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Extracting Green's functions between ships of opportunity using a vertical array.

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Researchers extracted the acoustic Green's function between two ships using a limited vertical receiver array. This novel method utilizes blind deconvolution and correlation/convolution for underwater acoustic communication.

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Area of Science:

  • Acoustics
  • Oceanography
  • Signal Processing

Background:

  • Estimating Green's functions in acoustic waveguides is crucial for underwater acoustics.
  • Previous methods required vertical source arrays spanning the full waveguide depth.

Purpose of the Study:

  • To develop a method for extracting the Green's function between two ships using a limited aperture vertical receiver array.
  • To demonstrate the feasibility of this method with real-world ocean noise data.

Main Methods:

  • Reversing the roles of sources and receivers in acoustic propagation.
  • Estimating individual Green's functions via blind deconvolution.
  • Combining individual Green's functions using correlation or convolution.

Main Results:

  • Successfully extracted the Green's function between two ships using a limited aperture array.
  • Demonstrated feasibility with broadband noise (100-500 Hz) from ships of opportunity.
  • Validated the method in shallow water (approx. 100m depth).

Conclusions:

  • The proposed method effectively estimates inter-ship Green's functions using limited vertical arrays.
  • This technique offers a practical approach for underwater acoustic channel characterization.