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Cascade of blind deconvolution and array invariant for robust source-range estimation.

H C Song1, Chomgun Cho1, Gihoon Byun2

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

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Summary
This summary is machine-generated.

This study enhances underwater acoustic source localization by using blind deconvolution to estimate the Green's function from unknown source waveforms. This improves robust source-range estimation in shallow water environments.

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Area of Science:

  • Acoustics
  • Oceanography
  • Signal Processing

Background:

  • Robust source localization in shallow water relies on array invariants and dispersion characteristics.
  • Conventional methods often require known source waveforms or probe signals to resolve multipath arrivals.
  • Extracting the Green's function is crucial for accurate source localization.

Purpose of the Study:

  • To extend the array invariant method for robust source-range estimation using unknown source waveforms.
  • To demonstrate the effectiveness of blind deconvolution in extracting the Green's function from complex signals.
  • To validate the proposed method in a realistic shallow water acoustic environment.

Main Methods:

  • Utilizing conventional plane-wave beamforming with a vertical array.
  • Implementing beam-time migration to exploit separated arrivals in beam angle and travel time.
  • Applying blind deconvolution to extract the Green's function from unknown source waveforms.
  • Cascading blind deconvolution with the array invariant method for source-range estimation.

Main Results:

  • Successfully extended the array invariant method to handle unknown source waveforms.
  • Demonstrated robust source-range estimation using blind deconvolution and array invariant.
  • Validated the approach with a 16-element vertical array in shallow water (approx. 100m depth).
  • Achieved accurate localization for a towed source at ranges of 1.5-3.5 km using broadband communication waveforms (0.5-2 kHz).

Conclusions:

  • Blind deconvolution effectively extracts the Green's function for unknown source waveforms.
  • The combined blind deconvolution and array invariant method provides robust source-range estimation in shallow water.
  • This technique offers a significant advancement for underwater acoustic localization applications.