mirror of https://github.com/ArduPilot/ardupilot
AC_Loiter: reduce twitch on init
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@ -123,15 +123,12 @@ void AC_Loiter::init_target()
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_pos_control.set_accel_xy(_accel_cmss);
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_pos_control.set_leash_length_xy(LOITER_POS_CORRECTION_MAX);
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// initialise desired acceleration based on the current velocity and the artificial drag
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float pilot_acceleration_max = GRAVITY_MSS*100.0f * tanf(radians(get_angle_max_cd()*0.01f));
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_predicted_accel.x = pilot_acceleration_max*curr_vel.x/_speed_cms;
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_predicted_accel.y = pilot_acceleration_max*curr_vel.y/_speed_cms;
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_desired_accel = _predicted_accel;
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// this should be the current roll and pitch angle.
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_predicted_euler_angle.x = radians(_attitude_control.get_att_target_euler_cd().x*0.01f);
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_predicted_euler_angle.y = radians(_attitude_control.get_att_target_euler_cd().y*0.01f);
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_predicted_accel = _desired_accel;
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// update angle targets that will be passed to stabilize controller
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float roll_cd, pitch_cd;
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_pos_control.accel_to_lean_angles(_predicted_accel.x, _predicted_accel.y, roll_cd, pitch_cd);
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_predicted_euler_angle.x = radians(roll_cd*0.01);
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_predicted_euler_angle.y = radians(pitch_cd*0.01);
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// set target position
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_pos_control.set_xy_target(curr_pos.x, curr_pos.y);
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@ -160,6 +157,15 @@ void AC_Loiter::set_pilot_desired_acceleration(float euler_roll_angle_cd, float
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const float euler_roll_angle = radians(euler_roll_angle_cd*0.01f);
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const float euler_pitch_angle = radians(euler_pitch_angle_cd*0.01f);
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// convert our desired attitude to an acceleration vector assuming we are hovering
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const float pilot_cos_pitch_target = constrain_float(cosf(euler_pitch_angle), 0.5f, 1.0f);
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const float pilot_accel_rgt_cms = GRAVITY_MSS*100.0f * tanf(euler_roll_angle)/pilot_cos_pitch_target;
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const float pilot_accel_fwd_cms = -GRAVITY_MSS*100.0f * tanf(euler_pitch_angle);
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// rotate acceleration vectors input to lat/lon frame
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_desired_accel.x = (pilot_accel_fwd_cms*_ahrs.cos_yaw() - pilot_accel_rgt_cms*_ahrs.sin_yaw());
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_desired_accel.y = (pilot_accel_fwd_cms*_ahrs.sin_yaw() + pilot_accel_rgt_cms*_ahrs.cos_yaw());
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// difference between where we think we should be and where we want to be
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Vector2f angle_error(wrap_PI(euler_roll_angle - _predicted_euler_angle.x), wrap_PI(euler_pitch_angle - _predicted_euler_angle.y));
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@ -169,19 +175,12 @@ void AC_Loiter::set_pilot_desired_acceleration(float euler_roll_angle_cd, float
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// update our predicted attitude based on our predicted angular velocity
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_predicted_euler_angle += _predicted_euler_rate * dt;
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// convert our desired attitude to an acceleration vector assuming we are hovering
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const float pilot_cos_pitch_target = cosf(euler_pitch_angle);
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const float pilot_accel_rgt_cms = GRAVITY_MSS*100.0f * tanf(euler_roll_angle)/pilot_cos_pitch_target;
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const float pilot_accel_fwd_cms = -GRAVITY_MSS*100.0f * tanf(euler_pitch_angle);
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// convert our predicted attitude to an acceleration vector assuming we are hovering
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const float pilot_predicted_cos_pitch_target = cosf(_predicted_euler_angle.y);
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const float pilot_predicted_accel_rgt_cms = GRAVITY_MSS*100.0f * tanf(_predicted_euler_angle.x)/pilot_predicted_cos_pitch_target;
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const float pilot_predicted_accel_fwd_cms = -GRAVITY_MSS*100.0f * tanf(_predicted_euler_angle.y);
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// rotate acceleration vectors input to lat/lon frame
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_desired_accel.x = (pilot_accel_fwd_cms*_ahrs.cos_yaw() - pilot_accel_rgt_cms*_ahrs.sin_yaw());
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_desired_accel.y = (pilot_accel_fwd_cms*_ahrs.sin_yaw() + pilot_accel_rgt_cms*_ahrs.cos_yaw());
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_predicted_accel.x = (pilot_predicted_accel_fwd_cms*_ahrs.cos_yaw() - pilot_predicted_accel_rgt_cms*_ahrs.sin_yaw());
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_predicted_accel.y = (pilot_predicted_accel_fwd_cms*_ahrs.sin_yaw() + pilot_predicted_accel_rgt_cms*_ahrs.cos_yaw());
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}
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