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Deconvolved frequency-difference beamforming for a linear array.

Lei Xie1, Chao Sun2, Jiwei Tian1

  • 1College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, 266100, China.

The Journal of the Acoustical Society of America
|December 31, 2020
PubMed
Summary
This summary is machine-generated.

Frequency-difference beamforming (FDB) improves wave direction estimation but reduces spatial resolution. A new method, deconvolved FDB (Dv-FDB), enhances array performance by narrowing beams and lowering sidelobes while maintaining robustness.

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Area of Science:

  • Signal Processing
  • Array Signal Processing
  • Wave Propagation Analysis

Background:

  • Frequency-difference beamforming (FDB) offers robust wave propagation direction estimation.
  • FDB shifts signal processing to lower frequencies, which inherently decreases spatial resolution.

Purpose of the Study:

  • To address the spatial resolution limitations of FDB.
  • To introduce a novel beamforming technique for improved array performance.

Main Methods:

  • The beam pattern of FDB for a distant point source was analyzed and proven to be shift invariant.
  • This shift-invariant pattern was utilized as the point spread function for deconvolution.
  • Deconvolved frequency-difference beamforming (Dv-FDB) was developed by applying deconvolution to FDB.

Main Results:

  • Dv-FDB was demonstrated to yield a narrower beam compared to traditional FDB.
  • Lower sidelobe levels were achieved with Dv-FDB.
  • The robustness of FDB in wave direction estimation was successfully maintained by Dv-FDB.

Conclusions:

  • Dv-FDB significantly enhances array performance in wave direction estimation.
  • The proposed method offers a superior trade-off between robustness and spatial resolution.
  • Simulations and experimental data validated the effectiveness of Dv-FDB.