On 4 Feb 2011, at 15:52, Dan Lyke wrote: > On Fri, 4 Feb 2011 16:17:09 +0100 Stefan Keller <[email protected]> wrote:
>> Now given that mobile phones can be connected to low-cost GPS (e.g. >> via bluetooth) it should be possible to implement at a "consumer DGPS" >> which gets an accurracy of 2m or better. > .. > Some of those low-cost consumer grade devices already integrate SBAS > (Space-Based Augmentations Services) correction like WAAS, EGNOS and > MSAS, which can put them close to 2m. These systems work by having a > ... > However, a good portion of the additional error you're seeing with > cheap GPS receivers with tiny little antennas is probably multi-path > error, and DGPS won't help you with that. I got stuck on exactly that as well. And when I improved that - things where far to large and heavy. Subsequently found that using a simple inertia motion sensor (this was for a http://paparazzi.enac.fr/wiki/Autopilots board) to do relative stuff at < 10cm combined with some very robust points from a GPS - though much less accurate - was sort of a good compromise for periods of time under a few hours. Thanks, Dw. _______________________________________________ Geowanking mailing list [email protected] http://geowanking.org/mailman/listinfo/geowanking_geowanking.org
