I've got this today from http://tycho.usno.navy.mil/gpscurr.html ==================================================== UNITED STATES NAVAL OBSERVATORY (USNO) GPS CONSTELLATION STATUS ************************************************************************ Information in this file is retained for approximately seven days or until completion of the event; be aware that the information provided below may change. ************************************************************************
A. BLOCK II/IIA/IIR/IIR-M INDIVIDUAL SATELLITE STATUS SVN PRN 15 15 Launched 01 OCT 1990; usable 15 OCT 1990; operating on Cs std Unusable 21 Aug 1358 UT and will remain unusable until further notice (NANU 2006079) 24 24 Launched 04 JUL 1991; usable 30 AUG 1991; operating on Cs std 25 25 Launched 23 FEB 1992; usable 24 MAR 1992; operating on Rb std 26 26 Launched 07 JUL 1992; usable 23 JUL 1992; operating on Rb std 27 27 Launched 09 SEP 1992; usable 30 SEP 1992; operating on Cs std 29 29 Launched 18 DEC 1992; usable 05 JAN 1993; operating on Rb std Unusable 26 Aug 0147 UT and will remain unusable until further notice (NANU 2006082) 30 30 Launched 12 SEP 1996; usable 01 OCT 1996; operating on Cs std 32 01 Launched 22 NOV 1992; usable 11 DEC 1992; operating on Cs std 33 03 Launched 28 MAR 1996; usable 09 APR 1996; operating on Rb std Unusable 24 Aug 1502 UT and will remain unusable until further notice (NANU 2006081) 34 04 Launched 26 OCT 1993; usable 22 NOV 1993; operating on Rb std 35 05 Launched 30 AUG 1993; usable 28 SEP 1993; operating on Rb std 36 06 Launched 10 MAR 1994; usable 28 MAR 1994; operating on Rb std 37 07 Launched 13 MAY 1993; usable 12 JUN 1993; operating on Rb std 38 08 Launched 06 NOV 1997; usable 18 DEC 1997; operating on Cs std 39 09 Launched 26 JUN 1993; usable 20 JUL 1993; operating on Rb std 40 10 Launched 16 JUL 1996; usable 15 AUG 1996; operating on Cs std 41 14 Launched 10 NOV 2000; usable 10 DEC 2000; operating on Rb std 43 13 Launched 23 JUL 1997; usable 31 JAN 1998; operating on Rb std 44 28 Launched 16 JUL 2000; usable 17 AUG 2000; operating on Rb std 45 21 Launched 31 MAR 2003; usable 12 APR 2003; operating on Rb std 46 11 Launched 07 OCT 1999; usable 03 JAN 2000; operating on Rb std 47 22 Launched 21 DEC 2003; usable 12 JAN 2004; operating on Rb std 51 20 Launched 11 MAY 2000; usable 01 JUN 2000; operating on Rb std 53 17 Launched 26 SEP 2005; usable 16 DEC 2005; operating on Rb std 54 18 Launched 30 JAN 2001; usable 15 FEB 2001; operating on Rb std Unusable 05 Sep 0053 to 0535 UT (NANUs 2006084, 2006085/05 SEP) 56 16 Launched 29 JAN 2003; usable 18 FEB 2003; operating on Rb std 59 19 Launched 20 MAR 2004; usable 05 APR 2004; operating on Rb std 60 23 Launched 23 JUN 2004; usable 09 JUL 2004; operating on Rb std 61 02 Launched 06 NOV 2004; usable 22 NOV 2004; operating on Rb std B. GPS ACTIVITIES 1. Coordinated Universal Time (UTC) Time Step (Leap Second) As of January 1, 2006, 0H 0M 0S, GPS is AHEAD of UTC by FOURTEEN (+14) seconds. 2. On 16 Dec 2005 at approximately 2330 UT, the L2-Band Civil Signal (L2C) was turned on for PRN17/SVN53, the first IIR-M satellite. The following conditions of use apply: a. The Air Force shall not guarantee the availability or quality of L2C signals until Initial Operational Capability (IOC). b. Users are cautioned that the new signal is under development and may be used for a variety of test applications until achievement of IOC. Prior to IOC, signal availability and quality of the L2C signal may be subject to change without prior notice. Therefore, any use of the L2C signal prior to being declared operational is at the user's own risk. Please contact the USCG Navigation Center (Comm 703-313-5900) or the GPS Operations Center (DSN 560-2541/Comm 719-567-2541) if you encounter problems. 3. Selective Availablility (SA) levels set to zero. On May 2, 2000 at 0400 UT, SA levels were set to zero. For more details, check the Interagency GPS Executive Board (IGEB) web site at http://www.igeb.gov. 4. GPS Automatic Time Steering In effect 18 Mar 1994 at 1415 UT and will remain in effect until further notice at rate +/-1.0E-19 seconds per second squared. 