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A simple method for moving source depth estimation applied to the SWellEx96 data.

Jianguo Zhang1, T C Yang1, Guangying Zheng2

  • 1College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310058, China.

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This study shows that acoustic beam patterns can estimate underwater source depth independently of range. A new incoherent matched beam processing method successfully determined source depth using specific acoustic frequencies.

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Area of Science:

  • Ocean acoustics
  • Underwater acoustics
  • Signal processing

Background:

  • Traditional source localization in ocean waveguides couples range and depth estimation.
  • Acoustic field properties intrinsically link source range and depth.
  • Existing methods face challenges due to this coupling.

Purpose of the Study:

  • To develop a method for independent source depth estimation in ocean waveguides.
  • To demonstrate that vertical beam distribution is sensitive to source depth, not range.
  • To apply an incoherent matched beam processing technique to real-world data.

Main Methods:

  • Averaging beam intensities over ranges exceeding mode cycle distances.
  • Analyzing the range-averaged vertical beam distribution.
  • Implementing an incoherent matched beam processing method.
  • Utilizing SWellEx96 moving source data at 127 and 130 Hz.

Main Results:

  • Range-averaged vertical beam distribution is insensitive to source range.
  • Range-averaged vertical beam distribution is sensitive to source depth.
  • The incoherent matched beam processing method accurately estimated source depth.
  • Successful application to SWellEx96 data at specific frequencies.

Conclusions:

  • Independent source depth estimation is achievable in ocean waveguides.
  • The proposed method offers a viable alternative to coupled range-depth localization.
  • Acoustic beam analysis provides robust depth information.