-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
On Behalf Of Schlechte, Gene
Sent: 14 February 2008 21:51
To: [log in to unmask]
Subject: RE: CGSIC: PRN32 expected to be set Healthy on 19FEB2008
To CGSIC Registered Members email distribution:
John Owen kindly corrected my last email concerning the use of PRN32 in
his email that follows this one. GPS has used PRN32 once before on an
operational satellite. I asked the GPS Operations Center and have been
told that PRN32 was used between 1992 and 1993 and then it was changed
to a different PRN after it was discovered that some receivers at that
time interpreted the PRN as 00.
This history is in part why the United States Air Force GPS Wing issued
an open memorandum over a year ago (September of 2006) to the GPS
community. CGSIC distributed the memorandum to all of our membership at
the time and the following link is to a copy of the memorandum.
http://www.navcen.uscg.gov/gps/geninfo/50SW_GPSW_letter.pdf
The issue was also discussed at the last CGSIC meeting at Fort Worth
Texas during September of 2007.
My thanks to John Owen for correcting my omission of the use of PRN32 in
the 1990s. It gives me the opportunity to stress to the CGSIC
membership the importance of advising your associates in the GPS
community to report any GPS receiver issues with PRN32 when it is placed
operational next week. Roughly 15 years has passed since PRN32 was last
broadcast and during that time much effort has been made in providing
notification to the GPS manufacturers and users that PRN32 may be used
in the future. However, there are probably many users who do not
subscribe to NAVSTAR Advisory Notice to Users (NANUs) or participate in
CGSIC.
As stated in the NANUs, civil GPS users should report GPS outages or
problems to the Navigation Center (NAVCEN). The preferred way to make a
report is by internet using the "GPS report-a-problem" link located on
the following NAVCEN website page:
http://www.navcen.uscg.gov/gps/default.htm
A report can also be made by calling the Navigation Information Service
24 hour phone number (703-313-5900).
Best Regards,
CGSIC Executive Secretariat (acting)
Gene Schlechte, Systems Management Division, USCG Navigation Center
-----Original Message-----
From:
Sent: Wednesday, February 13, 2008 7:17 AM
To: Schlechte, Gene
Cc: Rob Linham; Glenn Kingsley
Subject: Re: CGSIC: PRN32 expected to be set Healthy on 19FEB2008
Dear Gene
Not quite true. Way back in the mid 1990's an operational satellite was
set to PRN 32. Unfortunately a problem with Rockwell's software resulted
in some unusual receiver behavior!!! The PRN number was changed within
days of the SV being set operational.
But are not some of these receivers still in use?
Regards
John Owen
Date sent: Tue, 5 Feb 2008 18:39:01 -0500
From: "Schlechte, Gene" <[log in to unmask]>
To: <[log in to unmask]>
Subject: CGSIC: PRN32 expected to be set Healthy on 19FEB2008
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To CGSIC Registered Members email distribution:
Below is the GPS User Advisory issued today announcing that SVN23
(PRN32) can be expected to be set usable on 19 FEB 2008. This will be
the
first time that PRN32 will be used by an operational GPS satellite.
Best Regards,
CGSIC Executive Secretariat (acting)
Gene Schlechte, Systems Management Division, USCG Navigation Center
-----Original Message-----
Sent: Tuesday, February 05, 2008 9:18 AM
To: NANU list server
Subject: NANU 2008016
NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2008016 NANU TYPE: GENERAL
*** GENERAL MESSAGE TO ALL GPS USERS ***
THE GPS COMMUNITY GAINED APPROVAL TO SET SVN23 (PRN32) USABLE. BASED ON
CURRENT PLANNING, SVN23 (PRN32) WILL BE SET USABLE ON JDAY 050 (19 FEB
2008).
AN ADDITIONAL NANU WILL TRANSMIT NLT 4 DAYS PRIOR TO THE PROJECTED
USABLE DATE/TIME.
IF NECESSARY, ADDITIONAL NANUS WILL NOTIFY USERS OF ANY CHANGES TO THIS
PLAN. ANYONE EXPERIENCING PROBLEMS OR HAVING ANY CURRENT CONCERNS WITH
PRN32 SHOULD CONTACT THE APPROPRIATE AGENCY LISTED BELOW.
POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER AT HTTP://GPS.AFSPC.AF.MIL/GPSOC, DSN
560-2541, COMM 719-567-2541, [log in to unmask],
HTTP://GPS.AFSPC.AF.MIL/GPS MILITARY ALTERNATE - JOINT SPACE OPERATIONS
CENTER, DSN 276-9994, COMM 805-606-9994,
[log in to unmask]
*** GENERAL MESSAGE TO ALL GPS USERS ***
POC:
CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER at HTTP://GPS.AFSPC.AF.MIL/GPSOC, DSN
560-2541, COMM 719-567-2541, [log in to unmask],
HTTP://gps.afspc.af.mil/gps MILITARY ALTERNATE - JOINT SPACE OPERATIONS
CENTER, DSN 276-9994, COMM 805-606-9994,
[log in to unmask]
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