[ntp:questions] Strange jumps in PPM

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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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