RTK-GPS with freerunner: decimeter-level accuracy with Free Software

RANJAN infibit at gmail.com
Mon Sep 27 21:24:26 CEST 2010


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.lindfors at 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 at lists.openmoko.org
> http://lists.openmoko.org/mailman/listinfo/community
>
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