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75 lines
1.9 KiB
Fortran
75 lines
1.9 KiB
Fortran
SUBROUTINE sla_DS2C6 (A, B, R, AD, BD, RD, V)
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*+
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* - - - - - -
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* D S 2 C 6
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* - - - - - -
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*
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* Conversion of position & velocity in spherical coordinates
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* to Cartesian coordinates
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*
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* (double precision)
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*
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* Given:
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* A dp longitude (radians)
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* B dp latitude (radians)
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* R dp radial coordinate
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* AD dp longitude derivative (radians per unit time)
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* BD dp latitude derivative (radians per unit time)
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* RD dp radial derivative
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*
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* Returned:
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* V dp(6) Cartesian position & velocity vector
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*
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* P.T.Wallace Starlink 10 July 1993
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*
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* Copyright (C) 1995 Rutherford Appleton Laboratory
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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DOUBLE PRECISION A,B,R,AD,BD,RD,V(6)
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DOUBLE PRECISION SA,CA,SB,CB,RCB,X,Y,RBD,W
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* Useful functions
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SA=SIN(A)
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CA=COS(A)
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SB=SIN(B)
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CB=COS(B)
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RCB=R*CB
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X=RCB*CA
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Y=RCB*SA
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RBD=R*BD
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W=RBD*SB-CB*RD
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* Position
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V(1)=X
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V(2)=Y
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V(3)=R*SB
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* Velocity
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V(4)=-Y*AD-W*CA
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V(5)=X*AD-W*SA
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V(6)=RBD*CB+SB*RD
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END
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