6 @@ FixedwingPositionControl::task_main() _airspeed_sub = orb_subscribe(ORB_ID(airspeed)); _params_sub = orb_subscribe(ORB_ID(parameter_update)); _manual_control_sub = orb_subscribe(ORB_ID(manual_control_setpoint)); - _range_finder_sub = orb_subscribe(ORB_ID(sensor_range_finder)); /* rate limit control mode updates to 5Hz */ orb_set_interval(_control_mode_sub, 200); @@ -1357,7 +1351,6 @@ FixedwingPositionControl::task_main() vehicle_setpoint_poll(); vehicle_sensor_combined_poll(); vehicle_airspeed_poll(); - range_finder_poll(); // vehicle_baro_poll(); math::Vector<3> ground_speed(_global_pos.vel_n, _global_pos.vel_e, _global_pos.vel_d); @@ -1421,6 +1414,7 @@ void FixedwingPositionControl::reset_landing_state() land_stayonground = false; land_motor_lim = false; land_onslope = false; + land_useterrain = false; } void FixedwingPositionControl::tecs_update_pitch_throttle(float alt_sp, float v_sp, float eas2tas, |