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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