[FOSS-GPS] High SNR Satellites not being used

[Felipe G. Nievinski]

Most of the time a satellite set unhealthy by the control segment can still
be tracked fine, it's just that its actual orbit is expected not to be as
well described by the broadcast ephemerides due to a sudden maneuver.

Also, you didn't mention if the data were being processed in point
positioning; in relative positioning, a satellite has to be visible from
both stations (rover and base) to be usable.

-F.


> ------------------------------
>
> Message: 2
> Date: Tue, 23 Sep 2014 16:43:02 -0400
> From: "Sean Hyde" <sean.a.hyde at gmail.com>
> To: "'Open Source GPS-related discussion and support'"
>         <foss-gps at lists.osgeo.org>
> Subject: Re: [FOSS-GPS] High SNR Satellites not being used
> Message-ID: <02c001cfd76e$f8b1ccd0$ea156670$@gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> That?s a great resource!
>
>
>
> Unfortunately, the period was approx. 12-4PM on Sept 23, 2014 (Eastern US)
> and 06 is actually tracking OK.  02, 05 and 25 are all showing 50 dBHz and
> yet not being used.  Very strange.
>
>
>
> -Sean
>
>
>
> From: foss-gps-bounces at lists.osgeo.org [mailto:
> foss-gps-bounces at lists.osgeo.org] On Behalf Of Felipe G. Nievinski
> Sent: Tuesday, September 23, 2014 4:39 PM
> To: foss-gps at lists.osgeo.org
> Subject: Re: [FOSS-GPS] High SNR Satellites not being used
>
>
>
> Maybe PRN06 was set unhealthy?
>
> You didn't mention the tracking period.
>
>
>
> Check the NANUs, e.g.:
>
> <http://celestrak.com/GPS/NANU/2014/nanu.2014057.txt>
>
>
>
> CONDITION: GPS SATELLITE SVN67 (PRN06) WAS UNUSABLE ON JDAY 198 (17 JUL
> 2014) BEGINNING 0950 ZULU UNTIL JDAY 198 (17 JUL 2014) ENDING 1507 ZULU.
>
>
>
> Historical outages here:
>
>
>
> <http://adn.agi.com/SatelliteOutageCalendar/GPSHistoricalOutages.aspx>
>
>
>
> -F.
>
> Message: 1
> Date: Tue, 23 Sep 2014 16:00:05 -0400
> From: "Sean Hyde" <sean.a.hyde at gmail.com <mailto:sean.a.hyde at gmail.com> >
> To: <foss-gps at lists.osgeo.org <mailto:foss-gps at lists.osgeo.org> >
> Subject: [FOSS-GPS] High SNR Satellites not being used
> Message-ID: <02ac01cfd768$f8740f40$e95c2dc0$@gmail.com <http://gmail.com>
> >
> Content-Type: text/plain; charset="us-ascii"
>
> Hey Guys,
>
>
>
> I noticed today that despite some satellites having >40 dBHz (as reported
> in
> RTKNavi), they are not green and are not being used.  They are also not
> marked as 'OK' in the RTKMonitor.  Any idea why?  I do not have any
> specifically excluded in the 'Options' settings and I have the Elevation
> Mask set to zero.
>
>
>
> I've attached a screenshot of the SNR from RTKNavi (the Rover is inside a
> building so that's why it is so low, but the base station is outside).
>
>
>
> Thanks,
>
> -Sean
>
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