Le 10 oct. 2014 à 03:09, Bob Camp a écrit : > 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 <[email protected]> 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.
I remember Jim reported a similar issue back in october last year: >> On 2013-10-03 05:33, Jim Palfreyman wrote: >> >>> Noticed an above average bump in our H-Maser vs GPS graphs - from sites >>> all >>> over Australia. >>> >>> Recent coronal mass ejection or US government shutdown not updating GPS? >>> >>> Anyone else seen it? >>> >> >> drop out gap between about 04.21-04.26 UTC? >> clockstats.20131003: >> 56568 15684.876 127.127.20.4 $GPRMC 042124 A ... >> 56568 16004.862 127.127.20.4 $GPRMC 042644 A ... >> peerstats.20131003: >> 56568 15684.876 127.127.20.4 961a -0.000002270 ... 0.000005344 >> 56568 16004.862 127.127.20.4 961a -0.000013150 ... 0.000015721 >> loopstats.20131003: >> 56568 15684.876 -0.000002270 0.899 0.000007071 0.000070 4 >> 56568 16004.862 -0.000013150 0.898 0.000008830 0.000114 4 That dates are close enough to make you wonder if it is not part of some cycle. >> >> Did anyone else who tracks H-masers notice this as well? >> >> Is it JPL making corrections? >> >> >> Jim Palfreyman >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
