[IGSMAIL-2848] Navstar GPS Constellation Status
Richard Langley
lang at unb.ca
Sun May 21 19:51:21 PDT 2000
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IGS Electronic Mail 21 May 19:51:30 PDT 2000 Message Number 2848
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Author: Richard B. Langley
Navstar GPS Constellation Status
(00-05-19)
Blk NORAD Orbit Launch
II PRN Internat. Catalog Plane Date
Seq SVN Code ID Number Pos'n (UT) Clock Available/Decommissioned
-------------------------------------------------------------------------------
Block I
01 04 1978-020A 10684 78-02-22 78-03-29 85-07-17
02 07 1978-047A 10893 78-05-13 78-07-14 81-07-16
03 06 1978-093A 11054 78-10-06 78-11-13 92-05-18
04 08 1978-112A 11141 78-12-10 79-01-08 89-10-14
05 05 1980-011A 11690 80-02-09 80-02-27 83-11-28
06 09 1980-032A 11783 80-04-26 80-05-16 91-03-06
07 81-12-18 Launch failure
08 11 1983-072A 14189 83-07-14 83-08-10 93-05-04
09 13 1984-059A 15039 84-06-13 84-07-19 94-06-20
10 12 1984-097A 15271 84-09-08 84-10-03 95-11-18
11 03 1985-093A 16129 85-10-09 85-10-30 94-04-13
Block II
II-1 14 14 1989-013A 19802 89-02-14 89-04-15 00-04-14
II-2 13 02 1989-044A 20061 B-3 89-06-10 Cs 89-08-10 20:46 UT
II-3 16 16 1989-064A 20185 E-5 89-08-18 Rb 89-10-14 20:21 UT
II-4 19 19 1989-085A 20302 A-5 89-10-21 Cs 89-11-23 03:13 UT
II-5 17 17 1989-097A 20361 D-3 89-12-11 Cs 90-01-06 03:30 UT
II-6 18 18 1990-008A 20452 F-3 90-01-24 Cs 90-02-14 22:26 UT
II-7 20 20 1990-025A 20533 90-03-26 90-04-18 96-05-10
II-8 21 21 1990-068A 20724 E-2 90-08-02 Cs 90-08-22 15:00 UT
II-9 15 15 1990-088A 20830 D-5 90-10-01 Cs 90-10-15 00:39 UT
Block IIA
II-10 23 23 1990-103A 20959 E-4 90-11-26 Cs 90-12-10 23:45 UT
II-11 24 24 1991-047A 21552 D-1 91-07-04 Rb 91-08-30 04:44 UT
II-12 25 25 1992-009A 21890 A-2 92-02-23 Cs 92-03-24 11:00 UT
II-13 28 28 1992-019A 21930 92-04-10 92-04-25 97-05
II-14 26 26 1992-039A 22014 F-2 92-07-07 Rb 92-07-23 19:43 UT
II-15 27 27 1992-058A 22108 A-4 92-09-09 Cs 92-09-30 20:08 UT
II-16 32 01 1992-079A 22231 F-4 92-11-22 Cs 92-12-11 14:49 UT
II-17 29 29 1992-089A 22275 F-1 92-12-18 Rb 93-01-05 16:39 UT
II-18 22 22 1993-007A 22446 B-1 93-02-03 Rb 93-04-04 05:20 UT
II-19 31 31 1993-017A 22581 C-3 93-03-30 Cs 93-04-13 20:53 UT
II-20 37 07 1993-032A 22657 C-4 93-05-13 Rb 93-06-12 16:15 UT
II-21 39 09 1993-042A 22700 A-1 93-06-26 Cs 93-07-20 12:54 UT
II-22 35 05 1993-054A 22779 B-4 93-08-30 Cs 93-09-28 19:29 UT
II-23 34 04 1993-068A 22877 D-4 93-10-26 Rb 93-11-22 18:20 UT
II-24 36 06 1994-016A 23027 C-1 94-03-10 Cs 94-03-28 14:20 UT
II-25 33 03 1996-019A 23833 C-2 96-03-28 Cs 96-04-09 21:17 UT
II-26 40 10 1996-041A 23953 E-3 96-07-16 Cs 96-08-15 15:05 UT
II-27 30 30 1996-056A 24320 B-2 96-09-12 Cs 96-10-01 15:28 UT
II-28 38 08 1997-067A 25030 A-3 97-11-06 Rb 97-12-18 15:24 UT
Block IIR
IIR-1 42 12 97-01-17 Launch failure
IIR-2 43 13 1997-035A 24876 F-5 97-07-23 Rb 98-01-31 00:57 UT
IIR-3 46 11 1999-055A 25933 D-2 99-10-07 Rb 00-01-03 15:02 UT
IIR-4 51 20 2000-025A 26360 E-1 00-05-11 Rb
Notes
-----
1. NORAD Catalog Number is also known as U.S. Space Command (USSPACECOM)
object number and NASA catalog number.
