mrtk_astro.c File Reference

MRTKLIB Astronomy Module — Implementation. More...

#include "mrtklib/mrtk_astro.h"
#include <math.h>
#include "mrtklib/mrtk_coords.h"
#include "mrtklib/mrtk_mat.h"
#include "mrtklib/mrtk_trace.h"

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Macros
#define	PI   3.1415926535897932 /* pi */
#define	D2R   (PI / 180.0) /* deg to rad */
#define	AS2R   (D2R / 3600.0) /* arc sec to radian */
#define	AU   149597870691.0 /* 1 AU (m) */
#define	RE_WGS84   6378137.0 /* earth semimajor axis (WGS84) (m) */

Functions
static void	ast_args (double t, double *f)
void	sunmoonpos_eci (gtime_t tut, double *rsun, double *rmoon)
	Compute sun and moon position in ECI.
void	sunmoonpos (gtime_t tutc, const double *erpv, double *rsun, double *rmoon, double *gmst)
	Compute sun and moon position in ECEF.

Detailed Description

MRTKLIB Astronomy Module — Implementation.

All functions and static data in this file are cut-and-paste extractions from the legacy rtkcmn.c with zero algorithmic changes.

Definition in file mrtk_astro.c.

Macro Definition Documentation

AS2R

#define AS2R   (D2R / 3600.0) /* arc sec to radian */

Definition at line 42 of file mrtk_astro.c.

AU

#define AU   149597870691.0 /* 1 AU (m) */

Definition at line 43 of file mrtk_astro.c.

Referenced by sunmoonpos_eci().

D2R

#define D2R   (PI / 180.0) /* deg to rad */

Definition at line 41 of file mrtk_astro.c.

PI

#define PI   3.1415926535897932 /* pi */

Definition at line 40 of file mrtk_astro.c.

RE_WGS84

#define RE_WGS84   6378137.0 /* earth semimajor axis (WGS84) (m) */

Definition at line 44 of file mrtk_astro.c.

Function Documentation

ast_args()

void ast_args ( double t, double * f )

static

Definition at line 51 of file mrtk_astro.c.

References AS2R, and PI.

Referenced by sunmoonpos_eci().

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sunmoonpos()

void sunmoonpos ( gtime_t tutc, const double * erpv, double * rsun, double * rmoon, double * gmst )

extern

Compute sun and moon position in ECEF.

Parameters

[in]	tutc	Time in UTC (GPST)
[in]	erpv	ERP value {xp,yp,ut1_utc,lod} (rad,rad,s,s/d)
[out]	rsun	Sun position in ECEF (m) (NULL: not output)
[out]	rmoon	Moon position in ECEF (m) (NULL: not output)
[out]	gmst	GMST (rad) (NULL: not output)

Definition at line 135 of file mrtk_astro.c.

References eci2ecef(), matmul(), sunmoonpos_eci(), time_str(), timeadd(), and trace().

Referenced by sat_yaw(), satantoff(), testeclipse(), tidedisp(), and windupcorr().

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sunmoonpos_eci()

void sunmoonpos_eci ( gtime_t tut, double * rsun, double * rmoon )

extern

Compute sun and moon position in ECI.

Parameters

[in]	tut	Time in UT1 (GPST)
[out]	rsun	Sun position in ECI (m) (NULL: not output)
[out]	rmoon	Moon position in ECI (m) (NULL: not output)

Note

See reference [4] 5.1.1, 5.2.1

Definition at line 78 of file mrtk_astro.c.

References ast_args(), AU, D2R, epoch2time(), RE_WGS84, time_str(), timediff(), and trace().

Referenced by sunmoonpos().

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