Not just for navigation. The geodetic community time-tags GPS measurements with GPS (System) Time and all RINEX observation files, for example, use GPS Time as the measurement epoch time scale. But, there are also other high-level time scales maintained by different GPS analysis centres as well as a merged IGS time scale. More info here for those interested in the intracacies: <www.ngs.noaa.gov/IGSWorkshop2008/docs/IGS2008-Senior.pdf>. -- Richard Langley
Quoting "Matsakis, Demetrios" <matsakis.demetr...@usno.navy.mil>: > 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 > =============================================================================== Richard B. Langley E-mail: l...@unb.ca Geodetic Research Laboratory Web: http://www.unb.ca/GGE/ Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142 University of New Brunswick Fax: +1 506 453-4943 Fredericton, N.B., Canada E3B 5A3 Fredericton? Where's that? See: http://www.city.fredericton.nb.ca/ =============================================================================== _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
