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Summary
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This study introduces incoherent matched beam processing for estimating target depth using acoustic data. The method improves depth resolution, especially for shallow sources, complementing existing techniques.

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Area of Science:

  • Ocean acoustics
  • Underwater target detection
  • Signal processing

Background:

  • Vertical line arrays in deep water offer lower ambient noise for target detection.
  • Previous methods used Fourier transforms for narrowband signals to differentiate sources based on depth-related harmonic features.

Purpose of the Study:

  • To develop and evaluate a new method for estimating underwater target depth.
  • To improve depth resolution and shallow source depth estimation.
  • To extend target depth estimation to broadband signals and complex environments.

Main Methods:

  • Incoherent matched beam processing is employed to estimate target depth.
  • Source depth is determined by matching replica beam intensity/amplitude time series with data.
  • Simulated data is used for method evaluation.

Main Results:

  • The incoherent matched beam processing method provides enhanced depth resolution.
  • The method demonstrates improved ability to estimate the depth of very shallow sources (e.g., 10 m).
  • The technique complements existing Fourier transform-based methods.

Conclusions:

  • Incoherent matched beam processing is an effective method for underwater target depth estimation.
  • This approach offers advantages in resolution and shallow source localization.
  • The method is adaptable for broadband signals and environments where Lloyd's mirror theory is not applicable.