[FOSS-GPS] High SNR Satellites not being used

[Sean Hyde]

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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