[time-nuts] Newbie question about GPS

[Matthias Welwarsky]

On Montag, 2. März 2020 13:14:55 CET Anton Moehammad via time-nuts wrote:
>2. In the UCenter or almost any software
> control for GPS module/receiver we can find data for next pps, why if the
> software can calculate the PPS should be they do not use it to adjust the
> PPS output so the PPS jitter is minimal ?

There are no clocks in a GPS receiver with picoseconds resolution and 
everything the GPS outputs will be naturally restricted to its internal clock 
granularity. The time pulse signal from a Ublox module can therefore only be 
accurate to tens of nanoseconds (around 20ns assuming an internal 48MHz 
clock). However, the time solution calculated by the receiver will be much 
better. The quantization error reported in the TP5 message can simply be added 
to the timestamp of the received pulse to calculate its true arrival.

BR,
Matthias

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