Hi Part of the issue with Glonass is the accuracy of the datum. It *can* be used for navigation and timing. It’s best to use it stand alone. Survey a location that is specific to it’s datum and then lock the module into timing mode. Don’t try to run with a GPS survey as your location.
All that said, still not encouraging. Bob > On Feb 16, 2018, at 2:49 PM, Gary E. Miller <[email protected]> wrote: > > Yo Bob! > > On Fri, 16 Feb 2018 13:47:24 -0500 > Bob kb8tq <[email protected]> wrote: > >> Reports to date on Glonass have not been encouraging. > > I have been testing position accuracy lately on a self contained u-blox > 8 with built-in antenna supposedly GLONASS capable. I write a Python > script to selectively enable GLONASS and GALILEO over GPS. > > All figures below are rough averages. > > Typically, with one particular GPS, in one particular spot, it gives a > CEP(50) of 10 feet. > > Enable GLONASS and that worsens to 24 feet. After about a minute the > u-blox rejects all the GLONASS, that have good SNR, and the CEP(50) > drops back to normal. > > Enable GALILEO and CEP(50) improves to 6 feet. And stays that way. > > So be sure to enable GALILEO in your GPS and disable GLONASS. > > Also note: the passband of GALILEO is technically the same as GPS, but > has more energy at the edges. Some GPS antennas cut it a little close > and hurt GALILEO performance. > > RGDS > GARY > --------------------------------------------------------------------------- > Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 > [email protected] Tel:+1 541 382 8588 > > Veritas liberabit vos. -- Quid est veritas? > "If you can’t measure it, you can’t improve it." - Lord Kelvin > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
