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RE: [Paparazzi-devel] GPS precision

From: Joshua Lamorie
Subject: RE: [Paparazzi-devel] GPS precision
Date: Tue, 4 Sep 2007 12:30:36 -0400

I tried this several years ago with two U-Blox SAM-LS receivers.  The
drift and wander of the position and velocity measurements were
completely independent.  


> Has anyone ever tried laying 2 GPS receivers (same model) side by side
> 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
> show the same deviation at the same time. If this were the case,
> one
> use the stationary receiver as a reference point to correct the mobile
> as long as they are relatively close together (<1km), and hereby be
> to
> detect the slow horizontal drifting of a helicopter, which otherwise
> couldnt
> be detected with only the on-board GPS receiver?

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