[time-nuts] I thought GPS repeated every 12 hours (-2 minutes)
Bob Camp
kb8tq at n1k.org
Mon May 23 19:37:00 EDT 2016
Hi
Well, *maybe* there is a 24 hour component in the GPS constellation :)
Indeed a lot of stuff repeats at the 24 hour point. The ionosphere is a bit different at midnight than at noon.
Bob
> On May 23, 2016, at 6:43 PM, Skip Withrow <skip.withrow at gmail.com> wrote:
>
> Hello Nuts,
>
> I am attaching a capture from Lady Heather of a 3-day run. You can see the
> temperature vary by 7C over each day. The TB is being run open loop and
> another GPSDO 10MHz input to the unit instead of the unit's oscillator.
>
> I expected the purple line to repeat every 12 hours based on the GPS
> constellation being the same (which maybe it kind of does), but there is
> definitely a 24 hour repeat. What is really weird is that the number of
> satellites that LH sees also repeats on a 24 hour cycle, not 12 (bottom
> trace).
>
> Any help in understanding this behavior? Thanks in advance.
>
> Skip Withrow
>
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