[time-nuts] GPS Outage

Björn bg at lysator.liu.se
Fri Feb 26 06:34:22 EST 2016


"The product will not report the correct extended GPS week number after the Feb,13th 2016.
After the rollover to week #860, the thunderbolt will not make position for 2 hours, because the Ephemeris data on the GPS receiver being consider incorrect.
The module will work fine after this 2 hours."

Have the Motorola Oncore/Navman/Jupiter receivers also been checked for this condition? 

Strange that at least 3 independant firmware trees/development teams should chose the same magic wk860.

I guess that someone with both affected non-trimble receivers and a gps rf simulator would need to spend some time on this.

--
      Björn

<div>-------- Originalmeddelande --------</div><div>Från: Martin Burnicki <martin.burnicki at burnicki.net> </div><div>Datum:2016-02-26  09:32  (GMT+01:00) </div><div>Till: time-nuts at febo.com </div><div>Rubrik: Re: [time-nuts] GPS Outage </div><div>
</div>Mark Sims wrote:
>> When is some organization going to explain what happened in February for almost two hours starting at 00:16 GMT?  That subject has gone silent.  Rob, NC0B
> I heard back from NAVCEN.  They said it was a Trimble issue and that Trimble would contact me (they didn't).   But that does not jive with reports of failures in Motorola, Navman, etc receivers.

I think we need to distinguish here.

The January 26 issue was due to faulty data sent by the satellites,
which caused GPS receivers to apply a wrong UTC correction which caused
the UTC time to be off by 13.7 us.

As explained by Luc Gaudin from http://naelcom.com (who obviously sell
Trimble GPS receivers) the February 13 issue was indeed just a Trimble
firmware problem. See:
https://www.febo.com/pipermail/time-nuts/2016-February/096042.html
https://www.febo.com/pipermail/time-nuts/2016-February/096050.html

Martin

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