[time-nuts] Checking accuracy of Rubidium standards

Bruce Griffiths bruce.griffiths at xtra.co.nz
Mon Nov 10 04:11:09 UTC 2008


Neville Michie wrote:
> Bruce, how does the three cornered hat scheme work?
>
> If I had two LPRO Rubidium oscillators and a TBOLT GPSDO, and I  
> divided each of them down to
> 100KHz, then I could compare pairs of them with D latches and record  
> 3 different analogue
> signals of phase difference.
> One of the LPRO oscillators is in an oven to remove ambient  
> temperature influence.
> If I ran them for several weeks and logged the signals every 10 minutes,
> what could I expect to recover from the data and how would I apply  
> the 3 cornered hat scheme?
> I ask this question because this is about where my building program  
> is taking me.
> cheers, Neville Michie
>
>   
Neville

If the phase differences are recorded every 10 minutes then the smallest
value of tau for which you can determine AVAR is 10 minutes.

Bruce




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