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

[Gordon Williams]

Hi,

Just wondering what kind of results you are getting with a static base and
rover.

Did you get an explanation for the ratio factor?  Good, bad?

Thanks,

Gordon Williams

----- Original Message ----- 
From: "Danny Miller" <dannym at austin.rr.com>
To: "Open Source GPS-related discussion and support"
<foss-gps at lists.osgeo.org>
Sent: Monday, June 20, 2011 4:02 PM
Subject: Re: [FOSS-GPS] Can't get Ambiguity Validation Ratio to move


> It's working, and I'm excited!
>
> Is there some way I can find more about "ratio factor of ambiguity
> validation"?  I understand the basics of integer ambiguity.  I'm usually
> seeing 1.2, rarely above 1.8 in this field.  Is that good?  Bad?  What
> could I expect?
>
> Danny
>
> On 6/20/2011 3:56 AM, Tomoji Takasu wrote:
> > 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
> >
> > --------------------------------------------------
> > 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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> >>
> >>
> >
> >
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