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Cellular forums Home > Archive > GPS > June 2007 > DGPS receiver
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| Tobias Wendorff 2007-06-08, 4:33 am |
| Hi there,
I've read soem stuff about DGPS and post-correction is pretty
interesting.
The problem is that cheap GSP-receiver doesn't store the used
satellite etc. - so it's impossible to correct the data on
the PC.
Does anybody of your know a cheap DGPS-receiver? On the web,
there are some words about do-it-your-self, but all the links
are down (I think, it's from 1999?).
Best regards,
Tobias
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| Sam Wormley 2007-06-08, 4:33 am |
| Tobias Wendorff wrote:
> Hi there,
>
> I've read soem stuff about DGPS and post-correction is pretty
> interesting.
>
> The problem is that cheap GSP-receiver doesn't store the used
> satellite etc. - so it's impossible to correct the data on
> the PC.
>
> Does anybody of your know a cheap DGPS-receiver? On the web,
> there are some words about do-it-your-self, but all the links
> are down (I think, it's from 1999?).
>
> Best regards,
> Tobias
To clarify you are referring to post processing of collected GPS
data, which is just one form of DGPS. Some examples:
http://www.trimble.com/mgis.shtml
http://trimble.resultspage.com/sear...post+processing
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| Stichting ST 2007-06-08, 4:33 am |
| On Fri, 8 Jun 2007 08:55:43 +0200, "Tobias Wendorff" <tobwenSPAM@gmx.de>
wrote:
>Sam Wormley wrote:
>
>Yeah, that's correct.
>
>In my eyes, "offline processing" is a fast and acceptable way.
>I don't need the data in realtime.
What you will need for sure is something that recieves L1 and L2 frequencies.
If not available then you might try a poor man solution f.i. see the results
at http://www.xs4all.nl/~atarist/geo/gps_accuracy.htm
Piet
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| Pieter 2007-06-08, 3:33 pm |
| Actually at least one older but very common Garmin model (12xl) can be faked
into providing the correct data stream for post processing.
There are a variety of meanings for "DGPS receiver." I usually mean a
stand-alone receiver for differential real time more-or-less local
correction signals. These are processed by a "DGPS ready" GPS to provide
correction. This kind of DGPS has been largely replaced by the WAAS signal
which often will provide better results that the old Coast Guard sub-AM band
DGPS signals (later morfed into NDGPS system).
A DGPS receiver as described above provides real time corrections, and will
not provide the data necessary for post processing. Given the accuracy of
WAAS, if this suits your application, forget DGPS and stick with WAAS.
If, however, you are thinking of using post processing to get to reliable
sub-meter accuracy, then you might want to look at the Trimble web site.
That's quite a different technology than "retail" GPSs use.
"Tobias Wendorff" <tobwenSPAM@gmx.de> wrote in message
news:f4aj71$uk3$1@on
line.de...
> Hi there,
>
> I've read soem stuff about DGPS and post-correction is pretty
> interesting.
>
> The problem is that cheap GSP-receiver doesn't store the used
> satellite etc. - so it's impossible to correct the data on
> the PC.
>
> Does anybody of your know a cheap DGPS-receiver? On the web,
> there are some words about do-it-your-self, but all the links
> are down (I think, it's from 1999?).
>
> Best regards,
> Tobias
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