On 15 Apr 2008 at 14:40, Jinx wrote:

> > have 3 or more microphones, piezo's, or other vibration sensors
> > connected to it. Monitor received analog signals with a fast micro
> 
> The US military have a microphone system called Boomerang for
> triangulating snipers. I saw it on 60 Minutes not so long ago
> 
> http://www.gizmag.com/go/4497/
> 
> http://www.youtube.com/watch?v=dYgsGoAlb1s
> 
> I don't know if it's precise enough for targets though. Two IR
> curtains (one vertical, one horizontal) may be better

Very cool, but not so useful if the first shot hits you or your Boomerang.

Speed of sound in steel is approx 5100m/s, so with a 1m target greatest time 
differential would be around 200us. Probbaly use a little analog electronics to shape 
the pulses and trigger timing. For a given target, similar type of rifle and ammunition 
each time, I think it should be feasible to build something that works repeatably, 
resolution probably around a cm or two.

-- 
Brent Brown, Electronic Design Solutions
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Hamilton 3200, New Zealand
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