Direction finder for incoming gunfire

Details Direction finder for incoming gunfire Direction finder for incoming gunfire

2008-11-21

2011-11-01

Lobo, Ian (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

By combining or comparing signals

C367S906000

Reexamination Certificate

active

08050141

ABSTRACT:
A system and method is provided for estimating a trajectory of an incoming bullet based on the acoustics of the shock wave created as the bullet travels through the air. A first auditory signal representing a direct sound from the shock wave is recorded and its azimuthal direction is determined. Based on this azimuthal direction and other assumptions two possible bullet directions that can cause that shock wave are estimated. A second auditory signal representing a reflection of the shock wave as it travels through the air also is recorded and its azimuthal direction determined. The azimuthal direction of the ground reflection will lie between the azimuthal direction of the first auditory signal and the more correct of the two estimated trajectories, and thus can resolve the ambiguity in the estimated direction of the bullet source.

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