GPS Satellite SVN24 Begins 12-Month Move
January 14, 2010
http://www.gpsworld.com/gnss-system/...e-9391?print=1

GPS satellite SVN24 began moving into a new orbital slot today as
scheduled. The U.S. Air Force Global Positioning Systems Wing and the
50th Space Wing on January 11 announced a reconfiguration of GPS
constellation to 24+3 or “Expandable 24.”

Moving three existing GPS satellites to new orbit locations is expected
to have a profound effect on GPS capabilities for all civil, commercial,
and military users worldwide. The plan will significantly alter the
current configuration, which consists of indeed 30 GPS satellites in MEO
or medium earth orbit that are used globally. However, many of the
additional satellites are currently flown in tandem, side by side, with
considerably older satellites and effectively limit the constellation
geometry to that of 24 satellites.

"We started implementation of the Expandable 24 today with a successful
Delta-V of SVN24. The reposition time is 12 months," said Col. David T.
Buckman, U.S. Air Force in a notification e-mail. For more on the
reconfiguration, read Don Jewell's Defense PNT editorial.

Ref: http://gps.afspc.af.mil/gps/Current/current.oa1
http://gps.afspc.af.mil/gps/Current/current.nnu
http://www.navcen.uscg.gov/gps/geninfo/NANUabbr.htm


NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2010004
SUBJ: SVN24 (PRN24) FORECAST OUTAGE SUMMARY JDAY 013/1652 - JDAY 014/0036
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2010004
NANU DTG: 140038Z JAN 2010
REFERENCE NANU: 2010003
REF NANU DTG: 082005Z JAN 2010
SVN: 24
PRN: 24
START JDAY: 013
START TIME ZULU: 1652
START CALENDAR DATE: 13 JAN 2010
STOP JDAY: 014
STOP TIME ZULU: 0036
STOP CALENDAR DATE: 14 JAN 2010

2. CONDITION: GPS SATELLITE SVN24 (PRN24) WAS UNUSABLE ON JDAY 013
(13 JAN 2010) BEGINNING 1652 ZULU UNTIL JDAY 014 (14 JAN 2010)
ENDING 0036 ZULU.

3. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTPS://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER at HTTP://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
COMM 719-567-2541, , HTTPS://gps.afspc.af.mil
MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514,
COMM 805-606-3514,


UNCLASSIFIED
GPS OPERATIONAL ADVISORY 013.OA1
SUBJ: GPS STATUS 13 JAN 2010

1. SATELLITES, PLANES, AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I : NONE
B. BLOCK II: PRNS 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
PLANE : SLOT B6, D1, C2, D4, E6, C6, A4, A3, A1, E3, D2, B4, F3, F1
CLOCK : RB, RB, CS, RB, RB, RB, RB, CS, CS, CS, RB, RB, RB, RB
BLOCK II: PRNS 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28
PLANE : SLOT F2, B1, C4, E4, C3, E1, D3, E2, F4, D5, A5, F5, A6, B3
CLOCK : RB, RB, RB, RB, RB, RB, RB, RB, RB, CS, RB, RB, CS, RB
BLOCK II: PRNS 29, 30, 31, 32
PLANE : SLOT C1, B2, A2, E5
CLOCK : RB, CS, RB, RB
2. CURRENT ADVISORIES AND FORECASTS :
A. FORECASTS: FOR SEVEN DAYS AFTER EVENT CONCLUDES.
NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU TIME START - STOP)

2010001 071958Z JAN 2010 29 FCSTDV 014/1830-015/0630
2010003 082005Z JAN 2010 24 FCSTDV 013/1630-014/1630
2010004 140038Z JAN 2010 24 FCSTSUMM 013/1652-014/0036
B. ADVISORIES:
NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU TIME START - STOP)

C. GENERAL:
NANU MSG DATE/TIME PRN TYPE SUMMARY (JDAY/ZULU TIME START - STOP)

2009025 061455Z APR 2009 GENERAL /-/
2010002 080157Z JAN 2010 GENERAL /-/
3. REMARKS:
A. THE POINT OF CONTACT FOR GPS MILITARY OPERATIONAL SUPPORT IS THE GPS
OPERATIONS CENTER AT (719)567-2541 OR DSN 560-2541.
B. CIVILIAN: FOR INFORMATION, CONTACT US COAST GUARD NAVCEN AT
COMMERCIAL (703)313-5900 24 HOURS DAILY AND INTERNET
HTTP://WWW.NAVCEN.USCG.GOV
C. MILITARY SUPPORT WEBPAGES CAN BE FOUND AT THE FOLLOWING
HTTPS://GPS.AFSPC.AF.MIL/GPS OR HTTP://GPS.AFSPC.AF.MIL/GPSOC