[Geowanking] Low-cost GPS receivers and software for DGPS?
sfkeller at gmail.com
Sun Feb 13 03:01:19 PST 2011
Sorry for asking again.
I'm just wondering about a fundamental configuration decision.
My configuration idea is to have two low cost GPS receivers, where one
of them is on a known position. Both issue just GPS position and log
Is it enough to process just position and log time data (NMEA) from
base station as input to a tool like RTKlib (online or
Or is DGPS really only possible with GPS receivers (at base station)
which output ephemerides etc.?
P.S. To Dan: Which inertia motion sensor and software did you (and and
typical Autopilots) use to do this sort of dead reckoning?
2011/2/4 Dirk-Willem van Gulik <dirkx at webweaving.org>:
> 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.
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