[time-nuts] Raspberry Pi NTP server

[Matthias Welwarsky]

On Sonntag, 12. Juli 2020 16:15:20 CEST Hal Murray wrote:
> Don't forget hanging bridges.  I don't know of any NTP software that knows
> about them.

If you're referring to the "sawtooth" on the 1PPS from the GPS, the NTP 
software shouldn't need to know. It's for whoever provides the PPS timestamps 
to make sure they're precise. So, if the NTP software gets its timestamps 
through e.g. gpsd, this entity should apply the correction.

However, those quantization errors are in a range of 10s of nanoseconds, maybe 
100ns or so, it depends on the internal clock of the GPS receiver to which the 
pulses are aligned. If your uncertainty is already in the microseconds range, 
correcting for a 10ns error will not be visible.