On Fri, 6 Apr 2007 16:50:47 GMT, John Ackermann N8UR wrote: > David J Taylor wrote: >> John Ackermann N8UR wrote: >>> David J Taylor said the following on 04/06/2007 02:26 AM: >>>> John Ackermann N8UR wrote: >>>>>> Further to the news today that the solar flare on Dec. 5/6, 2006 >>>>>> caused GPS disruption, it just so happens I was logging the signal >>>>>> strength (average of all satellites tracked) of an M12+T timing >>>>>> receiver at that time. For what it's worth, the attached plot >>>>>> shows what I saw. This was the only significant signal strength >>>>>> anomaly in over one year of data capture. >>>>>> >>>>>> John >>>> Could you please provide a URL for the plot, John? >>>> Attachments are not allowed in the text newsgroup. >>> It's at http://www.febo.com/pages/gps_solar_flare . As of now there's >>> just an directory listing with the plot file, but I'll add a real >>> index page with some content when I get a chance. >>> >>> John >> >> Many thanks, John. That's quite surprising (although I don't plot any GPS >> strength as a matter of routine so I'm not really in a position to >> comment). I presume this affect is simply within the earth's atmosphere, >> rather than being any drop in ERP from the satellites themselves? > > I suspect it's atmospheric or some ionization effect, and not an actual > change in the birds. If I have the time/energy, I may do some more > analysis. The data I logged includes the signal strength of each SV > being tracked, but unfortunately doesn't include the SV numbers. So, I > can look to see if one or more birds were affected more than others, but > I can't link it back to individual orbits without the SV numbers. > I have clockstats files(+loopstats and peerstats) for the days. Its a Trimble Acutime 2000 with the ripencc driver(43).
Slightly mangled sample below: 54075 69833.663 127.127.43.0 U1 6.12.2006 19:23:53 13 01 54075 69833.784 127.127.43.0 C1 06122006 192353 6 -111411 110.2 677 6.7 14 56xx.x76732 N 10xx.x60707 E 118 14 17 20 28 1 0 11 19 54075 69833.834 127.127.43.0 S1 14 1 1 02 56.5 52.2 34.5 54075 69833.864 127.127.43.0 S1 17 2 1 02 56.2 311.0 28.5 54075 69833.904 127.127.43.0 S1 20 3 1 02 59.1 240.5 47.7 54075 69833.924 127.127.43.0 S1 28 4 1 02 49.9 266.0 10.3 54075 69833.964 127.127.43.0 S1 01 5 1 02 60.2 116.5 54.0 54075 69833.994 127.127.43.0 S1 11 7 1 02 55.8 186.8 74.6 54075 69834.023 127.127.43.0 S1 19 8 1 02 51.0 171.0 11.6 Raw data could be made available if someone would like to make analysis. /hjj _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
