[time-nuts] Newbie question about GPS

[Björn]

Hi Mattias,

Then if you lock and control the 48MHz.  You can also control the 1PPS edge to the accuracy of the computed time...  add 1s drift and lock uncertainty.

Read the beginning of the Tbolt manual. The Tbolt lets it’s locked 10MHz tick the whole receiver.

/Björn 

Sent from my iPhone

> On 2 Mar 2020, at 22:14, Matthias Welwarsky <time-nuts at welwarsky.de> wrote:
> 
> 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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> 
> 
> 
> 
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