[FOSS-GPS] Re: New Project with RTKlib & need help.

Mauro Ugarte Avilés mauro.ugarte at cefop.udec.cl
Mon Jan 2 14:55:06 EST 2012

> Taking your words, I'm not good at GPS relative terms and algorithms too.
Me neither :-)
> I think that the moving base must have an fixed and known lenght .
If you review the "setting2" tab on RTKNAVI 2.4.x options, you will see 
that the "Baseline Length Constraint (m)" is an option, not a 
requirement, even when  "Moving Base" is selected as positioning mode on 
"setting1" tab. Considering this, I thought that both options where 
valid (constrained and unconstrained length). One may think that is just 
a programming bug if it remains as an option and not as a requirement, 
but if you select "moving base" you will see that on the "Positions" tab 
automatically the option to input the base antenna position dissapeared, 
from which I conclude that nothing is left to chance on this swiss knife 
that RTKlib is :-).
> This will not be your case.
> May be you can use a fixed base ( two antennas on one car ), but in this case, it would be better to put it over  an reference station and let both car as rovers.
> I have realised some tests with one ublox-4T. I just have one and it was quite difficult to buy this one  :-(
> I have stoped it for a while, but RTKLIB is great and nice  and I plan use it.
> I got very good results, cm accuracy for a 10 km base line.
> I have modified a python code to set it up to output raw carrier phase and navegation data. It runs under *NIX.
> The basic code is here
> http://wiki.openmoko.org/wiki/Neo_FreeRunner_GPS
> regards,
> julio menezes
> PS: you can see my results here:
> gpl2.com.br/americo
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