mirror of https://github.com/ArduPilot/ardupilot
AC_WP_Nav: Convert S-Curves to use maximum Snap to remove minimum time between waypoints
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@ -177,7 +177,7 @@ void AC_WPNav::wp_and_spline_init(float speed_cms)
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if (!is_positive(_wp_jerk)) {
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if (!is_positive(_wp_jerk)) {
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_wp_jerk = _wp_accel_cmss;
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_wp_jerk = _wp_accel_cmss;
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}
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}
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calc_scurve_jerk_and_jerk_time();
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calc_scurve_jerk_and_snap();
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_scurve_prev_leg.init();
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_scurve_prev_leg.init();
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_scurve_this_leg.init();
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_scurve_this_leg.init();
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@ -334,7 +334,7 @@ bool AC_WPNav::set_wp_destination(const Vector3f& destination, bool terrain_alt)
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_scurve_this_leg.calculate_track(_origin, _destination,
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_scurve_this_leg.calculate_track(_origin, _destination,
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_pos_control.get_max_speed_xy_cms(), _pos_control.get_max_speed_up_cms(), _pos_control.get_max_speed_down_cms(),
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_pos_control.get_max_speed_xy_cms(), _pos_control.get_max_speed_up_cms(), _pos_control.get_max_speed_down_cms(),
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_wp_accel_cmss, _wp_accel_z_cmss,
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_wp_accel_cmss, _wp_accel_z_cmss,
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_scurve_jerk_time, _scurve_jerk * 100.0f);
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_scurve_snap * 100.0f, _scurve_jerk * 100.0f);
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if (!is_zero(origin_speed)) {
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if (!is_zero(origin_speed)) {
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// rebuild start of scurve if we have a non-zero origin speed
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// rebuild start of scurve if we have a non-zero origin speed
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_scurve_this_leg.set_origin_speed_max(origin_speed);
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_scurve_this_leg.set_origin_speed_max(origin_speed);
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@ -362,7 +362,7 @@ bool AC_WPNav::set_wp_destination_next(const Vector3f& destination, bool terrain
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_scurve_next_leg.calculate_track(_destination, destination,
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_scurve_next_leg.calculate_track(_destination, destination,
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_pos_control.get_max_speed_xy_cms(), _pos_control.get_max_speed_up_cms(), _pos_control.get_max_speed_down_cms(),
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_pos_control.get_max_speed_xy_cms(), _pos_control.get_max_speed_up_cms(), _pos_control.get_max_speed_down_cms(),
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_wp_accel_cmss, _wp_accel_z_cmss,
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_wp_accel_cmss, _wp_accel_z_cmss,
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_scurve_jerk_time, _scurve_jerk * 100.0f);
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_scurve_snap * 100.0f, _scurve_jerk * 100.0);
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if (_this_leg_is_spline) {
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if (_this_leg_is_spline) {
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const float this_leg_dest_speed_max = _spline_this_leg.get_destination_speed_max();
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const float this_leg_dest_speed_max = _spline_this_leg.get_destination_speed_max();
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const float next_leg_origin_speed_max = _scurve_next_leg.set_origin_speed_max(this_leg_dest_speed_max);
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const float next_leg_origin_speed_max = _scurve_next_leg.set_origin_speed_max(this_leg_dest_speed_max);
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@ -857,8 +857,8 @@ bool AC_WPNav::get_vector_NEU(const Location &loc, Vector3f &vec, bool &terrain_
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}
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}
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// helper function to calculate scurve jerk and jerk_time values
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// helper function to calculate scurve jerk and jerk_time values
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// updates _scurve_jerk and _scurve_jerk_time
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// updates _scurve_jerk and _scurve_snap
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void AC_WPNav::calc_scurve_jerk_and_jerk_time()
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void AC_WPNav::calc_scurve_jerk_and_snap()
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{
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{
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// calculate jerk
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// calculate jerk
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_scurve_jerk = MIN(_attitude_control.get_ang_vel_roll_max_rads() * GRAVITY_MSS, _attitude_control.get_ang_vel_pitch_max_rads() * GRAVITY_MSS);
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_scurve_jerk = MIN(_attitude_control.get_ang_vel_roll_max_rads() * GRAVITY_MSS, _attitude_control.get_ang_vel_pitch_max_rads() * GRAVITY_MSS);
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@ -868,14 +868,14 @@ void AC_WPNav::calc_scurve_jerk_and_jerk_time()
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_scurve_jerk = MIN(_scurve_jerk, _wp_jerk);
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_scurve_jerk = MIN(_scurve_jerk, _wp_jerk);
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}
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}
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// calculate jerk time
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// calculate maximum snap
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// Jounce (the rate of change of jerk) uses the attitude control input time constant because multicopters
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// Snap (the rate of change of jerk) uses the attitude control input time constant because multicopters
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// lean to accelerate. This means the change in angle is equivalent to the change in acceleration
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// lean to accelerate. This means the change in angle is equivalent to the change in acceleration
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const float jounce = MIN(_attitude_control.get_accel_roll_max_radss() * GRAVITY_MSS, _attitude_control.get_accel_pitch_max_radss() * GRAVITY_MSS);
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_scurve_snap = (_scurve_jerk * M_PI) / (2.0 * MAX(_attitude_control.get_input_tc(), 0.1f));
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if (is_positive(jounce)) {
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const float snap = MIN(_attitude_control.get_accel_roll_max_radss(), _attitude_control.get_accel_pitch_max_radss()) * GRAVITY_MSS;
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_scurve_jerk_time = MAX(_attitude_control.get_input_tc(), 0.5f * _scurve_jerk * M_PI / jounce);
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if (is_positive(snap)) {
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} else {
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_scurve_snap = MIN(_scurve_snap, snap);
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_scurve_jerk_time = MAX(_attitude_control.get_input_tc(), 0.1f);
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}
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}
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_scurve_jerk_time *= 2.0f;
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// reduce maximum snap by a factor of two from what the aircraft is capable of
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_scurve_snap *= 0.5;
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}
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}
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@ -213,8 +213,8 @@ protected:
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} _flags;
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} _flags;
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// helper function to calculate scurve jerk and jerk_time values
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// helper function to calculate scurve jerk and jerk_time values
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// updates _scurve_jerk and _scurve_jerk_time
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// updates _scurve_jerk and _scurve_snap
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void calc_scurve_jerk_and_jerk_time();
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void calc_scurve_jerk_and_snap();
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// references and pointers to external libraries
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// references and pointers to external libraries
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const AP_InertialNav& _inav;
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const AP_InertialNav& _inav;
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@ -241,7 +241,7 @@ protected:
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SCurve _scurve_this_leg; // current scurve trajectory
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SCurve _scurve_this_leg; // current scurve trajectory
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SCurve _scurve_next_leg; // next scurve trajectory used to blend with current scurve trajectory
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SCurve _scurve_next_leg; // next scurve trajectory used to blend with current scurve trajectory
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float _scurve_jerk; // scurve jerk max in m/s/s/s
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float _scurve_jerk; // scurve jerk max in m/s/s/s
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float _scurve_jerk_time; // scurve jerk time (time in seconds for jerk to increase from zero _scurve_jerk)
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float _scurve_snap; // scurve snap in m/s/s/s/s
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// spline curves
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// spline curves
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SplineCurve _spline_this_leg; // spline curve for current segment
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SplineCurve _spline_this_leg; // spline curve for current segment
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