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Narrowband localization in the deep sea is effective for stationary sound sources, especially when broadband methods fail. This study analyzes interference patterns to improve localization accuracy using vertical arrays.

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Area of Science:

  • Ocean acoustics
  • Signal processing
  • Underwater acoustics

Background:

  • Line spectra in deep-sea radiated noise offer higher signal-to-noise ratios than broadband components.
  • Narrowband localization serves as a crucial complement to broadband methods, particularly when the latter are less effective.

Purpose of the Study:

  • To analyze the variation patterns of key interference depth intervals.
  • To develop and validate a localization method for narrowband stationary sound sources in the deep sea.

Main Methods:

  • Utilized a near-bottom vertical array in the deep-sea direct-arrival zone.
  • Analyzed depth-dependent interference structures based on receiver depth, source range, and source depth.
  • Verified the proposed localization method using simulation and experimental data.

Main Results:

  • Identified distinct depth-dependent interference structures in the deep-sea direct-arrival zone.
  • Characterized the variation patterns of interference depth intervals with key environmental and source parameters.
  • Demonstrated the effectiveness of the proposed narrowband localization method.

Conclusions:

  • The proposed localization method is effective for narrowband stationary sound sources in the deep sea.
  • Understanding interference structure variations is key to improving underwater acoustic localization.
  • Narrowband techniques provide a valuable alternative for acoustic localization in challenging deep-sea environments.