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[rotorcraft] horizontal guidance fixedpoint fixes

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Significantly reduce the quantization error of the horizontal guidance cmds.
This should result in nicer position hold and better trajectory tracking.
Verified in NPS sim.
This commit is contained in:
Felix Ruess
2013-03-25 13:38:13 +01:00
parent d1a78516d1
commit 68d07e6128
4 changed files with 15 additions and 12 deletions
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sw/airborne/firmwares/rotorcraft/guidance/guidance_h.c
+8 -8
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@@ -288,15 +288,15 @@ static inline void guidance_h_traj_run(bool_t in_flight) {
/* run PID */
guidance_h_command_earth.x =
guidance_h_pgain * (guidance_h_pos_err.x >> (INT32_POS_FRAC - GH_GAIN_SCALE)) +
guidance_h_dgain * (guidance_h_speed_err.x >> (INT32_SPEED_FRAC - GH_GAIN_SCALE)) +
guidance_h_igain * (guidance_h_pos_err_sum.x >> (12 + INT32_POS_FRAC - GH_GAIN_SCALE)) +
guidance_h_again * (guidance_h_accel_ref.x >> 8); /* feedforward gain */
((guidance_h_pgain * guidance_h_pos_err.x) >> (INT32_POS_FRAC - GH_GAIN_SCALE)) +
((guidance_h_dgain * (guidance_h_speed_err.x >> 2)) >> (INT32_SPEED_FRAC - GH_GAIN_SCALE - 2)) +
((guidance_h_igain * (guidance_h_pos_err_sum.x >> 12)) >> (INT32_POS_FRAC - GH_GAIN_SCALE)) +
((guidance_h_again * guidance_h_accel_ref.x) >> 8); /* feedforward gain */
guidance_h_command_earth.y =
guidance_h_pgain * (guidance_h_pos_err.y >> (INT32_POS_FRAC - GH_GAIN_SCALE)) +
guidance_h_dgain * (guidance_h_speed_err.y >> (INT32_SPEED_FRAC - GH_GAIN_SCALE)) +
guidance_h_igain * (guidance_h_pos_err_sum.y >> (12 + INT32_POS_FRAC - GH_GAIN_SCALE)) +
guidance_h_again * (guidance_h_accel_ref.y >> 8); /* feedforward gain */
((guidance_h_pgain * guidance_h_pos_err.y) >> (INT32_POS_FRAC - GH_GAIN_SCALE)) +
((guidance_h_dgain * (guidance_h_speed_err.y >> 2)) >> (INT32_SPEED_FRAC - GH_GAIN_SCALE - 2)) +
((guidance_h_igain * (guidance_h_pos_err_sum.y >> 12)) >> (INT32_POS_FRAC - GH_GAIN_SCALE)) +
((guidance_h_again * guidance_h_accel_ref.y) >> 8); /* feedforward gain */
VECT2_STRIM(guidance_h_command_earth, -TRAJ_MAX_BANK, TRAJ_MAX_BANK);
sw/airborne/firmwares/rotorcraft/guidance/guidance_h.h
+3 -3
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@@ -49,9 +49,9 @@ extern uint8_t guidance_h_mode;
*/
extern struct Int32Vect2 guidance_h_pos_sp;
extern struct Int32Vect2 guidance_h_pos_ref;
extern struct Int32Vect2 guidance_h_speed_ref;
extern struct Int32Vect2 guidance_h_accel_ref;
extern struct Int32Vect2 guidance_h_pos_ref; ///< with #INT32_POS_FRAC
extern struct Int32Vect2 guidance_h_speed_ref; ///< with #INT32_SPEED_FRAC
extern struct Int32Vect2 guidance_h_accel_ref; ///< with #INT32_ACCEL_FRAC
extern struct Int32Vect2 guidance_h_pos_err;
extern struct Int32Vect2 guidance_h_speed_err;
sw/airborne/firmwares/rotorcraft/guidance/guidance_h_ref.h
+2 -1
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@@ -54,7 +54,8 @@ extern struct Int64Vect2 b2_gh_pos_ref;
/* Saturations definition */
#ifndef GUIDANCE_H_REF_MAX_ACCEL
#define GUIDANCE_H_REF_MAX_ACCEL ( tanf(RadOfDeg(30.))*9.81 )
/* tanf(RadOfDeg(30.))*9.81 = 5.66 */
#define GUIDANCE_H_REF_MAX_ACCEL 5.66
#endif
#define B2_GH_MAX_ACCEL BFP_OF_REAL(GUIDANCE_H_REF_MAX_ACCEL, B2_GH_ACCEL_REF_FRAC)
sw/airborne/firmwares/rotorcraft/navigation.c
+2
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@@ -123,6 +123,7 @@ void nav_run(void) {
VECT2_STRIM(path_to_waypoint, -(1<<15), (1<<15));
#if !GUIDANCE_H_USE_REF
PRINT_CONFIG_MSG("NOT using horizontal guidance reference :-(")
int32_t dist_to_waypoint;
INT32_VECT2_NORM(dist_to_waypoint, path_to_waypoint);
@@ -136,6 +137,7 @@ void nav_run(void) {
VECT2_SUM(navigation_carrot, path_to_carrot, *stateGetPositionEnu_i());
}
#else
PRINT_CONFIG_MSG("Using horizontal guidance reference :-)")
// if H_REF is used, CARROT_DIST is not used
VECT2_COPY(navigation_carrot, navigation_target);
#endif