[Geowanking] Low-cost GPS receivers and software for DGPS?

[Dirk-Willem van Gulik]

On 4 Feb 2011, at 15:52, Dan Lyke wrote:

> On Fri, 4 Feb 2011 16:17:09 +0100 Stefan Keller <sfkeller at gmail.com> 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.