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Array directivity enhancement by leveraging angle-dependent scattering.

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This study explores wave scattering in sonar arrays to enhance localization directivity without increasing array size. A novel scattering relationship improves directivity, verified by beamform plots and index calculations.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Sonar array directivity, crucial for localization, is fundamentally limited by physical aperture size.
  • Prior methods to enhance directivity without increasing array dimensions yielded limited success.
  • Non-traditional arrays utilizing wave scattering offer potential for improved performance.

Purpose of the Study:

  • To investigate the enhancement of sonar array directivity through controlled wave scattering.
  • To modify existing localization and directivity models to incorporate scattered wave effects.
  • To propose and validate a new scattering relationship for improved array performance.

Main Methods:

  • Modification of established localization and directivity equations to account for wave scattering.
  • Theoretical analysis to explain limitations of previous scattering-based approaches.
  • Experimental verification using beamform plot comparisons and directivity index calculations.

Main Results:

  • Established why prior scattering techniques failed to improve directivity.
  • Proposed a novel scattering relationship demonstrating significant directivity enhancement.
  • Validated the proposed method through quantitative analysis and comparative plots.

Conclusions:

  • Wave scattering within non-homogeneous sonar arrays can significantly improve localization directivity.
  • The proposed scattering relationship offers a viable method to enhance array performance without physical size increase.
  • This research provides a validated approach for advancing sonar array capabilities.