[ntp:questions] Strange jumps in PPM
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Null at BlackList.Anitech-Systems.invalid
Wed Aug 21 19:15:52 UTC 2013
A C wrote:
> Ok, so I saw the below event in the loops on my system which
> is controled by ATOM, SHM, and several internet servers.
> I suspect it has to do with the GPS PPS output glitching
> during extreme satellite events (bad constellation arrangement,
> fringe signal, etc.)
> Is there a way to have ntpd ignore the PPS quickly if it
> spins out of control? The system recovers fairly quickly
> and the clock doesn't go too far out but it would be nice
> to avoid these jumps.
Some GPS receivers have a PPS holdover option,
for when the fix quality goes invalid,
where it uses the local oscillator to try to keep the
PPS in phase, while the satellite reacquisition occurs.
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