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Single-receiver geoacoustic inversion using modal reversal.

J Bonnel1, C Gervaise, B Nicolas

  • 1Pole STIC, ENSTA Bretagne, Université Européenne de Bretagne, 2 rue Francois Verny, 29806 Brest Cedex 9, France. julien.bonnel@ensta-bretagne.fr

The Journal of the Acoustical Society of America
|January 28, 2012
PubMed
Summary
This summary is machine-generated.

This study presents a new geoacoustic inversion method using modal reversal for shallow waters. It effectively analyzes acoustic dispersion from impulsive sources, improving environmental parameter estimation.

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Area of Science:

  • Oceanography
  • Acoustics
  • Geophysics

Background:

  • Shallow-water geoacoustic inversion is crucial for understanding marine environments.
  • Existing methods often rely on time-frequency analysis of modal dispersion curves.
  • Impulsive sources present unique challenges for acoustic signal processing.

Purpose of the Study:

  • To introduce a novel single-receiver geoacoustic inversion method.
  • To adapt dispersion analysis for low-frequency impulsive sources in shallow waters.
  • To develop a method that compensates for modal dispersion effectively.

Main Methods:

  • Utilizes received modes in the frequency domain.
  • Applies a 'modal reversal' operator parameterized by environmental properties.
  • Defines a criterion based on the constructive summation of reversed modes.

Main Results:

  • Demonstrates successful inversion by maximizing the modal summation criterion.
  • Validated against simulated data, showing robust performance.
  • Applied to and validated with experimental data from the Shallow Water 2006 experiment.

Conclusions:

  • The proposed modal reversal method offers an effective approach to geoacoustic inversion.
  • It provides an alternative to traditional time-frequency dispersion analysis.
  • The method shows promise for analyzing impulsive acoustic signals in shallow marine settings.