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sci.geo.satellite-nav (Global Satellite Navigation) (sci.geo.satellite-nav) Discussion of global navigation satellite systems (GNSS). Topics include the technical aspects of GNSS operation, user experiences in the use of GNSS, information regarding GNSS products and discussion of GNSS policy (such as GPS selective availability).

Air Force Official Press Release - GPS Ground System Anomaly

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Old January 28th 16, 07:33 PM posted to sci.geo.satellite-nav
Sam Wormley[_2_]
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Posts: 775
Default Air Force Official Press Release - GPS Ground System Anomaly

Air Force Official Press Release - GPS Ground System Anomaly

On 26 January at 12:49 a.m. MST, the 2nd Space Operations Squadron at the
50th Space Wing, Schriever Air Force Base, Colo., verified users were
experiencing GPS timing issues. Further investigation revealed an issue in
the Global Positioning System ground software which only affected the time
on legacy L-band signals. This change occurred when the oldest vehicle, SVN
23, was removed from the constellation. While the core navigation systems
were working normally, the coordinated universal time timing signal was off
by 13 microseconds which exceeded the design specifications. The issue was
resolved at 6:10 a.m. MST, however global users may have experienced GPS
timing issues for several hours. U.S. Strategic Command's Commercial
Integration Cell, operating out of the Joint Space Operations Center,
effectively served as the portal to determine the scope of commercial user
impacts. Additionally, the Joint Space Operations Center at Vandenberg AFB
has not received any reports of issues with GPS-aided munitions, and has
determined that the timing error is not attributable to any type of outside
interference such as jamming or spoofing. Operator procedures were modified
to preclude a repeat of this issue until the ground system software is
corrected, and the 50th Space Wing will conduct an Operational Review Board
to review procedures and impacts on users. Commercial and Civil users who
experienced impacts can contact the U.S. Coast Guard Navigation Center at
(703) 313-5900.

Very Respectfully,
USCG Navigation Center
Navigation Information Service
7323 Telegraph Road
Alexandria, VA 20598-7310


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