[time-nuts] GPS jump

Bob Camp kb8tq at n1k.org
Thu Oct 9 21:09:49 EDT 2014


GPS is steered by the Air Force last time I checked. 

A really good place to check is the NIST Time and Frequency pages that show both real time and historical data for each GPS sat compared to NIST time:


Hopefully it’s accessible via that link from a variety of locations. 

Since the NIST data is independent of the steering (two different outfits involved) it should not be vulnerable to a “our ground segment broke and we steered everything to match” sort of error. 


On Oct 9, 2014, at 7:43 PM, Jim Palfreyman <jim77742 at gmail.com> wrote:

> Folks,
> We look after 5 separate hydrogen masers spread all over Australia and we
> collect tic phases between the masers and the GPS.
> On around ~Oct 7 we have noticed that the normal steady straight line (with
> standard daily noise) took a noticeable downward turn - on all 5 masers.
> Did anyone else who tracks H-masers notice this as well?
> Is it JPL making corrections?
> Jim Palfreyman
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