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Implementation of continuously steerable beam patterns for a uniform circular projector array.

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  • 1State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

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|October 1, 2022
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A new method enables continuously steerable super-cardioid beam patterns (SCBP) using fewer components for underwater acoustic projector arrays. This innovation reduces cost and space while maintaining flexibility for low-frequency emissions.

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Area of Science:

  • Underwater acoustics
  • Array signal processing
  • Transducer technology

Background:

  • Continuously steerable super-cardioid beam patterns (SCBP) offer advantages like directional control, narrow beam width, and high gain.
  • Uniform circular arrays (UCA) are typically used for SCBP implementation.

Purpose of the Study:

  • To propose and analyze an improved implementation method for continuously steerable SCBPs specifically for projector arrays.
  • To reduce the number of array elements and power amplifiers required compared to common methods.

Main Methods:

  • Synthesis and analysis of SCBP based on a uniform circular array (UCA) model with omnidirectional sources.
  • Implementation using a uniform circular projector array (UCPA) with single-sided radiation flextensional transducers.
  • Finite element method (FEM) analysis to verify suitability for underwater acoustic projector arrays.

Main Results:

  • The proposed method requires fewer array elements and power amplifiers, reducing cost and installation space.
  • FEM analysis confirmed the method's suitability for underwater acoustic projector arrays.
  • Fabricated UCPA prototypes and subsequent tests demonstrated flexibility in low-frequency emission applications.

Conclusions:

  • The developed method provides a cost-effective and space-efficient approach for implementing continuously steerable SCBPs.
  • The system is well-suited for underwater acoustic projector arrays, particularly for low-frequency applications.
  • The proposed implementation offers a flexible solution for steerable acoustic beamforming.