[FOSS-GPS] Can't get Ambiguity Validation Ratio to move

[Tomoji Takasu]

Dear Danny

> In the data window of RTKNavi, I noticed the Lat/long/height of Base is 
> not listed with real numbers (90deg 0m).  This isn't right- that GPS has a 
> fine solution in NMEA.

You have to set the base-station position properly in
Options dialog for relative modes. RTKNAVI never uses
receiver's NMEA.

This is FAQ. So I will add FAQ in the support page.

regards,

********
Tomoji TAKASU

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From: "Danny Miller" <dannym at austin.rr.com>
Sent: Monday, June 20, 2011 5:07 PM
To: <foss-gps at lists.osgeo.org>
Subject: [FOSS-GPS] Can't get Ambiguity Validation Ratio to move

> I'm new to RTK.  I have a pair of LEA-6T GPS units, one active Sarantel 
> SL-1206 quadrafiliar helix ant.  There were supposed to be two of those 
> but the second one was DOA so I'm making do with an active patch antenna 
> for the second.  I don't have an antenna file for either of them.  I'm 
> using 2.4.1.
>
> I have UBX RXM-RAW and RXM-SFRB reading out of both of them at 5Hz (tried 
> this at 1Hz too).  I can get a fix out of either one of them.  In 
> Kinematic mode of RTKNavi, I get a position, but the "ratio factor of 
> ambiguity validation" factor is stuck at 0.0.  I waited like an hour and 
> it was still at 0.
>
> In the data window of RTKNavi, I noticed the Lat/long/height of Base is 
> not listed with real numbers (90deg 0m).  This isn't right- that GPS has a 
> fine solution in NMEA.  Both Base and Rover are showing strong (~45dbHz) 
> signal bars in all colors.
>
> I looked under Solution 1 and Solution 2 and both have valid, similar 
> solutions.
>
> I looked under errors and saw:
> eight "outlier rejected" per sample period (5Hz)
> one "no double-differenced residuals" message
>
> I tried switching the COM ports for Base and Rover, effectively switching 
> which unit was which (neither is moving right now).  Nothing changed, the 
> "Base" unit channel still has no Lat/long/height and ambiguity validation 
> is still 0.  That is, the problem is not tied to the GPS hardware unit.
>
> I tried disabling the Rover in RTKnavi.  There's still no solution under 
> the Lat/Long/Height of Base.  The signal strength bars all turn gray.
>
> I tried the mkl version (I have an i7).  It didn't change anything.
> I tried 2.4.0 rtknavi.  In that one, I can't get a rover solution to show 
> up at all, it's blank on the main window and rtkplot shows nothing.
>
> Any ideas?
>
> Danny
>
>
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