Acoustic Source Elevation Angle Estimates Using Two Microphones

Report No. ARL-TR-6976
Authors: Kirsten A. Walker and W.C. Kirkpatrick Alberts, II
Date/Pages: June 2014; 24 pages
Abstract: Acoustic elevation angle estimates of airborne sources can be significantly degraded by interference between direct and ground-reflected signals. It has been shown, using a microphone vertically separated from a ground-based microphone, that elevation angle estimates of a passing aircraft could be improved by invoking the plane wave reflection coefficient and the geometry of the microphones. That approach is generalized here to include situations where the microphones are separated in two dimensions and where both microphones are elevated. Elevation angles are successfully estimated, under certain conditions, for a loudspeaker broadcasting band limited white noise.
Distribution: Approved for public release
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Last Update / Reviewed: June 1, 2014