Re: [Paparazzi-devel] GPS precision

[Achim Walther]

Ethan,

I recall you're from Germany. If so, you may have a look at this discussion 
from a german robot forum: 
http://www.roboternetz.de/phpBB2/zeigebeitrag.php?p=273522#273522 . Here, 
Christian states that a DIY differential GPS did not work for him. That 
surprised me because I had different information from the Net.

However, you will have to try it yourself. Choosing two identical GPS receivers 
would probably be an advantage. Anyway, common GPS receivers use SBAS which 
should give a horizontal precision of 3 meters. That's almost as good as DGPS...

Regards, Achim.

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http://www.voidpointer.de

-------- Original-Nachricht --------
> Datum: Tue, 4 Sep 2007 09:56:45 +0200
> Von: "Ethan Arnold" <address@hidden>
> An: address@hidden
> Betreff: [Paparazzi-devel] GPS precision

> Dear List,
> 
> Has anyone ever tried laying 2 GPS receivers (same model) side by side and
> comparing the output over a reasonable period of time?
> 
> I noticed (with one receiver, under good reception) the measured GPS
> position slowly (under 1m/s) wanders around in an area of about 10-20m
> diameter. I was wondering if a second GPS receiver of the same model would
> show the same deviation at the same time. If this were the case, couldnt
> one
> use the stationary receiver as a reference point to correct the mobile
> GPS,
> as long as they are relatively close together (<1km), and hereby be able
> to
> detect the slow horizontal drifting of a helicopter, which otherwise
> couldnt
> be detected with only the on-board GPS receiver?
> 
> Regards,
> Ethan

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