[time-nuts] GPS Sat Clock Data
Bob Camp
lists at rtty.us
Thu Jun 3 23:16:26 UTC 2010
Hi
Slipped a digit, 5x10^-13 should be 5x10^-14
Bob
On Jun 3, 2010, at 7:08 PM, Bob Camp wrote:
> Hi
>
> 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
>
> http://tf.nist.gov/general/pdf/1459.pdf
>
> 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.
>
> Bob
>
>
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