Determining vehicle speed based on sound
David VanHorn email (remove spam text)
At 09:48 PM 2/11/01 -0500, Sean Breheny wrote:
>I'm doing a project in a DSP class to determine the speed of a vehicle
>(like a car) based on just the sound which a stationary observer would
>hear as it passes. I have a vague recollection that something similar was
>mentioned here, but I can't find it in the archives.
ELTs are found by SARSATS that way. Started as a ham project IIRC..
The slope of the change in frequency as the sat passes, tells how far off
the sat is from a direct overhead pass.
The finding the zero crossing of that slope would let you take the
magnitude of the slope as the speed.
As a bonus, you should be able to tell which lane the car was in :)
Dave's Engineering Page: http://www.dvanhorn.org
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