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Frequency-wavenumber processing for infrasound distributed arrays.

R Daniel Costley1, W Garth Frazier, Kevin Dillion

  • 1U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, Mississippi 39180-6199 dan.costley@usace.army.mil.

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This study applies a frequency-wavenumber technique to infrasound arrays for detecting infrasound and estimating its direction. The method shows feasibility for analyzing infrasound signals and their travel direction.

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Area of Science:

  • Geophysics
  • Signal Processing
  • Acoustics

Background:

  • Infrasound detection and direction estimation are crucial for monitoring natural and anthropogenic events.
  • Traditional methods may face limitations in complex noise environments.

Purpose of the Study:

  • To apply and evaluate a frequency-wavenumber signal processing technique for infrasound analysis.
  • To assess the technique's performance in detecting infrasound and estimating its direction of travel.

Main Methods:

  • Utilized rectangular infrasound arrays with 100 sensors in square configurations (2m spacing).
  • Collected wind noise data and superposed synthetic infrasound signals to test accuracy and sensitivity.
  • Applied the frequency-wavenumber technique to real-world impulsive infrasound event data.

Main Results:

  • The frequency-wavenumber technique demonstrated accuracy and sensitivity in controlled signal-to-noise ratio tests.
  • Preliminary application to an impulsive event showed promising results.

Conclusions:

  • The frequency-wavenumber signal processing technique is feasible for infrasound detection and direction estimation using rectangular arrays.
  • This approach offers a viable method for analyzing infrasound propagation.