LANG@unb.ca (Richard@UNBMVS1.csd.unb.ca Langley) (01/03/91)
The 10th Navstar GPS Block II satellite, PRN 23, was launched on 26
November 1990 into the E-plane, and was made available on 10 December.
Satellite I-6,PRN 9, has been set unusable since 11 December 1990. The
updated Navstar GPS Constellation Status table given below reflects
these events.
Navstar GPS Constellation Status
(91-01-02)
Blk NASA Orbit
II PRN Internat. Catalog Plane Launch
Seq SVN Code ID Number Pos'n Date Clock Comment
--------------------------------------------------------------------------------
Block I
1 4 1978-020A 10684 78-02-22 Not usable since 85-07
2 7 1978-047A 10893 78-05-13 Not usable since 85-09
3 6 1978-093A 11054 A-3 78-10-06 Rb
4 8 1978-112A 11141 78-12-10 L-band signals turned
off 89-10-14
5 5 1980-011A 11690 80-02-09 Not usable since 84-05
6 9 1980-032A 11783 A-2 80-04-26 Rb Operating on 2nd Rb clock;
set unusable 90-12-11
7 81-12-18 Launch failure
8 11 1983-072A 14189 C-3 83-07-14 Cs
9 13 1984-059A 15039 C-1 84-06-13 Cs
10 12 1984-097A 15271 A-1 84-09-08 Cs
11 3 1985-093A 16129 C-4 85-10-09 Rb operating on Rb clock
without temp. control
Block II
II-1 14 14 1989-013A 19802 E-1 89-02-14 Cs Became available 89-04-15
II-2 13 2 1989-044A 20061 B-3 89-06-10 Cs Became available 89-08-10
II-3 16 16 1989-064A 20185 E-3 89-08-18 Rb Became available 89-10-14
II-4 19 19 1989-085A 20302 A-4 89-10-21 Cs Became available 89-11-23
II-5 17 17 1989-097A 20361 D-3 89-12-11 Cs L-band signals enabled
90-01-06
II-6 18 18 1990-008A 20452 F-3 90-01-24 Cs Became available 90-02-14
22:26 UT
II-7 20 20 1990-025A 20533 B-2 90-03-26 Cs Became available 90-04-18
23:13 UT
II-8 21 21 1990-068A 20724 E-2 90-08-02 Cs Became available 90-08-22
15:00 UT
II-9 15 15 1990-088A 20830 D-2 90-10-01 Cs Became available 90-10-15
00:39 UT
II-10 23 23 1990-103A 20959 E-4 90-11-26 Cs Became available 90-12-10
23:45 UT
Notes
1. NASA Catalog Number is also known as NORAD or U.S. Space Command object
number.
2. No orbital plane position = satellite no longer operational.
3. Clock: Rb = Rubidium; Cs = Cesium
4. PRN 16 is scheduled to switch to a Cs clock early in 1991.
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Richard B. Langley BITnet: LANG@UNB.CA or SE@UNB.CA
Geodetic Research Laboratory Phone: (506) 453-5142
Dept. of Surveying Engineering Telex: 014-46202
University of New Brunswick FAX: (506) 453-4943
Fredericton, N.B., Canada E3B 5A3
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