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Maximum Constrained Directivity of Oversteered End-Fire Sensor Arrays.

Andrea Trucco1,2, Federico Traverso3, Marco Crocco4

  • 1Department of Electrical, Electronic, Telecommunications Engineering, and Naval Architecture (DITEN), University of Genoa, 5-16126 Genova, Italy. andrea.trucco@unige.it.

Sensors (Basel, Switzerland)
|June 13, 2015
PubMed
Summary

Optimized oversteering simplifies end-fire beamformer design for linear arrays. This method achieves directivity close to optimal end-fire performance with simpler processing, enhancing robustness against array errors.

Keywords:
beamformingend-fire arraysmaximum directivitymicrophone and hydrophone arraysoversteeringwhite noise gain

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Area of Science:

  • Array Signal Processing
  • Electromagnetics and Acoustics

Background:

  • End-fire steering in linear arrays offers superior directivity over broadside steering for sub-wavelength spacing.
  • Achieving optimal end-fire performance typically requires complex processing with complex weights, unlike simpler broadside architectures.

Purpose of the Study:

  • To investigate the oversteering technique for simplifying the processing architecture of equally spaced end-fire arrays.
  • To develop a method for computing optimal oversteering parameters to maximize directivity.

Main Methods:

  • Proposing a method to calculate the oversteering amount and real-valued weight vector.
  • Utilizing numerical simulations for statistical analysis of performance and robustness.

Main Results:

  • The maximized oversteering performance closely approximates the optimum end-fire performance.
  • The proposed method yields an optimized oversteering performance comparable to end-fire arrays but with similar implementation complexity to broadside arrays.
  • Statistical analysis confirms the robustness of maximized oversteering against sensor mismatches.

Conclusions:

  • Optimized oversteering is a practical approach for designing end-fire arrays.
  • This technique offers enhanced directivity over broadside arrays with comparable implementation complexity.
  • The method provides a robust solution for beamformer design in the presence of array imperfections.