The best way to get "Time" out of GPS is to apply the leap seconds and subframe 4 corrections of the broadcast GPS navigation message to GPS time, and get UTC(USNO) via GPS. Most GPS receivers do this automatically. There can be calibration and latency issues, which are usually but not always below 10 ns.
GPS time itself is provided for navigation solutions. That is why it does not incorporate leap seconds, and that is also why GPS time is steered by acceleration (not rate) to UTC(USNO), modulo 1 second, using the so-called bang-bang algorithm. The best reference would be the ICD-GPS-202, which is written in style I would describe as "for engineers". -----Original Message----- From: leapsecs-boun...@leapsecond.com [mailto:leapsecs-boun...@leapsecond.com] On Behalf Of Greg Hennessy Sent: Thursday, December 18, 2008 6:53 AM To: Leap Second Discussion List Subject: Re: [LEAPSECS] WP7A status > http://www.newscientist.com/article/mg20026875.400-calls-to-scrap-the- > leap-second-grow.html The report has a sentence "GPS time is not a reference, it is simply an internal time for GPS system synchronization, as GLONASS time is and Galileo time will be." Is what it takes to be a reference documented any where? _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
