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Passive Source Localization Using Acoustic Intensity in Multipath-Dominant Shallow-Water Waveguide.

Sunhyo Kim1, Sungho Cho1, Seom-Kyu Jung1

  • 1Marine Security and Safety Research Center, Korea Institute of Ocean Science and Technology, Busan 49111, Korea.

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Summary
This summary is machine-generated.

This study introduces a new passive source localization method using acoustic intensity, a vector quantity. This approach enhances accuracy in shallow waters and can determine both range and azimuth to acoustic sources.

Keywords:
array invariantparticle velocitypassive source localization

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Area of Science:

  • Ocean acoustics
  • Passive source localization
  • Array invariant technique

Background:

  • The array invariant technique has shown success in estimating source-receiver horizontal range in shallow-water waveguides.
  • A limitation of the existing technique is its requirement for a large-scale hydrophone array.
  • Passive acoustic monitoring in marine environments often faces challenges with multipath propagation.

Purpose of the Study:

  • To propose and validate a novel array invariant method utilizing acoustic intensity for passive source localization.
  • To extend the capabilities of the array invariant technique to estimate both horizontal range and azimuth to an acoustic source.
  • To investigate the feasibility of using acoustic intensity, a vector quantity, for improved source localization.

Main Methods:

  • The proposed method employs acoustic intensity, a vector representing sound wave propagation direction.
  • Particle velocity signals were derived from pressure signals using finite difference approximation.
  • Simulations and an acoustic experiment were conducted to assess the method's performance.

Main Results:

  • The acoustic intensity-based array invariant method successfully estimated source-receiver horizontal range and azimuth.
  • The method demonstrated feasibility in shallow-water waveguide environments.
  • Localization results were compared against traditional beamforming techniques using vertical line array data.

Conclusions:

  • Acoustic intensity provides a viable vector quantity for enhancing the array invariant technique in passive source localization.
  • The proposed method offers a potential solution for accurate source localization with reduced array size requirements.
  • This advancement contributes to more effective underwater acoustic surveillance and monitoring.