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Robust source-range estimation using the array/waveguide invariant and a vertical array.

Chomgun Cho1, H C Song1, W S Hodgkiss1

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Summary
This summary is machine-generated.

This study applies the unified array/waveguide invariant method for accurate source-range estimation using a vertical array (VA) in fluctuating ocean conditions. The robust approach achieved less than 8% error in shallow water, proving its effectiveness.

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Area of Science:

  • Ocean acoustics
  • Underwater acoustics
  • Signal processing

Background:

  • The array invariant method aids source-range estimation without forward modeling.
  • This method is a specific case of waveguide invariant theory.
  • Previous studies validated the array invariant with horizontal arrays in shallow water.

Purpose of the Study:

  • To apply the unified array/waveguide invariant approach for source-range estimation.
  • To assess the method's performance using a short-aperture vertical array (VA).
  • To evaluate the approach in a fluctuating ocean environment over a one-day period.

Main Methods:

  • Utilized a 12-m long vertical array (VA) in approximately 100m deep water.
  • Employed the unified array/waveguide invariant approach for source-range estimation.
  • Collected experimental data over a one-day period in a fluctuating ocean environment.

Main Results:

  • Achieved mean range estimates with less than 8% relative error.
  • Successfully estimated the range of a 2-3 kHz source located 6 km away.
  • Demonstrated the robustness of the unified array/waveguide invariant approach.

Conclusions:

  • The unified array/waveguide invariant approach is robust for source-range estimation.
  • This method is effective even with short-aperture vertical arrays in dynamic ocean conditions.
  • The approach offers a reliable tool for underwater acoustic applications.