3 ms·
Interesting. Would the 13-microsecond discrepancy mean that GPS positions were over two miles off during those 12 hours?
by skykooler 11y ago
Interesting. Would the 13-microsecond discrepancy mean that GPS positions were over two miles off during those 12 hours?
- bjcubsfan 11y agoNo, the discrepancy was only on a timing message for determining UTC. This is not used for determining position.
- cnvogel 11y agoSpecifically, one or few of the sattelites sent a wrong value "A0" in its "Page 18 of subframe 4" message. Page 37, §2.4.5.5 in http://www.gps.gov/technical/ps/1995-SPS-signal-specification.pdf http://www.gps.gov/technical/ps/1995-SPS-signal-specificatio... https://www.febo.com/pipermail/time-nuts/2016-January/095692.html https://www.febo.com/pipermail/time-nuts/2016-January/095692...
- ars 11y agoProbably not if they were all off by the same amount. Position is based on relative difference between time signals received from different satellites, not absolute.
- bjcubsfan 11y agoThis error only occurred on a certain revision of GPS satellites, not all of them. It would have been a problem, except luckily the error was only on a message for determining UTC. The error did not affect the message or clock that are used in determining position.