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Iterative range estimation in a sloping-bottom shallow-water waveguide using the generalized array invariant.

Chomgun Cho1, H C Song1, P Hursky2

  • 1Scripps Institution of Oceanography, La Jolla, California 92093-0238, USA.

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|August 3, 2017
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Summary
This summary is machine-generated.

This study extends array invariant theory for acoustic source localization in variable environments. An iterative method accurately estimates source range in sloping-bottom shallow waters.

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Area of Science:

  • Ocean acoustics
  • Underwater acoustics
  • Wave propagation

Background:

  • The generalized array invariant incorporates the waveguide invariant (β) for acoustic analysis.
  • Extending this to range-dependent environments requires accounting for a variable waveguide invariant.

Purpose of the Study:

  • To extend the generalized array invariant to mildly range-dependent environments with sloping bottoms.
  • To develop an iterative method for acoustic source range estimation in such environments.

Main Methods:

  • The generalized array invariant was adapted for environments with a range-variable waveguide invariant (β).
  • An iterative approach was developed, updating β at each estimated range, starting with a range-independent assumption (β=1).
  • The method was tested using data from the Random Array of Drifting Acoustic Receivers 2007 experiment.

Main Results:

  • The iterative array invariant approach demonstrated convergence toward the correct source range.
  • Successful source range estimation was achieved in a sloping-bottom shallow-water waveguide.
  • The experiment involved a high-frequency source towed in a dynamic environment.

Conclusions:

  • The generalized array invariant can be effectively applied iteratively for source localization in range-dependent environments.
  • This method provides a viable approach for acoustic source range estimation in complex shallow-water scenarios.
  • The study validates the iterative array invariant technique in a realistic oceanographic setting.