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Green's function estimation using secondary sources in a shallow water environment.

Philippe Roux1, Mathias Fink

  • 1Laboratoire Ondes et Acoustique, ESPCI, Université Paris VII, 10 rue Vauquelin, 75005 Paris, France. philippe.roux@espci.fr

The Journal of the Acoustical Society of America
|March 27, 2003
PubMed
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This study introduces a novel method to measure acoustic Green's functions without direct pulse emission. By averaging signal correlations or convolutions from secondary sources, it enables advanced acoustic channel characterization.

Area of Science:

  • Acoustics
  • Signal Processing
  • Wave Propagation

Background:

  • Measuring the Green's function is crucial for understanding acoustic channels.
  • Traditional methods often require direct pulse emission between measurement points.
  • Existing techniques can be limited in complex acoustic environments.

Purpose of the Study:

  • To develop a new method for measuring the Green's function between two points in an acoustic channel.
  • To achieve this measurement without requiring pulse emission from the points of interest.
  • To explore the application of this method in discreet acoustic communications.

Main Methods:

  • Utilizing a set of secondary sources within the acoustic channel.
  • Averaging the correlation or convolution of signals received at the two points (A and B).

Related Experiment Videos

  • Developing a theoretical framework based on mode propagation in a monochromatic regime, extended to the time domain.

    • Main Results:

    • Successfully estimated the Green's function using the proposed secondary source averaging technique.
    • Validated the method through numerical simulations in both range-independent and range-dependent acoustic environments.
    • Demonstrated the theoretical approach in both monochromatic and time-domain analyses.

    Conclusions:

    • The developed method offers a viable alternative for Green's function measurement in acoustic channels.
    • This technique bypasses the need for direct pulse transmission, simplifying measurements.
    • The approach shows potential for enhancing discreet acoustic communication systems.