#include "sofa.h" void iauPvtob(double elong, double phi, double hm, double xp, double yp, double sp, double theta, double pv[2][3]) /* ** - - - - - - - - - ** i a u P v t o b ** - - - - - - - - - ** ** Position and velocity of a terrestrial observing station. ** ** This function is part of the International Astronomical Union's ** SOFA (Standards of Fundamental Astronomy) software collection. ** ** Status: support function. ** ** Given: ** elong double longitude (radians, east +ve, Note 1) ** phi double latitude (geodetic, radians, Note 1) ** hm double height above ref. ellipsoid (geodetic, m) ** xp,yp double coordinates of the pole (radians, Note 2) ** sp double the TIO locator s' (radians, Note 2) ** theta double Earth rotation angle (radians, Note 3) ** ** Returned: ** pv double[2][3] position/velocity vector (m, m/s, CIRS) ** ** Notes: ** ** 1) The terrestrial coordinates are with respect to the WGS84 ** reference ellipsoid. ** ** 2) xp and yp are the coordinates (in radians) of the Celestial ** Intermediate Pole with respect to the International Terrestrial ** Reference System (see IERS Conventions), measured along the ** meridians 0 and 90 deg west respectively. sp is the TIO locator ** s', in radians, which positions the Terrestrial Intermediate ** Origin on the equator. For many applications, xp, yp and ** (especially) sp can be set to zero. ** ** 3) If theta is Greenwich apparent sidereal time instead of Earth ** rotation angle, the result is with respect to the true equator ** and equinox of date, i.e. with the x-axis at the equinox rather ** than the celestial intermediate origin. ** ** 4) The velocity units are meters per UT1 second, not per SI second. ** This is unlikely to have any practical consequences in the modern ** era. ** ** 5) No validation is performed on the arguments. Error cases that ** could lead to arithmetic exceptions are trapped by the iauGd2gc ** function, and the result set to zeros. ** ** References: ** ** McCarthy, D. D., Petit, G. (eds.), IERS Conventions (2003), ** IERS Technical Note No. 32, BKG (2004) ** ** Urban, S. & Seidelmann, P. K. (eds), Explanatory Supplement to ** the Astronomical Almanac, 3rd ed., University Science Books ** (2013), Section 7.4.3.3. ** ** Called: ** iauGd2gc geodetic to geocentric transformation ** iauPom00 polar motion matrix ** iauTrxp product of transpose of r-matrix and p-vector ** ** This revision: 2013 October 9 ** ** SOFA release 2018-01-30 ** ** Copyright (C) 2018 IAU SOFA Board. See notes at end. */ { /* Earth rotation rate in radians per UT1 second */ const double OM = 1.00273781191135448 * D2PI / DAYSEC; double xyzm[3], rpm[3][3], xyz[3], x, y, z, s, c; /* Geodetic to geocentric transformation (WGS84). */ (void) iauGd2gc(1, elong, phi, hm, xyzm); /* Polar motion and TIO position. */ iauPom00(xp, yp, sp, rpm); iauTrxp(rpm, xyzm, xyz); x = xyz[0]; y = xyz[1]; z = xyz[2]; /* Functions of ERA. */ s = sin(theta); c = cos(theta); /* Position. */ pv[0][0] = c*x - s*y; pv[0][1] = s*x + c*y; pv[0][2] = z; /* Velocity. */ pv[1][0] = OM * ( -s*x - c*y ); pv[1][1] = OM * ( c*x - s*y ); pv[1][2] = 0.0; /* Finished. */ /*---------------------------------------------------------------------- ** ** Copyright (C) 2018 ** Standards Of Fundamental Astronomy Board ** of the International Astronomical Union. ** ** ===================== ** SOFA Software License ** ===================== ** ** NOTICE TO USER: ** ** BY USING THIS SOFTWARE YOU ACCEPT THE FOLLOWING SIX TERMS AND ** CONDITIONS WHICH APPLY TO ITS USE. ** ** 1. The Software is owned by the IAU SOFA Board ("SOFA"). ** ** 2. Permission is granted to anyone to use the SOFA software for any ** purpose, including commercial applications, free of charge and ** without payment of royalties, subject to the conditions and ** restrictions listed below. ** ** 3. You (the user) may copy and distribute SOFA source code to others, ** and use and adapt its code and algorithms in your own software, ** on a world-wide, royalty-free basis. That portion of your ** distribution that does not consist of intact and unchanged copies ** of SOFA source code files is a "derived work" that must comply ** with the following requirements: ** ** a) Your work shall be marked or carry a statement that it ** (i) uses routines and computations derived by you from ** software provided by SOFA under license to you; and ** (ii) does not itself constitute software provided by and/or ** endorsed by SOFA. ** ** b) The source code of your derived work must contain descriptions ** of how the derived work is based upon, contains and/or differs ** from the original SOFA software. ** ** c) The names of all routines in your derived work shall not ** include the prefix "iau" or "sofa" or trivial modifications ** thereof such as changes of case. ** ** d) The origin of the SOFA components of your derived work must ** not be misrepresented; you must not claim that you wrote the ** original software, nor file a patent application for SOFA ** software or algorithms embedded in the SOFA software. ** ** e) These requirements must be reproduced intact in any source ** distribution and shall apply to anyone to whom you have ** granted a further right to modify the source code of your ** derived work. ** ** Note that, as originally distributed, the SOFA software is ** intended to be a definitive implementation of the IAU standards, ** and consequently third-party modifications are discouraged. All ** variations, no matter how minor, must be explicitly marked as ** such, as explained above. ** ** 4. You shall not cause the SOFA software to be brought into ** disrepute, either by misuse, or use for inappropriate tasks, or ** by inappropriate modification. ** ** 5. The SOFA software is provided "as is" and SOFA makes no warranty ** as to its use or performance. SOFA does not and cannot warrant ** the performance or results which the user may obtain by using the ** SOFA software. SOFA makes no warranties, express or implied, as ** to non-infringement of third party rights, merchantability, or ** fitness for any particular purpose. In no event will SOFA be ** liable to the user for any consequential, incidental, or special ** damages, including any lost profits or lost savings, even if a ** SOFA representative has been advised of such damages, or for any ** claim by any third party. ** ** 6. The provision of any version of the SOFA software under the terms ** and conditions specified herein does not imply that future ** versions will also be made available under the same terms and ** conditions. * ** In any published work or commercial product which uses the SOFA ** software directly, acknowledgement (see www.iausofa.org) is ** appreciated. ** ** Correspondence concerning SOFA software should be addressed as ** follows: ** ** By email: sofa@ukho.gov.uk ** By post: IAU SOFA Center ** HM Nautical Almanac Office ** UK Hydrographic Office ** Admiralty Way, Taunton ** Somerset, TA1 2DN ** United Kingdom ** **--------------------------------------------------------------------*/ }