ahrs_float_mlkf.h File Reference

Multiplicative linearized Kalman Filter in quaternion formulation. More...

#include "std.h"
#include "math/pprz_algebra_float.h"
#include "math/pprz_orientation_conversion.h"

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Data Structures
struct	AhrsMlkf

Enumerations
enum	AhrsMlkfStatus { AHRS_MLKF_UNINIT , AHRS_MLKF_RUNNING }

Functions
void	ahrs_mlkf_init (void)
bool	ahrs_mlkf_align (struct FloatRates *lp_gyro, struct FloatVect3 *lp_accel, struct FloatVect3 *lp_mag)
void	ahrs_mlkf_propagate (struct FloatRates *gyro, float dt)
void	ahrs_mlkf_update_accel (struct FloatVect3 *accel)
void	ahrs_mlkf_update_mag (struct FloatVect3 *mag)
void	ahrs_mlkf_update_mag_2d (struct FloatVect3 *mag)
void	ahrs_mlkf_update_mag_full (struct FloatVect3 *mag)

Variables
struct AhrsMlkf	ahrs_mlkf

Detailed Description

Multiplicative linearized Kalman Filter in quaternion formulation.

Estimate the attitude, heading and gyro bias.

Definition in file ahrs_float_mlkf.h.

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Data Structure Documentation

AhrsMlkf

struct AhrsMlkf

Definition at line 43 of file ahrs_float_mlkf.h.

Collaboration diagram for AhrsMlkf:

Data Fields
struct FloatRates	body_rate	Rotational velocity in body frame.
struct FloatQuat	gibbs_cor
struct FloatRates	gyro_bias
bool	is_aligned
float	lp_accel
struct FloatQuat	ltp_to_body_quat	Rotation from LocalTangentPlane to body frame as unit quaternion.
struct FloatVect3	mag_h
struct FloatVect3	mag_noise
float	P[6][6]
enum AhrsMlkfStatus	status

Enumeration Type Documentation

AhrsMlkfStatus

enum AhrsMlkfStatus

Enumerator
AHRS_MLKF_UNINIT
AHRS_MLKF_RUNNING

Definition at line 38 of file ahrs_float_mlkf.h.

Function Documentation

ahrs_mlkf_align()

bool ahrs_mlkf_align	(	struct FloatRates *	lp_gyro,
		struct FloatVect3 *	lp_accel,
		struct FloatVect3 *	lp_mag
	)

Definition at line 91 of file ahrs_float_mlkf.c.

References ahrs_float_get_quat_from_accel_mag(), ahrs_mlkf, AhrsMlkf::gyro_bias, AhrsMlkf::is_aligned, AhrsMlkf::lp_accel, and AhrsMlkf::ltp_to_body_quat.

Referenced by aligner_cb().

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ahrs_mlkf_init()

void ahrs_mlkf_init

(

void

)

Definition at line 62 of file ahrs_float_mlkf.c.

References AHRS_MAG_NOISE_X, AHRS_MAG_NOISE_Y, AHRS_MAG_NOISE_Z, ahrs_mlkf, AhrsMlkf::body_rate, float_quat_identity(), FLOAT_RATES_ZERO, AhrsMlkf::gyro_bias, AhrsMlkf::is_aligned, AhrsMlkf::ltp_to_body_quat, AhrsMlkf::mag_h, AhrsMlkf::mag_noise, AhrsMlkf::P, and VECT3_ASSIGN.

Referenced by ahrs_mlkf_wrapper_init().

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ahrs_mlkf_propagate()

void ahrs_mlkf_propagate	(	struct FloatRates *	gyro,
		float	dt
	)

Definition at line 106 of file ahrs_float_mlkf.c.

References propagate_ref(), and propagate_state().

Referenced by gyro_cb().

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ahrs_mlkf_update_accel()

void ahrs_mlkf_update_accel

(

struct FloatVect3 *

accel

)

Definition at line 112 of file ahrs_float_mlkf.c.

References ahrs_mlkf, alpha, dn, float_vect3_norm(), AhrsMlkf::lp_accel, reset_state(), and update_state().

Referenced by accel_cb().

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ahrs_mlkf_update_mag()

void ahrs_mlkf_update_mag

(

struct FloatVect3 *

mag

)

Definition at line 125 of file ahrs_float_mlkf.c.

References ahrs_mlkf_update_mag_2d(), and ahrs_mlkf_update_mag_full().

Referenced by mag_cb().

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ahrs_mlkf_update_mag_2d()

void ahrs_mlkf_update_mag_2d

(

struct FloatVect3 *

mag

)

Definition at line 134 of file ahrs_float_mlkf.c.

References ahrs_mlkf, AhrsMlkf::mag_h, AhrsMlkf::mag_noise, reset_state(), and update_state_heading().

Referenced by ahrs_mlkf_update_mag().

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ahrs_mlkf_update_mag_full()

void ahrs_mlkf_update_mag_full

(

struct FloatVect3 *

mag

)

Definition at line 140 of file ahrs_float_mlkf.c.

References ahrs_mlkf, AhrsMlkf::mag_h, AhrsMlkf::mag_noise, reset_state(), and update_state().

Referenced by ahrs_mlkf_update_mag().

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Variable Documentation

ahrs_mlkf

struct AhrsMlkf ahrs_mlkf

extern

Definition at line 57 of file ahrs_float_mlkf.c.

Referenced by accel_cb(), ahrs_mlkf_align(), ahrs_mlkf_init(), ahrs_mlkf_update_accel(), ahrs_mlkf_update_mag_2d(), ahrs_mlkf_update_mag_full(), aligner_cb(), geo_mag_cb(), gyro_cb(), mag_cb(), propagate_ref(), propagate_state(), reset_state(), send_bias(), send_euler(), send_filter_status(), send_geo_mag(), set_body_state_from_quat(), update_state(), and update_state_heading().