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Shallow Water Paddling Variants of Water Maze Tests in Mice
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Localization of multiple ships using a vertical array in shallow water.

Gihoon Byun1, H C Song1, Sung-Hoon Byun2

  • 1Scripps Institution of Oceanography, La Jolla, California 92093-0238, USA.

The Journal of the Acoustical Society of America
|July 1, 2019
PubMed
Summary

This study extends blind deconvolution to locate multiple ships using successive interference cancellation. The method successfully estimated the range of two ships in shallow water using a vertical array.

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Area of Science:

  • Ocean acoustics
  • Signal processing
  • Array processing

Background:

  • Blind deconvolution is a signal processing technique used to estimate unknown source waveforms and transfer functions.
  • Conventional methods struggle with multipath interference in complex acoustic environments, such as shallow water with multiple sources.

Purpose of the Study:

  • To extend blind deconvolution techniques for localizing multiple ships in scenarios with significant multipath interference.
  • To adapt successive interference cancellation for separating and analyzing signals from multiple broadband noise sources.

Main Methods:

  • Conventional plane-wave beamforming was used for initial beam steering and phase estimation.
  • Successive interference cancellation was adopted to handle multipath arrivals masked by other ships.
  • The array invariant method, combined with beam-time migration, was applied to estimate source ranges after Green's function extraction.

Main Results:

  • The study successfully demonstrated simultaneous localization of two ships radiating broadband noise (200-900 Hz).
  • The method was validated using a 16-element, 56-m long vertical array in approximately 100-m deep shallow water.

Conclusions:

  • The extended blind deconvolution approach with successive interference cancellation is effective for multiple-ship localization in challenging shallow-water environments.
  • Accurate source range estimation is achievable even with overlapping multipath arrivals from different vessels.