File Coverage

erfasrc/src/pvtob.c

Criterion	Covered	Total	%
statement	0	16	0.0
branch			n/a
condition			n/a
subroutine			n/a
pod			n/a
total	0	16	0.0

line	stmt	code
1		#include "erfa.h"
2
3	0	void eraPvtob(double elong, double phi, double hm,
4		double xp, double yp, double sp, double theta,
5		double pv[2][3])
6		/*
7		** - - - - - - - - -
8		** e r a P v t o b
9		** - - - - - - - - -
10		**
11		** Position and velocity of a terrestrial observing station.
12		**
13		** Given:
14		** elong double longitude (radians, east +ve, Note 1)
15		** phi double latitude (geodetic, radians, Note 1)
16		** hm double height above ref. ellipsoid (geodetic, m)
17		** xp,yp double coordinates of the pole (radians, Note 2)
18		** sp double the TIO locator s' (radians, Note 2)
19		** theta double Earth rotation angle (radians, Note 3)
20		**
21		** Returned:
22		** pv double[2][3] position/velocity vector (m, m/s, CIRS)
23		**
24		** Notes:
25		**
26		** 1) The terrestrial coordinates are with respect to the ERFA_WGS84
27		** reference ellipsoid.
28		**
29		** 2) xp and yp are the coordinates (in radians) of the Celestial
30		** Intermediate Pole with respect to the International Terrestrial
31		** Reference System (see IERS Conventions), measured along the
32		** meridians 0 and 90 deg west respectively. sp is the TIO locator
33		** s', in radians, which positions the Terrestrial Intermediate
34		** Origin on the equator. For many applications, xp, yp and
35		** (especially) sp can be set to zero.
36		**
37		** 3) If theta is Greenwich apparent sidereal time instead of Earth
38		** rotation angle, the result is with respect to the true equator
39		** and equinox of date, i.e. with the x-axis at the equinox rather
40		** than the celestial intermediate origin.
41		**
42		** 4) The velocity units are meters per UT1 second, not per SI second.
43		** This is unlikely to have any practical consequences in the modern
44		** era.
45		**
46		** 5) No validation is performed on the arguments. Error cases that
47		** could lead to arithmetic exceptions are trapped by the eraGd2gc
48		** function, and the result set to zeros.
49		**
50		** References:
51		**
52		** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003),
53		** IERS Technical Note No. 32, BKG (2004)
54		**
55		** Urban, S. & Seidelmann, P. K. (eds), Explanatory Supplement to
56		** the Astronomical Almanac, 3rd ed., University Science Books
57		** (2013), Section 7.4.3.3.
58		**
59		** Called:
60		** eraGd2gc geodetic to geocentric transformation
61		** eraPom00 polar motion matrix
62		** eraTrxp product of transpose of r-matrix and p-vector
63		**
64		** Copyright (C) 2013-2020, NumFOCUS Foundation.
65		** Derived, with permission, from the SOFA library. See notes at end of file.
66		*/
67		{
68		/* Earth rotation rate in radians per UT1 second */
69		const double OM = 1.00273781191135448 * ERFA_D2PI / ERFA_DAYSEC;
70
71		double xyzm[3], rpm[3][3], xyz[3], x, y, z, s, c;
72
73
74		/* Geodetic to geocentric transformation (ERFA_WGS84). */
75	0	(void) eraGd2gc(1, elong, phi, hm, xyzm);
76
77		/* Polar motion and TIO position. */
78	0	eraPom00(xp, yp, sp, rpm);
79	0	eraTrxp(rpm, xyzm, xyz);
80	0	x = xyz[0];
81	0	y = xyz[1];
82	0	z = xyz[2];
83
84		/* Functions of ERA. */
85	0	s = sin(theta);
86	0	c = cos(theta);
87
88		/* Position. */
89	0	pv[0][0] = cx - sy;
90	0	pv[0][1] = sx + cy;
91	0	pv[0][2] = z;
92
93		/* Velocity. */
94	0	pv[1][0] = OM * ( -sx - cy );
95	0	pv[1][1] = OM * ( cx - sy );
96	0	pv[1][2] = 0.0;
97
98		/* Finished. */
99
100	0	}
101		/*----------------------------------------------------------------------
102		**
103		**
104		** Copyright (C) 2013-2020, NumFOCUS Foundation.
105		** All rights reserved.
106		**
107		** This library is derived, with permission, from the International
108		** Astronomical Union's "Standards of Fundamental Astronomy" library,
109		** available from http://www.iausofa.org.
110		**
111		** The ERFA version is intended to retain identical functionality to
112		** the SOFA library, but made distinct through different function and
113		** file names, as set out in the SOFA license conditions. The SOFA
114		** original has a role as a reference standard for the IAU and IERS,
115		** and consequently redistribution is permitted only in its unaltered
116		** state. The ERFA version is not subject to this restriction and
117		** therefore can be included in distributions which do not support the
118		** concept of "read only" software.
119		**
120		** Although the intent is to replicate the SOFA API (other than
121		** replacement of prefix names) and results (with the exception of
122		** bugs; any that are discovered will be fixed), SOFA is not
123		** responsible for any errors found in this version of the library.
124		**
125		** If you wish to acknowledge the SOFA heritage, please acknowledge
126		** that you are using a library derived from SOFA, rather than SOFA
127		** itself.
128		**
129		**
130		** TERMS AND CONDITIONS
131		**
132		** Redistribution and use in source and binary forms, with or without
133		** modification, are permitted provided that the following conditions
134		** are met:
135		**
136		** 1 Redistributions of source code must retain the above copyright
137		** notice, this list of conditions and the following disclaimer.
138		**
139		** 2 Redistributions in binary form must reproduce the above copyright
140		** notice, this list of conditions and the following disclaimer in
141		** the documentation and/or other materials provided with the
142		** distribution.
143		**
144		** 3 Neither the name of the Standards Of Fundamental Astronomy Board,
145		** the International Astronomical Union nor the names of its
146		** contributors may be used to endorse or promote products derived
147		** from this software without specific prior written permission.
148		**
149		** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
150		** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
151		** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
152		** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
153		** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
154		** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
155		** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
156		** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
157		** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
158		** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
159		** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
160		** POSSIBILITY OF SUCH DAMAGE.
161		**
162		*/