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A frequency-invariant beamforming method for a logarithmically arranged biconical vector hydrophone array.

Chenyang Gui1,2,3, Zhonghao Huo1,2, Weijia Wang1,2

  • 1National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China.

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Summary
This summary is machine-generated.

This study introduces a new biconical array and constant beam width beamforming (CBB) method to improve ship noise measurement. The novel approach enhances array gain and reduces errors for underwater acoustic applications.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Biconical arrays in ship noise measurement systems suffer from low element utilization.
  • Traditional beamforming methods often lack frequency invariance and efficient element usage.

Purpose of the Study:

  • To propose a logarithmically distributed biconical array and a constant beam width beamforming (CBB) method.
  • To enhance element utilization and achieve frequency-invariant beamforming for ship noise measurement systems.

Main Methods:

  • Calculating optimal element positions using continuous array beam pattern equations.
  • Deriving a compensation function for frequency-invariant beam patterns from modal-domain equations.
  • Converting the compensation function into a filter for CBB.

Main Results:

  • Achieved at least 6 dB additional array gain compared to traditional nested arrays.
  • Reduced broadband processing errors by over 45% compared to the nested method.
  • Demonstrated applicability to vector arrays, outperforming scalar arrays.

Conclusions:

  • The proposed logarithmically distributed biconical array and CBB method significantly improve performance in ship noise measurement.
  • The method offers flexible beam pattern design and enhanced performance for broadband array signal processing.
  • Suitable for diverse underwater acoustic applications including radiated noise measurement and target identification.