To David re: finding mortar fire

[BruceZ]

Apparently the military uses large radars or infrared for this. I wonder if it can be done with 3 microphones by triangulation. Two microphones at different locations receive the sound of a mortar launch at different times, and from this time difference the possible originating locations will lie on a hyperbola. A third microphone produces additional hyperbolas. Where the hyperbolas intersect is the originating location. This is one way that we find the location of a cell phone user. Triangulation is done with 3 antennas at 3 different locations.