[time-nuts] Thunderbolt GPS rollover

Azelio Boriani azelio.boriani at screen.it
Thu Jun 7 22:34:31 UTC 2012


So we must find a way to upload a new firmware for the TBolt before the
2017... that is download the actual firmware (3.00) correct the bias and
upload the corrected one.

On Thu, Jun 7, 2012 at 10:48 PM, David McGaw <n1hac at alum.dartmouth.org>wrote:

> Not true.  GPS week is imbedded in the GPS data.
>
> David
>
>
> On 6/7/12 4:39 PM, Mark Sims wrote:
>
>> Most GPS receivers base their rollover point from their data of
>> manufacture/firmware creation/etc.   The week rolls over 1024 weeks after
>> that.   They tend to not be dependent upon when the actual GPS week rolls
>> over.  Better receivers have ways of inferring the actual week after a
>> rollover occurs...  it appears that the Thunderbolt does not do this.
>> Also,  most GPS receivers do not cease to work after a rollover...  they
>> just report a bad date.
>>
>>  From the Thunderbolt manual:
>> The first week number roll-over will occur as August 21, 1999 (GPS)
>> transitions to August 22, 1999 (GPS). The ThunderBolt adjusts for this week
>> rollover by adding 1024 to any week number reported by GPS which is less
>> that week number 936 which began on December 14, 1997. With this technique,
>> the ThunderBolt will provide an accurate translation of GPS week number and
>> TOW to time and date until July 30, 2017.
>>
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