MRTKLIB Atmosphere Module — Ionospheric and tropospheric models. More...

#include "mrtklib/mrtk_coords.h"
#include "mrtklib/mrtk_foundation.h"
#include "mrtklib/mrtk_nav.h"
#include "mrtklib/mrtk_opt.h"
#include "mrtklib/mrtk_time.h"

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Functions
double	ionmodel (gtime_t t, const double ion, const double pos, const double *azel)
	Compute ionospheric delay by broadcast ionosphere model (Klobuchar).
double	ionmapf (const double pos, const double azel)
	Compute ionospheric delay mapping function by single layer model.
double	ionppp (const double pos, const double azel, double re, double hion, double *posp)
	Compute ionospheric pierce point (IPP) position and slant factor.
double	tropmodel (gtime_t time, const double pos, const double azel, double humi)
	Compute tropospheric delay by standard atmosphere and Saastamoinen.
double	tropmapf (gtime_t time, const double pos, const double azel, double *mapfw)
	Compute tropospheric mapping function by NMF.
int	ionocorr (gtime_t time, const nav_t nav, int sat, const double pos, const double azel, int ionoopt, double ion, double *var)
	Compute ionospheric correction.
int	tropcorr (gtime_t time, const nav_t nav, const double pos, const double azel, int tropopt, double trp, double *var)
	Compute tropospheric correction.

Detailed Description

MRTKLIB Atmosphere Module — Ionospheric and tropospheric models.

This header provides broadcast ionosphere (Klobuchar) model, ionospheric mapping function, ionospheric pierce point computation, tropospheric (Saastamoinen) model, and tropospheric mapping function (NMF/GMF).

Note: All functions in this module are pure cut-and-paste extractions from rtkcmn.c with zero algorithmic changes.

Definition in file mrtk_atmos.h.

Function Documentation

◆ ionmapf()

double ionmapf	(	const double *	pos,
		const double *	azel )

Compute ionospheric delay mapping function by single layer model.

Parameters

[in]	pos	Receiver position {lat,lon,h} (rad,m)
[in]	azel	Azimuth/elevation angle {az,el} (rad)

Returns: Ionospheric mapping function

Definition at line 114 of file mrtk_atmos.c.

References HION, PI, and RE_WGS84.

Referenced by ddres(), ddres(), and ddres().

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◆ ionmodel()

double ionmodel	(	gtime_t	t,
		const double *	ion,
		const double *	pos,
		const double *	azel )

Compute ionospheric delay by broadcast ionosphere model (Klobuchar).

Parameters

[in]	t	Time (GPST)
[in]	ion	Iono model parameters {a0,a1,a2,a3,b0,b1,b2,b3}
[in]	pos	Receiver position {lat,lon,h} (rad,m)
[in]	azel	Azimuth/elevation angle {az,el} (rad)

Returns: Ionospheric delay (L1) (m)

Definition at line 63 of file mrtk_atmos.c.

References CLIGHT, norm(), PI, and time2gpst().

Referenced by ionocorr().

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◆ ionocorr()

int ionocorr	(	gtime_t	time,
		const nav_t *	nav,
		int	sat,
		const double *	pos,
		const double *	azel,
		int	ionoopt,
		double *	ion,
		double *	var )

Compute ionospheric correction.

Parameters

[in]	time	Time
[in]	nav	Navigation data
[in]	sat	Satellite number
[in]	pos	Receiver position {lat,lon,h} (rad\|m)
[in]	azel	Azimuth/elevation angle {az,el} (rad)
[in]	ionoopt	Ionospheric correction option (IONOOPT_???)
[out]	ion	Ionospheric delay (L1) (m)
[out]	var	Ionospheric delay (L1) variance (m^2)

Returns: Status (1:ok, 0:error)

Definition at line 310 of file mrtk_atmos.c.

References ERR_BRDCI, ERR_ION, nav_s::ion_gps, nav_s::ion_qzs, ionmodel(), IONOOPT_BRDC, IONOOPT_OFF, IONOOPT_QZS, IONOOPT_SBAS, IONOOPT_TEC, iontec(), norm(), R2D, sbsioncorr(), SQR, time_str(), and trace().

Referenced by rescode().

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◆ ionppp()

double ionppp	(	const double *	pos,
		const double *	azel,
		double	re,
		double	hion,
		double *	posp )

Compute ionospheric pierce point (IPP) position and slant factor.

Parameters

[in]	pos	Receiver position {lat,lon,h} (rad,m)
[in]	azel	Azimuth/elevation angle {az,el} (rad)
[in]	re	Earth radius (km)
[in]	hion	Altitude of ionosphere (km)
[out]	posp	Pierce point position {lat,lon,h} (rad,m)

Returns: Slant factor

Note: Only valid on the earth surface.

Definition at line 131 of file mrtk_atmos.c.

References D2R, and PI.

Referenced by iondelay(), and sbsioncorr().

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◆ tropcorr()

int tropcorr	(	gtime_t	time,
		const nav_t *	nav,
		const double *	pos,
		const double *	azel,
		int	tropopt,
		double *	trp,
		double *	var )

Compute tropospheric correction.

Parameters

[in]	time	Time
[in]	nav	Navigation data
[in]	pos	Receiver position {lat,lon,h} (rad\|m)
[in]	azel	Azimuth/elevation angle {az,el} (rad)
[in]	tropopt	Tropospheric correction option (TROPOPT_???)
[out]	trp	Tropospheric delay (m)
[out]	var	Tropospheric delay variance (m^2)

Returns: Status (1:ok, 0:error)

Definition at line 350 of file mrtk_atmos.c.

References ERR_SAAS, ERR_TROP, R2D, REL_HUMI, sbstropcorr(), SQR, time_str(), trace(), tropmodel(), TROPOPT_EST, TROPOPT_ESTG, TROPOPT_OFF, TROPOPT_SAAS, and TROPOPT_SBAS.

Referenced by rescode().

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◆ tropmapf()

double tropmapf	(	gtime_t	time,
		const double *	pos,
		const double *	azel,
		double *	mapfw )

Compute tropospheric mapping function by NMF.

Parameters

[in]	time	Time
[in]	pos	Receiver position {lat,lon,h} (rad,m)
[in]	azel	Azimuth/elevation angle {az,el} (rad)
[in,out]	mapfw	Wet mapping function (NULL: not output)

Returns: Dry mapping function

Note: See ref [5] (NMF) and [9] (GMF).

◆ tropmodel()

double tropmodel	(	gtime_t	time,
		const double *	pos,
		const double *	azel,
		double	humi )

Compute tropospheric delay by standard atmosphere and Saastamoinen.

Parameters

[in]	time	Time
[in]	pos	Receiver position {lat,lon,h} (rad,m)
[in]	azel	Azimuth/elevation angle {az,el} (rad)
[in]	humi	Relative humidity

Returns: Tropospheric delay (m)

Definition at line 162 of file mrtk_atmos.c.

References PI.

Referenced by corr_trop_distwgt(), corr_trop_plane(), decode_lcltrop(), encode_lcltrop(), tropcorr(), zdres(), and zdres().

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Functions

Detailed Description

Function Documentation

◆ ionmapf()

◆ ionmodel()

◆ ionocorr()

◆ ionppp()

◆ tropcorr()

◆ tropmapf()

◆ tropmodel()