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Beamforming and matched field processing in multipath environments using stable components of wave fields.

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Summary

This study introduces a modified matched field processing method for acoustic waveguides, enhancing robustness against environmental model inaccuracies by comparing stable field components rather than the full fields.

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Area of Science:

  • Acoustics
  • Wave Propagation
  • Signal Processing

Background:

  • Traditional beamforming in acoustic waveguides relies on field representation as ray beam superpositions.
  • Matched field processing (MFP) is sensitive to environmental model inaccuracies.

Purpose of the Study:

  • To propose a modified MFP method for acoustic waveguides.
  • To improve robustness against environmental model errors.
  • To leverage stable field components for inverse problems and beam excitation.

Main Methods:

  • Representing the acoustic field as a superposition of stable components (narrow ray beams).
  • Modifying MFP by comparing stable field components instead of the full measured and calculated fields.
  • Utilizing arrival times of stable components for pulsed sources in inverse problems.

Main Results:

  • The modified MFP approach demonstrates reduced sensitivity to environmental model inaccuracies.
  • Stable components of pulsed signals provide arrival times for inverse problem solving.
  • Stable components enable the excitation of narrow continuous wave beams along specified ray paths.

Conclusions:

  • The proposed method enhances the reliability of acoustic beamforming in waveguides.
  • Stable field components offer a more robust basis for signal processing and source localization.
  • This technique facilitates controlled beam generation for targeted acoustic wave propagation.