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

RANJAN infibit at gmail.com
Mon Sep 27 21:28:07 CEST 2010


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 <infibit at 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.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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