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

Brent Fraser bfraser at geoanalytic.com
Thu Oct 9 13:16:05 EDT 2008


  Interesting stuff!  I've experimented with Antonio Tabernero Galan's GAR2RNX to get sub-meter results with a $100 Garmin GPS receiver. See http://lists.burri.to/pipermail/geowanking/2007-August/004314.html for more info.

Other sites of interest for open source precision GPS:


And in the spirit of Open source, you might give your Matlab code a try in Octave (http://www.gnu.org/software/octave/index.html)

Best Regards,
Brent Fraser

Eugenio Realini wrote:
> I'm Eugenio Realini, Ph.D. student at Politecnico di Milano, Geomatics 
> Laboratory [1] at Como campus (Italy).
> I was simply amazed when I found out this list a few hours ago, since we 
> just decided (few days ago) to continue the development of a GPS 
> navigation software we have worked on for more than one year as FOSS.
> The software was born as a research/teaching tool to study Kalman 
> filtering algorithms on GPS observations and today it has become a 
> real-time navigation software that tries to exploit at best low cost GPS 
> chipsets in order to obtain highly accurate positioning (20 - 50 cm). 
> This is done by applying double differences with respect to a (network 
> of) permanent station(s) and linear/surface constraints. It works 
> directly on the raw data (code and carrier phase) that can be obtained 
> from some GPS chipsets (we are now using u-blox LEA-4T [2]) and relies 
> on a GPRS/UMTS Internet connection to get data for the differential 
> positioning.
> The software is still highly prototypal and it has been written in the 
> framework of two Master's degree theses (a third one has just started). 
> Up to now it has been developed in a MATLAB environment, but it is going 
> to be converted in ANSI C during the next months.
> We are thinking about designing it to run on Openmoko, but first we have 
> to understand if there is any way of obtaining raw data from the u-blox 
> GPS chipset it carries inside.
> bye
> Eugenio
> [1] http://geomatica.como.polimi.it/
> [2] http://www.u-blox.com/products/lea_4t.html
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