vf_extended_float.h File Reference

Interface for extended vertical filter (in float). More...

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Data Structures
struct	VffExtended

Macros
#define	VFF_STATE_SIZE   4

Functions
void	vff_init_zero (void)
void	vff_init (float z, float zdot, float accel_bias, float baro_offset)
void	vff_propagate (float accel, float dt)
	Propagate the filter in time. More...
void	vff_update_baro (float z_meas)
void	vff_update_z (float z_meas)
void	vff_update_offset (float offset)
void	vff_update_baro_conf (float z_meas, float conf)
void	vff_update_z_conf (float z_meas, float conf)
void	vff_realign (float z_meas)

Variables
struct VffExtended	vff

Detailed Description

Interface for extended vertical filter (in float).

Definition in file vf_extended_float.h.

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Data Structure Documentation

struct VffExtended

Definition at line 35 of file vf_extended_float.h.

Data Fields
float	bias	accel bias estimate in m/s^2
float	offset	baro offset estimate
float	P[VFF_STATE_SIZE][VFF_STATE_SIZE]	covariance matrix
float	z	z-position estimate in m (NED, z-down)
float	z_meas	last z measurement in m
float	z_meas_baro	last z measurement from baro in m
float	zdot	z-velocity estimate in m/s (NED, z-down)
float	zdotdot	z-acceleration in m/s^2 (NED, z-down)

Macro Definition Documentation

#define VFF_STATE_SIZE   4

Definition at line 33 of file vf_extended_float.h.

Referenced by vff_init().

Function Documentation

void vff_init	(	float	z,
		float	zdot,
		float	accel_bias,
		float	baro_offset
	)

Definition at line 85 of file vf_extended_float.c.

References VffExtended::bias, DefaultPeriodic, VffExtended::offset, VffExtended::P, register_periodic_telemetry(), vff, VFF_EXTENDED_INIT_PXX, VFF_STATE_SIZE, VffExtended::z, and VffExtended::zdot.

Referenced by vff_init_zero(), and vff_realign().

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void vff_init_zero

(

void

)

Definition at line 80 of file vf_extended_float.c.

void vff_propagate	(	float	accel,
		float	dt
	)

Propagate the filter in time.

F = [ 1 dt -dt^2/2 0 0 1 -dt 0 0 0 1 0 0 0 0 1 ];

B = [ dt^2/2 dt 0 0]';

Q = [ Qzz 0 0 0 0 Qzdotzdot 0 0 0 0 Qbiasbias 0 0 0 0 0 Qoffoff ];

Qzz = VFF_EXTENDED_ACCEL_NOISE * DT_VFILTER * DT_VFILTER / 2. Qzdotzdot = VFF_EXTENDED_ACCEL_NOISE * DT_VFILTER

Xk1 = F * Xk0 + B * accel;

Pk1 = F * Pk0 * F' + Q;

F = [ 1 dt -dt^2/2 0 1 -dt 0 0 1 ];

B = [ dt^2/2 dt 0]';

Q = [ 0.01 0 0 0 0.01 0 0 0 0.001 ];

Xk1 = F * Xk0 + B * accel;

Pk1 = F * Pk0 * F' + Q;

Definition at line 127 of file vf_extended_float.c.

void vff_realign

(

float

z_meas

)

Definition at line 347 of file vf_extended_float.c.

void vff_update_baro

(

float

z_meas

)

Definition at line 216 of file vf_extended_float.c.

References R_BARO, and update_baro_conf().

Referenced by baro_cb().

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void vff_update_baro_conf	(	float	z_meas,
		float	conf
	)

Definition at line 221 of file vf_extended_float.c.

References update_baro_conf().

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void vff_update_offset

(

float

offset

)

Definition at line 341 of file vf_extended_float.c.

References R_OFFSET, and update_offset_conf().

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void vff_update_z

(

float

z_meas

)

Definition at line 279 of file vf_extended_float.c.

References R_ALT, and update_alt_conf().

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void vff_update_z_conf	(	float	z_meas,
		float	conf
	)

Definition at line 284 of file vf_extended_float.c.

Variable Documentation

struct VffExtended vff

Definition at line 66 of file vf_extended_float.c.