5. Activation of Anti-Spoof (A-S) A-S was activated January 31, 1994 at 0000 UTC. Due to the December 8, 1993 declaration of Initial Operational Capability (IOC), the P-code will not normally be available to users who do not have valid cryptographic keys (iaw Federal Radionavigation Plan (FRP) 1992). (NANU 050-94042/DTG 112045Z FEB 94) 6. Implementation of Selective Availability (SA) a. SA was reactivated on July 1, 1991 at 0400 UT and will remain in effect until further notice. Civil users will receive Standard Positioning Service (SPS) accuracy as specified in the Federal Radionavigation Plan (FRP). POC for policy: CDR Jackson at DSN 692-2634 or (719) 554-2634. (NANU 121-91182/DTG 011354Z JUL 91) b. According to the 2nd Satellite Operations Squadron (2SOPS) Operational Advisory Bulletin: SA was implemented on November 15, 1991 to the SPS level. For information concerning: BLOCK II see file . . . . . GPSB2 GPS SYSTEM see file . . . . . GPSSY TIME TRANSFER see file . . . . . GPSTT -- File GPSTD last updated Tue Sep 5 11:35:09 UTC 2006 ==================================================== SUMMARY PRN 03 (Unusable 24 Aug 1502 UT and will remain unusable until further notice) PRN 12 non orbiting PRN 15 (Unusable 21 Aug 1358 UT and will remain unusable until further notice) PRN 29 (Unusable 26 Aug 0147 UT and will remain unusable until further notice) PRN's 31 & 32 non orbiting 6 out of 32 birds being KO, it is nor critical (the constellation is supposed to have at least 24 live sats), but when you look ar PRN's 15, 03 & 29, (all three being shut down within a week) no, it is not normal... BTW, on all the 26 live stellites, only six (01, 08, 10, 24, 27 and 30) run on Cesium standards, all other rely on Rubidium. 73 de Normand Martel VE2UM Montreal, Qc. Canada. --- Christopher Hoover <[EMAIL PROTECTED]> wrote: > > [ the story seems overblown to me, but still worth > sharing. follow the > last link for some real data. - ch ] > > > GPS World: Current GPS constellation > Aug 30, 2006 > > <http://sidt.gpsworld.com/gpssidt/article/articleDetail.jsp?id=368448> > > > The current GPS constellation - its health and > viability - continues in > question and under scrutiny, despite reassurances > from the Air Force. > > Last month's GPS World Survey & Construction > e-newsletter relayed user > plaints that there aren't enough healthy GPS > satellites. Surveyors say > they can't use RTK a full day with the current > constellation even with > every satellite healthy - and that recently there > have been more > satellite outages than ever before. They've resorted > to filling GPS gaps > with GLONASS. > > The online story drew immediate affirmation. "While > most of the time we > get good coverage, for the last couple months we > have had a 4 to 6-hour > gap where we 'float' a lot and our precision goes > down. Unfortunately > this gap is usually between 10 am and 2 pm, which > creates some > interesting scheduling problems." > > For years only three companies offered combined > GPS/GLONASS receivers; > that number recently doubled and now includes all > major survey > manufacturers. The market speaks. It would be ironic > if GPS troubles > helped revive GLONASS, just as perceived GPS > shortcomings helped launch > Galileo. > > Others have written to ask what the JPO has been > doing that has kept > them occupied and unable to carry on GPS > modernization or effective > sustainment. In our September print issue of GPS > World, We invited the > GPS Joint Program Office to give their view > <http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=368240> > , > and we asked an independent consultant for his > perspective > <http://www.gpsworld.com/gpsworld/article/articleDetail.jsp?id=367591> > as well. > > > > _______________________________________________ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts