[time-nuts] GPS jumps of -13.7 us?

Martin Burnicki martin.burnicki at burnicki.net
Thu Jan 28 03:05:42 EST 2016

Paul Boven schrieb:
> Hi everyone,
> Has anyone else seen GPS time jump by -13.7 usec today?
> I just heard from several geographically quite distributed radio
> observatories that they have seen their GPS receiver(s) jump compared to
> their in-house standards.

We have now received an official statement from USCG:

-----Original Message-----
> From: Hamilton, Stephen R CIV
> Sent: Wednesday, January 27, 2016 8:13 PM
> To: 'cgsic at cgls.uscg.mil'
> Subject: FW: Official Press Release - GPS Ground System Anomaly
> All CGSIC:
> 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.
> V/R
> Rick Hamilton
> CGSIC Executive Secretariat
> GPS Information Analysis Team Lead
> U.S. Coast Guard Navigation Center
> 703-313-5930


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