Hi,
On 09/08/2016 11:53 PM, Hal Murray wrote:
petervince1...@gmail.com said:
Can I just ask why the Z3801As are having week roll-over problems now - I
didn't think it was 2048 weeks since GPS "zero-hour" until late on the 6th
of April 2019?
It's probably 1024 weeks since a date was built into the firmware.
It's like the year 2000 problem. If you aren't worried about old people and
I tell you somebody was born in 03, you can assume that's 2003 rather than
1903. For GPS, a handy value for the cutoff is the date the firmware was
built. Any date that looks like it is older than the firmware is probably
off by a rollover.
We had this discussion in NTP context, and people where saying "We won't
fix receiver problems" and where not helpful. When I explained how GPS
time actually worked and just showing how the receivers was attempting
to correct the GPS signal behaviors they realized that 1024 week
wrap-around is more of a GPS generic problem and accepting time modulus
1024 weeks was not too hard. I don't know if that ever made it into the
code thought.
Cheers,
Magnus
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