So if I understand it correctly all you need is two freerunners for RTK-GPS to work? Does one need to have a DGPS subscription?
Ranjan On Mon, Sep 27, 2010 at 12:24 PM, RANJAN <infi...@gmail.com> wrote: > How fast were you getting the position update using the RTK? Please let us > know. > > Ranjan > > > On Mon, Sep 27, 2010 at 5:46 AM, Timo Juhani Lindfors < > timo.lindf...@iki.fi> wrote: > >> Hi, >> >> in Finhack 2010 I gave a presentation on how I >> >> 1) modified the freerunner GPS firmware to obtain raw pseudorange and >> carrier phase measurements, >> >> 2) used two openmoko freerunners ("base" at a known location and >> "rover" that is moving around) with external antennas to capture this >> data and >> >> 3) used rtklib 2.4.0 to calculate RTK position solutions from this raw >> data. >> >> Short summary of results: >> >> 1) When both receivers were at a static position it took around 1000 >> seconds from cold start to stabilize. After that the position stayed >> inside a window of 6 cm in all directions for another 1000 seconds. >> >> 2) When the rover was moving I was able to easily trace the shape of >> an aerial photography marker painted to the ground. >> >> For more information see my posts to the foss-gps list starting at >> >> http://lists.osgeo.org/pipermail/foss-gps/2010-July/thread.html >> >> and the slides of the presentation at Finhack: >> >> http://finhack.org/2010/finhack2010-rtklib-lindfors.odp >> >> Finally, if you are still interested, read about rtklib at >> >> http://gpspp.sakura.ne.jp/rtklib/rtklib.htm >> >> >> _______________________________________________ >> Openmoko community mailing list >> community@lists.openmoko.org >> http://lists.openmoko.org/mailman/listinfo/community >> > >
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