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From: James Meyer
Subject: Re: vechile speed meter
X-Newsreader: Forte Agent 1.92/32.572
Date: Mon, 11 Nov 2002 12:43:22 GMT
NNTP-Posting-Date: Mon, 11 Nov 2002 07:43:22 EST
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
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.
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