[FOSS-GPS] help with RTKPOST of GPS file please

David Kelley DavidKelley at iTSware.net
Sun Apr 17 20:13:09 PDT 2016

On 4/17/2016 3:07 PM, Michele Bavaro wrote:
   2. the C/N0s peak at 40dBHz which is symptom of a very poor antenna.
[Michele, Can you recheck the dropbox URL you posted]

arwooldridge at googlemail.com wrote:
Just a thought re improving the fix: - If the airframe is pitching and 
rolling you may want to experiment with a slightly higher elevation mask.

These two very good comments lead me to ask what the rover antenna is 
and any data you can provide about the ground plane. [and if there is 
any antex data for it]

To be blunt, if your antenna is a small patch type, it may be that you 
are seeing the phase center vary by several decimeters with the changes 
in yaw and elevation angles between the rover and the SVs as your 
platform moves about.  This can be calibrated out, but that is a rather 
advanced topic.   Looking at trends in the per-SV residuals when at the 
same heading angle from pass to pass is perhaps the best way to get a 
look into this.  That would go a long way to explain the lack of an AR fix.

But it sounds like the community is giving you fast and darn good 
feedback/help on your data set.
Regards, David Kelley

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