[time-nuts] carrier phase tracking GPS receiver

[Dr Bruce Griffiths]

Didier Juges wrote:
> Dr Bruce Griffiths wrote:
>   
>> Didier
>>
>> Typically with a good local oscillator you can do even better than that, 
>> around 1E-11 in 1 sec is achievable and has been achieved.
>> Even with the on board TCXO typically 3E-11 or so in 1s is achieved.
>>
>> Bruce
>>
>>   
>>     
> I don't understand how such good variance can be achieved without some 
> method of electronic frequency control on the TCXO (unless the TCXO does 
> have EFC)?
>
> Otherwise, we would be back to the case where the receiver would 
> approximate the position of the PPS by skipping pulses, and we would 
> have the typical 40nS jitter (assuming a 25 MHz clock)
>
> I am more puzzled now :-)
>
> Didier
>
>
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Bon soir Didier

You are confusing the disciplining precision of the oscillator with 
measurement of its short term stability via the GPS receiver in this case.

Bruce