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Superdirective beamforming achieves high directivity with smaller arrays compared to conventional beamforming (CBF). This technique significantly improves low-frequency signal reception, especially for size-limited applications like miniature microphones.

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Area of Science:

  • Acoustics and Signal Processing
  • Array Signal Processing
  • Underwater Acoustics

Background:

  • Conventional beamforming (CBF) requires large apertures for high directivity.
  • Superdirective beamforming offers enhanced directivity with reduced array size.
  • Limited aperture arrays are crucial for applications like miniature microphones and underwater acoustics.

Purpose of the Study:

  • To investigate the effectiveness of superdirective beamforming in improving directivity and array gain.
  • To demonstrate the application of deconvolving CBF for superdirective beamforming.
  • To analyze performance using real-world data from the SWellEx96 horizontal array.

Main Methods:

  • Implementing superdirective beamforming through deconvolving conventional beamforming (CBF).
  • Utilizing sub-arrays of the SWellEx96 horizontal array data for analysis.
  • Evaluating directivity (beam width) and array gain improvements.

Main Results:

  • Superdirective beamforming achieved comparable directivity to larger conventional arrays with a smaller aperture.
  • Significant improvements in directivity and array gain were observed.
  • The method proved effective even when using only sub-arrays of the available data.

Conclusions:

  • Superdirective beamforming is a viable technique for enhancing array performance in size-constrained scenarios.
  • Deconvolving CBF provides a practical method for achieving superdirectivity.
  • The findings are applicable to low-frequency signal reception in miniature and underwater acoustic arrays.