[time-nuts] GPS Sat Clock Data

Bob Camp lists at rtty.us
Thu Jun 3 23:08:09 UTC 2010


In this paper:

TOTAL HADAMARD VARIANCE: APPLICATION TO CLOCK STEERING BY KALMAN FILTERING by Dave Howe , Ron Beard , Chuck Greenhall , Franc ̧ois Vernotte	and Bill Riley


Figure 2 actually refers to:

Navstar Quarterly Report 00-3, Space Application Branch, NRL, Wash D.C. 20 July 2000.

The report apparently describes the level of variance on the various GPS satellites versus tau for the first half of 2000. Bottom line appears to be that 5x10^-13 is about as good as it gets out to 20 day tau unless you can pick your sats. 

Obviously this data is a bit dated. 

Is this data updated on a regular basis? Is it published somewhere?  Can one get a look at it without risking a long term stay in Federal prison? It certainly would be useful to those trying to tweak GPSDO's.


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