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Related Experiment Videos

Ocean acoustic interferometry.

Laura A Brooks1, Peter Gerstoft

  • 1Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093, USA. lbrooks@mecheng.adelaide.edu.au

The Journal of the Acoustical Society of America
|June 8, 2007
PubMed
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Ocean acoustic interferometry uses source signals to determine the Green's function between receivers. Stacking cross-correlations approximates this function, offering a new method for acoustic analysis.

Area of Science:

  • Oceanography
  • Acoustics
  • Geophysics

Background:

  • Ocean acoustic interferometry is an emerging technique.
  • It utilizes signals from multiple sources to understand wave propagation.
  • The Green's function is crucial for characterizing acoustic environments.

Purpose of the Study:

  • To present a novel approach for inferring the Green's function using ocean acoustic interferometry.
  • To theoretically describe the relationship between stacked cross-correlations and the Green's function.
  • To validate the proposed method through simulations and comparison with existing techniques.

Main Methods:

  • Employing a stationary phase argument to analyze signals from a line of vertical sources.
  • Summing (stacking) cross-correlations of signals recorded by two receivers.

Related Experiment Videos

  • Comparing the results with a modal-based approach.

    • Main Results:

    • Demonstrating that stacked cross-correlations approximate the time-domain Green's function.
    • Showing agreement between the proposed method and existing modal-based approaches.
    • Identifying conditions under which the approximation is valid (negligible modal continuum in sediments).

    Conclusions:

    • The stacked cross-correlation method provides a viable way to estimate the Green's function in ocean acoustics.
    • This technique is effective when sediment layers do not significantly affect the modal continuum.
    • The findings support the application of acoustic interferometry for characterizing underwater environments.