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Date: Tue, 12 Nov 2002 21:22:47 +0000
From: Mike Page
X-Mailer: Mozilla 4.79 [en] (Win98; U)
Subject: Re: vechile speed meter
NNTP-Posting-Date: Tue, 12 Nov 2002 21:22:06 +0000
James Meyer wrote:
> On Mon, 11 Nov 2002 03:02:21 +0100, "abacus-ri"
> >Thanks to all for fast reply.
> > I didn't mean to make a unit without sensor; just if is possible without
> >outside sensor. I was think about some kind of acceleration sensor or
> >something similar.
> You want a device completely contained and not connected directly to the
> vehicle that is able to measure the vehicle's speed.
> Acceleration is not a good solution. You have to mathematically
> integrate the acceleration in order to get the speed. Then you have to
> integrate the speed in order to get the position. The original acceleration
> measurement is very hard (expensive) to obtain with no errors. Any error in the
> original measurement will be magnified many times over when the measurement is
> Using a GPS receiver will give you very accurate information about
> position. From that, the speed can be easily and accurately calculated.
As a total outsider to GPS, I was interested to read this. What kind of response
time can be had from a GPS ? Would it notice a speed increase lasting say 10 seconds
? What about roundabouts ?
Mike Page email@example.com
BEng(Hons) MIEE www.eclectic-web.co.uk
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