Author Topic: GLONASS temporary system-wide outage (Read 3239 times)

grythumn · « **on:** 04/03/2014 02:10 pm »

The GLONASS system suffered a system-wide outage for about 11 hours a few days ago. Reports indicate that incorrect ephemerides were uploaded to the satellites, which then had to be replaced one by one as the satellites came into range of ground stations.

http://www.insidegnss.com/node/3979
http://gpsworld.com/glonass-gone-then-back/

-R C

Langley · « **Reply #1 on:** 04/03/2014 02:58 pm »

Why have there been no reports in the popular press about this? Nothing in the Russian media as far as I can tell. This is an embarrassment to Russia. Is the government trying to keep it quiet? I suppose most car navigation units in Russia are still just GPS-based or perhaps GPS/GLONASS and the latter just ignored the GLONASS satellites during the outage so most users did not notice it?

grythumn · « **Reply #2 on:** 04/03/2014 05:25 pm »

Made quite a bit of news in Russia:

https://www.google.ru/#newwindow=1&q=glonass&tbm=nws

http://izvestia.ru/news/568647
http://www.dni.ru/tech/2014/4/3/268449.html
http://www.echo.msk.ru/news/1292924-echo.html

A number have nearly identical (wire service, I'd guess) articles as this:
http://www.rosbalt.ru/main/2014/04/03/1252236.html

-R C

beidou · « **Reply #3 on:** 04/03/2014 06:05 pm »

This is really a disaster and it was embarrassment to Glonass operator, as Langley just said. In the meantime, it also alarms the bell for other GNSS system operators.

MP99 · « **Reply #4 on:** 04/04/2014 08:32 am »

Quote from: Langley on 04/03/2014 02:58 pm

I suppose most car navigation units in Russia are still just GPS-based or perhaps GPS/GLONASS and the latter just ignored the GLONASS satellites during the outage so most users did not notice it?

Follow the links in the OP.

Latest smartphones combine GPS & GLONASS, and some did not ignore faulty GLONASS.

Cheers, Martin

grythumn · « **Reply #5 on:** 04/07/2014 07:41 pm »

No more official news that I've seen, but some commentary:

http://www.gislounge.com/gps-experts-call-safeguards-glonass-outage/

-R C

marshal · « **Reply #6 on:** 04/18/2014 11:00 am »

GLONASS Loses Control Again

http://gpsworld.com/glonass-loses-control-again/

grythumn · « **Reply #7 on:** 04/18/2014 03:09 pm »

Technical analysis of the earlier fault:

http://gpsworld.com/altus-positioning-systems-pinpoints-cause-for-glonass-default/

The uploaded epheremis was a few minutes ahead of their current orbit, but the corresponding timestamp was not included, which resulted in a mismatch between where the satellite said it was and where it actually was.

-R C