[FOSS-GPS] High accuracy positioning with low cost GPS devices: a FOSS project

[Joseph Reeves]

Jaykob,

Your project sounds very interesting, please keep us updated with how
you get on.

> I'm working with two netbooks (eeePCs), one as base station and the other
> one as rover. Communication will be over bluetooth or WLAN so pretty short
> baselines (not much more than 100m) have to be considered.
> I'm aiming for an accuracy of about 50cm.

We're thinking about exactly the same using the Openmoko phone,
although we also have a potential supply of Dell Mininotes that could
be used in a similar manner. I like the phone though as everything you
need (hopefully) is all built into the handset :-)

Cheers,

Joseph



2008/12/17 Jaykob <jraible at gmx.de>:
>
> Hi Eugenio and all the others!
>
> I'm currently writing my diploma thesis about pretty much the same stuff.
> My aim is to develop a realtime GPS solution for robotic outdoor
> environments with consumer grade single frequency receivers.
> I have two AEK-4T (LEA-4T) U-Blox receivers as well.
> I'm pretty much at the beginning and I'm still in the phase of reading a
> lot. I came about this mailing list and your goGPS site as well as
> coyotebush's Kinematic site (precision-gps.org).
> Because I don't want to invent the wheel again as it would be probably too
> much for my thesis anyway I want to ask you guys for some hints.
>
> I'm working with two netbooks (eeePCs), one as base station and the other
> one as rover. Communication will be over bluetooth or WLAN so pretty short
> baselines (not much more than 100m) have to be considered.
> I'm aiming for an accuracy of about 50cm. Is that possible with the LEA-4Ts
> and the standard ANN-MS antennas? What techniques / algorithms would you
> suppose? Can anybody tell me how accurate Kinematic (precision-gps.org)
> would be taking the recent Snapshot #8? Does anybody have an advice how one
> could improve this program or where the problems are?
>
> I also had a look for the GPSTk and wrote a RINEX generator for the LEA-4Ts
> for it. I took the existing rtAshtech program and modified it for the U-Blox
> receivers. It's still under development but it's already generating the
> observation and navigation files. I also tried out the DDBase program (also
> in the GPSTk) for a static situation with a very short baseline (20cm). When
> I entered a pretty good position estimate for the rover the result was
> really good but taking the pseudorange rover estimate didn't give good
> solutions for relatively short observations. It's not what I need because
> it's a post-processing program but does anybody know if I could take parts
> out of it and make it realtime (or near realtime)? I also read about kvecsol
> in a paper which is vecsol (also from the GPSTk) but modified for rtk. But
> vecsol only seems to work with dual frequency data...
>
> In short: I'm very thankful for any ideas and hints that could help me for
> that purpose.
>
> Eugenio: Do you publish your thesis and software when you're done?
>
> Thanks in advance!
> Jakob
>
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