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AC_AttControl: Stabilize input shaping

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lthall 2014-02-19 15:55:45 +09:00 committed by Randy Mackay
parent 5f85e7af6a
commit 15f88c2a2b
2 changed files with 70 additions and 0 deletions
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67
libraries/AC_AttitudeControl/AC_AttitudeControl.cpp
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@ -81,6 +81,73 @@ void AC_AttitudeControl::init_targets()
// methods to be called by upper controllers to request and implement a desired attitude
//
// angle_ef_roll_pitch_rate_ef_yaw - attempts to maintain a roll and pitch angle and yaw rate (all earth frame)
void AC_AttitudeControl::angle_ef_roll_pitch_rate_ef_yaw_smooth(float roll_angle_ef, float pitch_angle_ef, float yaw_rate_ef)
{
Vector3f angle_ef_error; // earth frame angle errors
float rate_change_limit;
// set earth-frame angle targets for roll and pitch and calculate angle error
float rc_feel_rp = 0.1;
float pid_P = rc_feel_rp/_dt;
float linear_angle = _accel_rp_max/(2.0*pid_P*pid_P);
rate_change_limit = _accel_rp_max * _dt;
float rate_ef_desired;
float angle_to_target;
angle_to_target = roll_angle_ef - _angle_ef_target.x;
if (angle_to_target > 2.0*linear_angle){
rate_ef_desired = safe_sqrt(2.0*_accel_rp_max*(fabs(angle_to_target)-linear_angle));
} else if (angle_to_target < -2.0*linear_angle){
rate_ef_desired = -safe_sqrt(2.0*_accel_rp_max*(fabs(angle_to_target)-linear_angle));
} else {
rate_ef_desired = pid_P*angle_to_target;
}
_rate_ef_desired.x = constrain_float(rate_ef_desired, _rate_ef_desired.x-rate_change_limit, _rate_ef_desired.x+rate_change_limit);
_rate_ef_desired.x = constrain_float(_rate_ef_desired.x, -_angle_rate_rp_max, _angle_rate_rp_max);
_angle_ef_target.x += _rate_ef_desired.x*_dt;
angle_ef_error.x = wrap_180_cd_float(_angle_ef_target.x - _ahrs.roll_sensor);
angle_to_target = pitch_angle_ef - _angle_ef_target.y;
if (angle_to_target > 2.0*linear_angle){
rate_ef_desired = safe_sqrt(2.0*_accel_rp_max*(fabs(angle_to_target)-linear_angle));
} else if (angle_to_target < -2.0*linear_angle){
rate_ef_desired = -safe_sqrt(2.0*_accel_rp_max*(fabs(angle_to_target)-linear_angle));
} else {
rate_ef_desired = pid_P*angle_to_target;
}
_rate_ef_desired.y = constrain_float(rate_ef_desired, _rate_ef_desired.y-rate_change_limit, _rate_ef_desired.y+rate_change_limit);
_rate_ef_desired.y = constrain_float(_rate_ef_desired.y, -_angle_rate_rp_max, _angle_rate_rp_max);
_angle_ef_target.y += _rate_ef_desired.y*_dt;
angle_ef_error.y = wrap_180_cd_float(_angle_ef_target.y - _ahrs.pitch_sensor);
// set earth-frame feed forward rate for yaw
rate_change_limit = _accel_y_max * _dt;
float rate_change = yaw_rate_ef - _rate_ef_desired.z;
rate_change = constrain_float(rate_change, -rate_change_limit, rate_change_limit);
_rate_ef_desired.z += rate_change;
update_ef_yaw_angle_and_error(_rate_ef_desired.z, angle_ef_error);
// convert earth-frame angle errors to body-frame angle errors
frame_conversion_ef_to_bf(angle_ef_error, _angle_bf_error);
// convert earth-frame feed forward rates to body-frame feed forward rates
frame_conversion_ef_to_bf(_rate_ef_desired, _rate_bf_desired);
// convert body-frame angle errors to body-frame rate targets
update_rate_bf_targets();
// add body frame rate feed forward
_rate_bf_target += _rate_bf_desired;
// body-frame to motor outputs should be called separately
}
//
// methods to be called by upper controllers to request and implement a desired attitude
//
// angle_ef_roll_pitch_rate_ef_yaw - attempts to maintain a roll and pitch angle and yaw rate (all earth frame)
void AC_AttitudeControl::angle_ef_roll_pitch_rate_ef_yaw(float roll_angle_ef, float pitch_angle_ef, float yaw_rate_ef)
{

3
libraries/AC_AttitudeControl/AC_AttitudeControl.h
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@ -79,6 +79,9 @@ public:
// methods to be called by upper controllers to request and implement a desired attitude
//
// angle_ef_roll_pitch_rate_ef_yaw - attempts to maintain a roll and pitch angle and yaw rate (all earth frame)
void angle_ef_roll_pitch_rate_ef_yaw_smooth(float roll_angle_ef, float pitch_angle_ef, float yaw_rate_ef);
// angle_ef_roll_pitch_rate_ef_yaw - attempts to maintain a roll and pitch angle and yaw rate (all earth frame)
void angle_ef_roll_pitch_rate_ef_yaw(float roll_angle_ef, float pitch_angle_ef, float yaw_rate_ef);