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Soldiers pinned down by sniper fire might one day be able to pinpoint where
their attacker is hiding, using a new detector invented by BBN Technologies in
Cambridge, Massachusetts. The 鈥渃rack鈥� as the shot leaves the muzzle can be
masked by background noise, so the detector鈥檚 helmet-mounted microphones instead
track the bullet鈥檚 supersonic shock wave. If two or more soldiers wearing the
equipment are either side of the shot, 鈥渢he system gives a very good estimate of
the bullet鈥檚 trajectory鈥�, says Gregory Duckworth of BBN Technologies. 鈥淔rom
there, it works back to where the sniper is likely to be,鈥� he says. The idea is
to display the information on a flip-down helmet-mounted visor.