[time-nuts] The GPS velocity of light versus neutrinos

Magnus Danielson magnus at rubidium.dyndns.org
Mon Nov 21 15:08:51 EST 2011


On 11/21/2011 08:57 PM, Brooke Clarke wrote:
> Hi Bill:
>
> Are they using GPS directly, or to discipline a high quality oscillator,
> say a Cs? Since it's frequency is spot on then all the GPS is doing is
> setting the edge of the 1 PPS. The difference between the Cs 1 PPS and
> GPS 1 PPS can be measured over a day or more to see what it looks like.
> I would expect that to be excellent.

They have a Cesium at each location and then use a pair of 
double-frequency GPS receivers to compare them. PTB has then used their 
dual frequency transportable clock to verify the time between the sites.

It is being described in the article, so do read it.

Cheers,
Magnus




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