Hi Luciano, Yes this is typically the case. GPS is the most reliably good system currently. When the Galileo system is working nominally and the geometry over our antenna is good (remember, the constellation is not yet complete), the single frequency performance easily rivals GPS. BeiDou will likely be similar once the constellation is finished, assuming they don't intentionally degrade the civilian signals over non-Chinese regions. GLONASS, well that's another case altogether.
Keep in mind the limitations of the website's data collection - single frequency "professional grade" receivers which do not perform carrier-phase or any kind of satellite based corrections/augmentations (SBAS, etc). If the receivers were more sophisticated and in another region, the story may be different. If anyone wants to set up a similar monitoring system in another part of the world, let me know, I would be very interested in that. Kevin On Sat, Jul 13, 2019 at 1:05 AM tim...@timeok.it <tim...@timeok.it> wrote: > > Looking at the data it seems that GPS is the best system among the > four, correct? > > Luciano > > > Da "time-nuts" time-nuts-boun...@lists.febo.com > A "Discussion of precise time and frequency measurement" > time-nuts@lists.febo.com > Cc > Data Fri, 12 Jul 2019 18:29:10 -0400 > Oggetto Re: [time-nuts] Galileo service currently degraded > I built this website as my senior design project last year, > unfortunately > there's no timing data (except for tdop) being logged but you can see > the > impact. Data is collected with four ublox m8n receivers, one per > constellation. > > Galileo data from last 1 week: > https://gnssperformancemonitor.com/viewdata.php?constellation=2×pan=1 > > Kevin > > On Fri, Jul 12, 2019, 4:06 PM Hal Murray <hmur...@megapathdsl.net> > wrote: > > > > > > > > Galileo service is currently degraded, see: > https://www.gsc-europa.eu/ > > > notice-advisory-to-galileo-users-nagu-2019025 > > > > Thanks. > > > > Is anybody monitoring a Galileo-only setup to see how far off the > timing > > drifts? > > > > > > -- > > These are my opinions. I hate spam. > > > > > > > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > -- Kevin Croissant _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
