I wonder if a case could be made for multi-GNSS reception in the case of a poorly- located GPS antenna at the reception site. That is, could the benefits of having a lot more sats in the sky outweigh poorer performance of some of the systems with respect to other systems?
Dana On Sat, Jul 13, 2019 at 1:02 AM Kevin Croissant <ke...@kevincroissant.com> wrote: > 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. > _______________________________________________ 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.
