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Frequency Invariant Beamforming for a Small-Sized Bi-Cone Acoustic Vector-Sensor Array.

Erzheng Fang1,2,3, Chenyang Gui2, Desen Yang1,2,3

  • 1Acoustic Science and Technology Laboratory, Harbin Engineering University, Harbin 150001, China.

Sensors (Basel, Switzerland)
|January 30, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel frequency invariant beamforming method for small-sized bi-cone acoustic vector-sensor arrays (BCAVSAs). The method, inspired by insect hearing, enhances underwater acoustic signal processing with narrower mainlobe width and lower sidelobes.

Keywords:
bi-cone acoustic vector-sensor array (BCAVSA)frequency invariant beamformingnested cylindrical acoustic vector-sensor arraythe mechanical coupling of Ormia ochracea’s two ears

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Area of Science:

  • Acoustics
  • Signal Processing
  • Bio-inspired Engineering

Background:

  • Acoustic vector-sensor arrays (AVSAs) are crucial for directional sound detection.
  • Traditional beamforming methods struggle with frequency-dependent performance.
  • The hearing mechanism of *Ormia ochracea* offers a model for enhanced acoustic sensing.

Purpose of the Study:

  • To design a compact bi-cone acoustic vector-sensor array (BCAVSA).
  • To develop a frequency invariant beamforming method for the BCAVSA.
  • To improve underwater acoustic signal detection performance.

Main Methods:

  • Designed a BCAVSA using cylindrical acoustic vector-sensor arrays (AVSAs).
  • Modeled the *Ormia ochracea*'s coupling ear system to achieve virtual element spacing.
  • Derived frequency-weighted coefficients for a constant beamwidth beamformer.

Main Results:

  • The proposed frequency invariant beamforming method achieved a narrower mainlobe width compared to the original BCAVSA.
  • The method demonstrated lower sidelobes than the original BCAVSA.
  • Performance was superior to coupling magnified bi-cone pressure sensor arrays.

Conclusions:

  • The developed frequency invariant beamforming method enhances BCAVSA performance.
  • Bio-inspired coupling mechanisms can be effectively applied to acoustic array design.
  • This approach offers improved underwater acoustic signal processing capabilities.