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Null-broadening in a waveguide.

J S Kim1, W S Hodgkiss, W A Kuperman

  • 1Marine Physical Laboratory/Scripps Institution of Oceanography, University of California, San Diego, La Jolla 92093-0238, USA.

The Journal of the Acoustical Society of America
|July 27, 2002
PubMed
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Null-broadening enhances matched field processing in ocean waveguides by using fictitious sources and waveguide invariants. This technique improves source localization accuracy and allows control over adaptive time reversal mirrors.

Area of Science:

  • Underwater acoustics
  • Signal processing
  • Oceanography

Background:

  • Matched field processing (MFP) is crucial for underwater source localization.
  • Traditional MFP methods can be sensitive to environmental uncertainties.
  • Null-broadening offers a way to improve the robustness of beamforming techniques.

Purpose of the Study:

  • To extend null-broadening from plane wave beamforming to ocean waveguides.
  • To apply null-broadening within the framework of matched field processing.
  • To demonstrate the effectiveness of the proposed method in simulations and experimental data.

Main Methods:

  • The method utilizes the minimum variance processor with a white noise constraint.
  • Fictitious sources are distributed based on the theory of waveguide invariants.

Related Experiment Videos

  • The approach is validated using SWellEx-96 experimental data.

    • Main Results:

    • The extended null-broadening method effectively improves matched field processing in ocean waveguides.
    • Simulations and experimental data confirm the method's performance.
    • The width of a null can be adaptively controlled in a time reversal mirror.

    Conclusions:

    • Null-broadening is a viable extension for matched field processing in complex ocean environments.
    • The technique enhances source localization accuracy and robustness.
    • Adaptive control of null width opens new possibilities for acoustic array processing.