Many modern GPS modules don't really make any distinction between the glonass and the GPS satellites, they just treat them as multiple timing sources in the grand scheme of things, and use them all as part of the solution. So when adding a constellation you basically just get more satellites to choose from, not any real additional redundancy. It's not like you typically have two separate receivers operating independently.
My current have-been-writing-firmware-for-years wild ass guess is that something happened at 4pm which caused an internal software failure, which cleared this afternoon for some reason. I'm still working through possibilities, having headed down a couple of dead ends so far. On Wed, Jan 1, 2020 at 10:05 PM George Skorup <[email protected]> wrote: > Yes. Most sites were tracking either zero or 1-2 GLONASS sats until they > all suddenly came back this afternoon. > > GLONASS was not tracking nearly as many sats during the PRN#29 event > either, or we wouldn't have had so many issues. We had many RackInjectors > showing a 2D lock and no timing pulse. 2 GLONASS sats and one GPS sat > tracked intermittently. Same with a handful of ePMP APs that also needed > reboots to clear the GPS error. So much for multi-GNSS fault tolerance. > > Why did both of these things happen at the same time? Coincidence or > conspiracy? > > On Wed, Jan 1, 2020 at 9:18 PM Nate Burke <[email protected]> wrote: > >> No user intervention on my part. >> >> Visible satellites returned to normal levels over a few hours this >> morning. Tracked satellites returned to normal suddenly at 3pm CST >> (21:00 UTC) >> >> Everyone else see something similar? All my data is from EPMP 1k, 2k, >> 3k radios. They all did the same thing at the same time. >> >> On 1/1/2020 11:14 AM, Mike Hammett wrote: >> > Look through this Twitter account and the replies to the tweets for >> more information on yesterday's GPS outage. >> > >> > https://twitter.com/GalileoSats/status/1212337302460080130?s=19 >> > >> > ----- >> > Mike Hammett >> > Intelligent Computing Solutions >> > Midwest Internet Exchange >> > The Brothers WISP >> > >> > ----- Original Message ----- >> > From: Eric Muehleisen <[email protected]> >> > To: AnimalFarm Microwave Users Group <[email protected]> >> > Sent: Tue, 31 Dec 2019 15:17:39 -0600 (CST) >> > Subject: [AFMUG] mass GPS issues >> > >> > Anyone else having GPS issues this afternoon? Nearly every tower I have >> > across western Kansas is having GPS issues. Start around 3pm CST. >> > >> > >> >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com > -- - Forrest
-- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
