Acoustic Source Elevation Angle Estimates Using Two Microphones

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.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2014
Accession Number
ADA605326

Entities

People

  • Kirsten A. Walker
  • W. C. Alberts Ii

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Sensors
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Arrays
  • Acoustic Impedance
  • Acoustics
  • Coefficients
  • Elevation
  • Frequency
  • Geometry
  • Ground Based
  • Impedance
  • Measurement
  • Plane Waves
  • Reflection
  • Standards
  • Test Facilities
  • Three Dimensional
  • Transfer Functions
  • Waves

Readers

  • Aviation Safety and Air Traffic Management
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Speech Processing/Speech Recognition.