Parallax calculators

Functions
DLL_EXPORT double *	vlbi_matrix_calc_baseline_center (double *loc1, double *loc2)
	Return The baseline center in geographic coordinates. More...
DLL_EXPORT double *	vlbi_matrix_calc_3d_projection (double alt, double az, double *baseline)
	Return The 3d projection of the current observation. More...
DLL_EXPORT double *	vlbi_matrix_calc_parametric_projection (double *target, double *baseline)
	Return The parametric projection of the current observation. More...
DLL_EXPORT double *	vlbi_matrix_calc_uv_coordinates (double *proj, double wavelength)
	Return The UV coordinates of the current observation. More...
DLL_EXPORT double *	vlbi_matrix_calc_location (double *loc)
	Convert geographic location into xyz location. More...
DLL_EXPORT double	vlbi_matrix_estimate_geocentric_elevation (double latitude, double sea_level_elevation)
	Returns an estimation of the actual geocentric elevation. More...
DLL_EXPORT double	vlbi_matrix_estimate_resolution_zero (double frequency)
	Estimate the angular resolution of a 1 meter baseline at a given frequency. More...
DLL_EXPORT double	vlbi_matrix_estimate_resolution (double resolution0, double baseline)
	Estimate Signal to noise ratio after a given integration time. More...

Detailed Description

Function Documentation

vlbi_matrix_calc_3d_projection()

DLL_EXPORT double* vlbi_matrix_calc_3d_projection	(	double	alt,
		double	az,
		double *	baseline
	)

Parameters

alt	The altitude of the target.
az	The azimuth of the target.
baseline	The current baseline in meters.

Returns

double* The 3d projection of the current observation.

vlbi_matrix_calc_baseline_center()

DLL_EXPORT double* vlbi_matrix_calc_baseline_center	(	double *	loc1,
		double *	loc2
	)

Parameters

loc1	The first location.
loc2	The second location.

Returns

double* The center of the given coordinates

vlbi_matrix_calc_location()

DLL_EXPORT double* vlbi_matrix_calc_location

(

double *

loc

)

Parameters

loc	The location of the observer.

Returns

double* The xyz location.

vlbi_matrix_calc_parametric_projection()

DLL_EXPORT double* vlbi_matrix_calc_parametric_projection	(	double *	target,
		double *	baseline
	)

Parameters

target	The alt/az/dist coordinates of the target into a 3 element vector.
baseline	The current baseline in meters.

Returns

double* The 3d projection of the current observation.

vlbi_matrix_calc_uv_coordinates()

DLL_EXPORT double* vlbi_matrix_calc_uv_coordinates	(	double *	proj,
		double	wavelength
	)

Parameters

proj	The 2d projection of the current baseline perspective distance.
wavelength	The wavelength observed.

Returns

double* The 2d coordinates of the current observation and the delay time as 3rd array element.

vlbi_matrix_estimate_geocentric_elevation()

DLL_EXPORT double vlbi_matrix_estimate_geocentric_elevation	(	double	latitude,
		double	sea_level_elevation
	)

Parameters

latitude	latitude in INDI format (-90 to +90)
sea_level_elevation	sea level elevation

Returns

Aproximated geocentric elevation

vlbi_matrix_estimate_resolution()

DLL_EXPORT double vlbi_matrix_estimate_resolution	(	double	resolution0,
		double	baseline
	)

Parameters

resolution0	Resolution at baseline 0 (1m).
baseline	Current baseline.

Returns

double The resolution at the given baseline

vlbi_matrix_estimate_resolution_zero()

DLL_EXPORT double vlbi_matrix_estimate_resolution_zero

(

double

frequency

)

Parameters

frequency

Observed frequency.

Returns

double The resolution at the baseline 0 (1m)