[time-nuts] Galileo service currently degraded
Dana Whitlow
k8yumdoober at gmail.com
Sat Jul 13 10:34:10 UTC 2019
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 <kevin at 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 timeok at timeok.it <timeok at 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-bounces at lists.febo.com
> > A "Discussion of precise time and frequency measurement"
> > time-nuts at 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 <hmurray at 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.
> > >
> > >
> > >
> > >
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>
>
> --
> Kevin Croissant
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