[IGSMAIL-0571] Re
Richard
Richard
Mon Apr 18 10:48:09 PDT 1994
IGS Electronic Mail Mon Apr 18 10:48:09 PDT 1994 Message Number 0571
******************************************************************************
Author: Richard B. Langley
Subject: Re: Block-1 est morte!
On Sat, 16 Apr 94 06:03:41 ADT clark at tomcat.gsfc.nasa.gov (Tom Clark
-- W3IWI) writes:
> This is a sad happening for those of us who liked having a few non-SA
> satellites for clock synchronization. I saw no announcement of the
> Block-1 decommissioning -- did anyone?
As my latest status report indicated (see below), PRN03 and PRN13 were
both set unhealthy on 27 February and have remained that way since.
PRN13 was not expected to return to service. I will update the status
table to reflect the current situation in the next couple of days.
Navstar GPS Constellation Status
(94-03-25)
Blk NASA 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 C-1 84-06-13 Rb 84-07-19
10 12 1984-097A 15271 A-1 84-09-08 Rb 84-10-03
11 03 1985-093A 16129 C-4 85-10-09 Rb 85-10-30
Block II
II-1 14 14 1989-013A 19802 E-1 89-02-14 Cs 89-04-15 05:02 UT
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-3 89-08-18 Cs 89-10-14 20:21 UT
II-4 19 19 1989-085A 20302 A-4 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 B-2 90-03-26 Cs 90-04-18 23:13 UT
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-2 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 C-2 92-04-10 Cs 92-04-25 20:32 UT
II-14 26 26 1992-039A 22014 F-2 92-07-07 Cs 92-07-23 19:43 UT
II-15 27 27 1992-058A 22108 A-3 92-09-09 Cs 92-09-30 20:08 UT
II-16 32 01 1992-079A 22231 F-1 92-11-22 Cs 92-12-11 14:49 UT
II-17 29 29 1992-089A 22275 F-4 92-12-18 Cs 93-01-05 16:39 UT
II-18 22 22 1993-007A 22446 B-1 93-02-03 Cs 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 Cs 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 Cs 93-11-22 18:20 UT
II-24 36 06 1994-016A 23027 C-1 94-03-10 Projected usable 94-04-18
38 To be launched on need in FY '94
33 To be launched on need in FY '94
40 To be launched on need in FY '95
30 To be launched on need in FY '95
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. 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. Currently, PRN15 and PRN20 appear
to have little or no S/A imposed.
5. Anti-spoofing was activated on 94-01-31 at 0000 UT on all Block II
satellites. (ref. NANU 050-94042)
6. PRN number of SVN32 was changed from 32 to 01 on 93-01-28.
7. PRN03 is operating on Rb clock without temperature control.
8. PRN03 was set unhealthy on 94-02-27 at 0320 UT. It was unusable beginning
at 0233 UT on 94-02-27 and will remain unusable until further notice. (ref.
NANU 083-94059)
9. 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 the
date GPSIC gives for "deactivation".
10. The PRN06/SVN36 launch included the SEDS-2 tether experiment on the Delta II
rocket body (object 23028, 1994-016B).
11. PRN09 was unusable beginning 93-10-15 1200 UT until 93-12-07 1940 UT due to
testing. (ref. NANU 327-93288 and NANU 402-93341)
12. PRN13 was set unhealthy on 94-02-27 at 1302 UT and will remain unusable
until further notice due to "end of life testing." (ref. NANU 083-94059 and
USNO). It is unlikely that PRN13 will return to service. (ref. USNO)
13. The degraded C/A-code performance of PRN19 was corrected effective 94-01-04
at 0000 UT. (ref. NANU 343-93294, NANU 396-93337, and NANU 006-94010)
14. PRN24 was unusable from 94-01-23 1745 UT until 94-02-01 1516 UT due to a
change in operational frequency standard from Cs to Rb. (ref. NANU
023-94023, NANU 029-94024, NANU 034-94032, and USNO)
===============================================================================
Richard B. Langley Internet: LANG at UNB.CA or SE at UNB.CA
Geodetic Research Laboratory BITnet: LANG at UNB or SE at UNB
Dept. of Geodesy and Geomatics Engineering Phone: (506) 453-5142
University of New Brunswick FAX: (506) 453-4943
Fredericton, N.B., Canada E3B 5A3 Telex: 014-46202
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