The car magazines use an "optical 5th wheel" like you describe to get their
performance stats. You can usually see it suction cupped to the side of a
car in the photos of the car during the testing.
----
John Steczkowski
Director, Server I/O
Crossroads Systems, Inc.
512-794-2742
> -----Original Message-----
> From: Mark Sirota [mailto:msirota@isc.upenn.edu]
> Sent: Saturday, August 07, 1999 9:46 AM
> To: Byron Short
> Cc: Craig Blome; autox@autox.team.net; marka@telerama.com
> Subject: Re: GEEZ course map & accuracy
>
>
> Byron Short wrote:
> > I know of a system built by real serious folks that used three
> > accelerometers and three yaw rate sensors which was accurate to this
> > level. (About 1 meter after 5 miles of travel I'm told.) That's
> > really cool stuff! But it's not gonna happen from a two pole
> > accelerometer. It's not even gonna happen with three poles, and a
> > single yaw rate sensor. It'll take the whole enchilada.
>
> One really clever way of doing this that I've seen is to have a very
> high res, high speed camera pointed straight down at the ground. By
> analyzing the movement of the ground relative to the car, one can
> determine the exact path travelled. Hardware's not tough, but the
> software would be.
>
> I forget where I first saw this technique. In some car or racing
> magazine, I'm sure...
>
> Mark
>
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