1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
SUBROUTINE slPVOB (P, H, STL, PV)
*+
* - - - - - -
* P V O B
* - - - - - -
*
* Position and velocity of an observing station (double precision)
*
* Given:
* P dp latitude (geodetic, radians)
* H dp height above reference spheroid (geodetic, metres)
* STL dp local apparent sidereal time (radians)
*
* Returned:
* PV dp(6) position/velocity 6-vector (AU, AU/s, true equator
* and equinox of date)
*
* Called: slGEOC
*
* IAU 1976 constants are used.
*
* P.T.Wallace Starlink 14 November 1994
*
* Copyright (C) 1995 Rutherford Appleton Laboratory
*
* License:
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see SLA_CONDITIONS); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*
* Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
*-
IMPLICIT NONE
DOUBLE PRECISION P,H,STL,PV(6)
DOUBLE PRECISION R,Z,S,C,V
* Mean sidereal rate (at J2000) in radians per (UT1) second
DOUBLE PRECISION SR
PARAMETER (SR=7.292115855306589D-5)
* Geodetic to geocentric conversion
CALL slGEOC(P,H,R,Z)
* Functions of ST
S=SIN(STL)
C=COS(STL)
* Speed
V=SR*R
* Position
PV(1)=R*C
PV(2)=R*S
PV(3)=Z
* Velocity
PV(4)=-V*S
PV(5)=V*C
PV(6)=0D0
END
|
