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Y H Choi1, J S Kim1, Gihoon Byun2

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Summary
This summary is machine-generated.

This study improves high-frequency signal localization using frequency-wavenumber (f-k) spectrum analysis. Beam steering enhances spatial resolution, enabling accurate near-field source localization, as demonstrated with snapping shrimp sounds.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Oceanography

Background:

  • Locating high-frequency signals with sparse arrays is challenging due to reduced spatial resolution in frequency-wavenumber (f-k) spectrum analysis.
  • The f-k spectrum offers simultaneous direction and frequency determination but shifts in sparse situations, complicating source localization.

Purpose of the Study:

  • To enhance near-field source localization accuracy for high-frequency signals using f-k spectrum analysis.
  • To evaluate the effectiveness of beam steering in improving spatial resolution for f-k spectrum-based localization.

Main Methods:

  • Utilized frequency-wavenumber (f-k) spectra for analyzing high-frequency signals.
  • Applied beam steering prior to f-k spectrum creation to enhance spatial resolution.
  • Used snapping shrimp sounds (5-24 kHz) from the SAVEX15 experiment and simulations for evaluation.

Main Results:

  • Beam steering significantly improved spatial resolution in f-k spectrum analysis.
  • Accurate near-field source localization was achieved when utilizing beam steering.
  • Successfully determined the location (38m range, 100m depth) and array tilt of snapping shrimp sounds.

Conclusions:

  • The proposed method, incorporating beam steering with f-k spectrum analysis, effectively enhances near-field source localization.
  • This technique provides accurate estimation of sound source locations, even for broadband signals in shallow water.
  • The findings are valuable for underwater acoustic monitoring and source identification.