[time-nuts] GPS jump

[Bob Camp]

Hi

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:

http://www.nist.gov/pml/div688/grp40/gpsarchive.cfm

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. 

Bob

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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