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The time scale is in Moscow Time, which is UTC + 4 hours. Roscosmos uses a global network of monitoring sites (including one at UNB) to check the status of the satellites. It is not clear if the monitoring problem was due to Internet communications problems or the satellites themselves. My guess is Internet communications problems and I guess we can't rule out possible NTP problems.
-- Richard On 1-Jul-12, at 11:24 PM, Richard B. Langley wrote:
A u-blox 6 GPS Engine did not play nice with the leap second. This new engine is GPS/SBAS/QZSS/GLONASS compatible but it only runs in either GPS/SBAS/QZSS mode or GLONASS mode. I was running it under GLONASS mode for the leap second check and recording its NMEA messages. Just before the leap second, it was tracking 9 satellites. At the leap second it reset itself. I don't know if this was caused by an error associated with the leap second or the receiver was programmed to do this. At second 0 of 1 July, it ceased positioning and did not know the time (at least no information was in the $GLZDA NMEA message). At 00:00:40.48 seconds, it once again knew UTC, and by 00:02:39.00, it was tracking enough GLONASS satellites (4) to report position information again. Extracted $GLGGA and $GLZDA messages from before and after the leap second are in the appended file.I'll be contacting u-blox to report the behaviour.Note that when I was monitoring a previous leap second with a GPS- only u-blox receiver, it sailed through the leap second with no problem:$GPZDA,235955.00,31,12,2005,00,00*6D $GPZDA,235956.00,31,12,2005,00,00*6E $GPZDA,235957.00,31,12,2005,00,00*6F $GPZDA,235958.00,31,12,2005,00,00*60 $GPZDA,235959.00,31,12,2005,00,00*61 $GPZDA,235960.00,31,12,2005,00,00*6B $GPZDA,000000.00,01,01,2006,00,00*62 $GPZDA,000001.00,01,01,2006,00,00*63 $GPZDA,000002.00,01,01,2006,00,00*60 $GPZDA,000003.00,01,01,2006,00,00*61 $GPZDA,000004.00,01,01,2006,00,00*66 $GPZDA,000005.00,01,01,2006,00,00*67We may have had trouble tracking GLONASS satellites with some of the continuously operating GNSS receivers operating at UNB and the Russian Space Agency may have had trouble monitoring the GLONASS satellites. I'll report on these anomalies later.-- Richard -----------------------------------------------------------------------------| 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.fredericton.ca/ |----------------------------------------------------------------------------- -----------------------------------------------------------------------------| 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.fredericton.ca/ |----------------------------------------------------------------------------- <output.txt>_______________________________________________ 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.fredericton.ca/ |
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