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Area of Science:

  • Array Signal Processing
  • Acoustic and Optical Sensor Technology

Background:

  • High-order superdirectivity in circular sensor arrays is crucial for enhanced performance.
  • Existing analytical models require completion for robust application.

Purpose of the Study:

  • To complete and validate an analytical superdirectivity model for circular sensor arrays.
  • To investigate and achieve robust superdirectivity through novel approaches.

Main Methods:

  • Analysis of the limit expression for the maximum directivity factor.
  • Decomposition of the sensitivity function into closed-form sensitivity functions of eigenbeams.
  • Development and experimental validation of two robust superdirectivity approaches.

Main Results:

  • Circular arrays demonstrate significant potential for directivity improvement.
  • Eigenbeam performance serves as an effective indicator of error sensitivity.
  • Robustness constraint parameters are readily estimable.

Conclusions:

  • The study successfully extends the analytical superdirectivity model.
  • Proposed methods enable robust superdirectivity in circular sensor arrays.
  • Experimental validation confirms the effectiveness of the developed techniques.