[time-nuts] GPS Outage

jimlux jimlux at earthlink.net
Fri Feb 26 08:39:27 EST 2016


On 2/26/16 3:34 AM, Björn wrote:
> "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.

Actually not that weird.
They might all have inherited a published code snippet.  There's a 
little table driven chunk of code to compute CRCs that pretty much 
everybody uses, and it derives from some article published in the 70s or 
early 80s for an 8 bit micro.




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