Hi Dave,

I didn't know about the ELTs. I already have my method working for
monotonic signals (i.e., if a sine wave generator goes by, it can
determine the speed easily),the problem is that I don't have many
suitable recordings of actual cars (which is a much more difficult case,
since I have to determine speed from the engine noise and sound of the
air going over the car). I don't have any recordings where I know (from
some independent source) what speed the car was going.

Yeah, I could go out and record by the side of a highway, but I still
wouldn't know exactly how fast they were going, and I don't have enough
time before the due date to get a radar gun or something like that, or to
recruit other people to record a car at known speeds.
(Come to think of it, it would be gratifying to see all those brake
lights come on when I keyed the radar transmitter ;-)

Any idea where I can get such recordings?

Thanks,

Sean


On Sun, 11 Feb 2001, David VanHorn wrote:
> 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 :)
>
>
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