[time-nuts] Frequency Ensemble

[Mike Cook]

> Le 17 mars 2019 à 02:16, Anton Moehammad via time-nuts <time-nuts at lists.febo.com> a écrit :
> 
> Hi Everyone,I like to know if it possible to run let say 10 GPSDO, 16 Rb clock together and take the average to control 1 "master clock" and have better stability ?like what BIPM or NIST doing.

I think the answer to this is probably no but it would make a nice project. I say no because your GPSDO will already be benefiting the from the clocks in GPS constellation that are being steered, probably indirectly) by the UTC(NIST) clocks, steered by the AT1 time scale, created from a whole bunch of cesium , maser and optical clocks  , so your GPSDO is the equivalent of a master clock. This means that you only need one…well three to verify that one is not going on the blink. A GPSDO or Rubidium stability will probably be in the range of a few parts in 10^11 - 10^12. 
Measuring the phase offsets of a bunch go those and applying corrections to a another free running clock might buy you a zero but it is questionable I think. You are probably constrained by the quality of the chosen ‘master’. If there was a distinct advantage I would expect to see products on the market using this approach. I haven’t heard of any.

> I have search about ensemble system but I have no idea how much advantage I get from some clock that I already have.Thank YouAnton 
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