[FOSS-GPS] High SNR Satellites not being used

[Sean Hyde]

Interesting.  After about 30 mins, G02 became ‘OK’.

 

I am currently respinning my board for the NV08C.  If it works, the new one will support up to 4.5V to the antenna allowing me to better amplify the antennas I have and to use a Novatel GPS-600LB I acquired.

 

Hopefully this will improve base station positioning.

 

 

From: foss-gps-bounces at lists.osgeo.org [mailto:foss-gps-bounces at lists.osgeo.org] On Behalf Of Felipe G. Nievinski
Sent: Wednesday, September 24, 2014 3:10 PM
To: foss-gps at lists.osgeo.org
Subject: Re: [FOSS-GPS] High SNR Satellites not being used

 

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.

 

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Message: 2
Date: Tue, 23 Sep 2014 16:43:02 -0400
From: "Sean Hyde" <sean.a.hyde at gmail.com <mailto:sean.a.hyde at gmail.com> >
To: "'Open Source GPS-related discussion and support'"
        <foss-gps at lists.osgeo.org <mailto:foss-gps at lists.osgeo.org> >
Subject: Re: [FOSS-GPS] High SNR Satellites not being used
Message-ID: <02c001cfd76e$f8b1ccd0$ea156670$@gmail.com <http://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>  [mailto: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 <mailto: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>  <mailto: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>  <mailto: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>  <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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