GPS - GPS World: 32 GPS Satellites: Today was the Day

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GPS World: 32 GPS Satellites: Today was the Day

Sam Wormley

2008-02-26, 10:33 pm

32 GPS Satellites: Today Is the Day
http://sidt.gpsworld.com/gpssidt/co...p.jsp?id=494615

Feb 26, 2008
GPS World

Today will be the historic day that GPS users see a healthy,
32-satellite constellation orbiting the earth, if all goes according
to plan.

The U.S. military's GPS administrators issued a Notice Advisory to
NAVSTAR Users (NANU) this morning advising that satellite SVN23,
transmitting L-band code as PRN32, would be set to healthy as of
18:00 Zulu today, "Zulu" being the military and civil aviation term
for Coordinated Universal Time. In civilian terms, that translates to
1 p.m. Eastern Standard Time in the United States.

The PRN32 designation is notable among other reasons because it is
the first time that the PRN32 designation will be used by an
operational, healthy GPS satellite \u2014 and the first time there
have been 32 satellites designated healthy within the GPS
constellation. The military had originally advised February 7 that
SVN23 would be set to healthy, but then announced a delay of that
designation February 20.

When it is set to healthy, some older GPS receivers might not be able
to see it; GPS receivers initially were built to accommodate up to 31
satellite signals, and a PRN designated with the number 32 can't be
tracked by some manufacturers' devices that look for PRNs numbered 0
through 31; typically these are older-model receivers.

The U.S. Air Force began testing the PRN32 designation late in 2006.
While SVN23/PRN32 was set to unhealthy and not included in the
operational GPS constellation almanac, some all-in-view GNSS tracking
stations received the L-band signal. As of January 2007, SVN23 has
been broadcasting steadily but set to unhealthy and not included in
the almanac. Nevertheless, a number of civilian users have reported
being able to track PRN32 since then.

Tom

2008-02-27, 7:33 am

27 Feb 2008 04:12:02 "Sam Wormley" wrote:

> Feb 26, 2008
> GPS World
>
> Today will be the historic day that GPS users see a
healthy,
> 32-satellite constellation orbiting the earth

Yes, the constelation is realy great. Anyway, there is
"only" 31
bird active (not 32):

"GPS SATELLITE SVN37 (PRN07) WAS DECOMMISSIONED FROM
ACTIVE
SERVICE ON JDAY 354 (20 DEC 07)"
(NANU 2007169, December 20, 2007 3:39 PM)

--
Tom

Sam Wormley

2008-02-27, 10:33 pm

Tom wrote:
> 27 Feb 2008 04:12:02 "Sam Wormley" wrote:
>
> healthy,
>
> Yes, the constelation is realy great. Anyway, there is
> "only" 31
> bird active (not 32):
>
> "GPS SATELLITE SVN37 (PRN07) WAS DECOMMISSIONED FROM
> ACTIVE
> SERVICE ON JDAY 354 (20 DEC 07)"
> (NANU 2007169, December 20, 2007 3:39 PM)
>
> --
> Tom
>

True Tom!
-Sam

http://gps.afspc.af.mil/gps/Current/current.oa1?
UNCLASSIFIED
GPS OPERATIONAL ADVISORY 058.OA1
SUBJ: GPS STATUS 27 FEB 2008

1. SATELLITES, PLANES, AND CLOCKS (CS=CESIUM RB=RUBIDIUM):
A. BLOCK I : NONE
B. BLOCK II: PRNS 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15
PLANE : SLOT F6, D1, C2, D4, B5, C1, A3, A1, E3, D2, B4, F3, F1, F2
CLOCK : CS, RB, CS, RB, RB, RB, CS, CS, RB, RB, RB, RB, RB, RB
BLOCK II: PRNS 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29
PLANE : SLOT B1, C4, E4, C3, E1, D3, E2, F4, D5, A5, F5, A4, B3, C6
CLOCK : RB, RB, RB, RB, RB, RB, RB, RB, CS, RB, RB, CS, RB, RB
BLOCK II: PRNS 30, 31, 32
PLANE : SLOT B2, A2, E5
CLOCK : 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)

2008019 082147Z FEB 2008 23 FCSTDV 046/0100-046/1600
2008021 150835Z FEB 2008 23 FCSTSUMM 046/0141-046/0802
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)

2008020 142129Z FEB 2008 GENERAL /-/
2008022 191647Z FEB 2008 GENERAL /-/
2008023 230032Z FEB 2008 GENERAL /-/
2008024 261809Z FEB 2008 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
HTTP://GPS.AFSPC.AF.MIL/GPS OR HTTP://GPS.AFSPC.AF.MIL/GPSOC

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