2. No orbital plane position = satellite no longer operational.
3. Clock: Rb = Rubidium; Cs = Cesium.
4. Selective Availability (S/A) had been enabled on Block II satellites during
part of 1990; S/A off between about 10 August 1990 and 1 July 1991 due to
Gulf crisis; standard level re-implemented on 15 November 1991;
occasionally off for test and other purposes. S/A was set to 0 on all
satellites by presidential order on 2 May 2000 at approximately 04:00 UT.
5. Anti-spoofing (A-S) was activated on 31 January 1994 at 00:00 UT on all
Block II satellites (ref. NANU 050-94042); occasionally off for test and
other purposes.
6. Decommissioning dates:
The decommissioning date for PRN06/SVN03 is the date of termination of
operations of this satellite (ref. USNO) and is about 3 weeks later than
other published dates for "deactivation".
PRN14 was set unusable on 26 March 2000 at 23:48 UT and subsequently
decommissioned on 14 April 2000 at 13:47 UT (ref. NANUs 2000037 and
2000054).
SVN20/PRN20 had been unusable since 10 May 1996 according to NANU 118-96204
although it was set usable between 07:36 UT on 20 May 1996 and 22:42 UT on
21 May 1996 (ref. NANUs 094-96141 and 095-96142). Disposed of on 13
December 1996 (ref. USNO).
PRN28 was last usable on 4 November 1996 at 16:34 UT (ref. NANU 179-96309).
It was declared inoperable in May 1997. It was removed from the broadcast
almanacs of all satellites on 15 August 1997. See Navstar GPS
Constellation Status report of 6 November 1997 for more information.
7. PRN number of SVN32 was changed from 32 to 01 on 28 January 1993.
8. PRN05 and PRN06 are equipped with corner-cube reflectors for satellite
laser ranging (SLR). SLR tracking of the satellites will permit onboard
clock errors and satellite ephemeris errors in GPS tracking to be
differentiated.
9. PRN11 (SVN46) was launched on 7 October 1999. It was set usable on 3
January 2000 at 15:02 UT (ref. NANU 2000001).
10. PRN14's active clock was switched from a cesium to a rubidium in a
procedure beginning on 26 January 2000 at 01:00 UT. The procedure was
completed on 3 February 2000 at 18:16 UT (ref. NANU 2000023). PRN14 was
subsequently decommissioned (see above).
11. PRN16 has experienced clock problems. Its active clock was switched from
Cesium #4 to Rubidium #1 and then to Rubidium #2 in a procedure beginning
on 24 March 2000 at 09:55 UT. The procedure was completed on 7 April 2000
at 21:12 UT (ref. NANU 2000047, GPS Support Center, and USCG).
12. SVN51/PRN20 was launched on 11 May 2000 at 01:48 UT. It will reside in
slot E-1, replacing PRN14.
13. The satellites in planes A and F have been re-phased. This version of the
constellation status table indicates the re-phased slot locations.
14. Compiled by Richard B. Langley, Dept. of Geodesy and Geomatics Engineering,
University of New Brunswick.
===============================================================================
Richard B. Langley E-mail: lang at unb.ca
Geodetic Research Laboratory Web: http://www.unb.ca/GGE/
Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142
University of New Brunswick Fax: +1 506 453-4943
Fredericton, N.B., Canada E3B 5A3
Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/
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