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Multi-receiver wide-beam SAS chirp scaling imaging algorithm based on complex dual square-root series inversion.

Yunxin Tan1,2,3, Guangju Li4,5, Weiming Gan6

  • 1Hainan Acoustics Laboratory, Institute of Acoustics, Chinese Academy of Sciences, 570105, Haikou, China. tanyx33@mail3.sysu.edu.cn.

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Summary
This summary is machine-generated.

This study introduces a new synthetic aperture sonar (SAS) imaging algorithm that overcomes limitations in wide-beam conditions. The novel approach achieves high-precision, well-focused images, expanding SAS applicability.

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Area of Science:

  • Marine acoustics
  • Sonar imaging technology
  • Signal processing

Background:

  • Conventional synthetic aperture sonar (SAS) algorithms perform poorly in wide-beam scenarios.
  • This limitation hinders the advancement of SAS imaging technology.
  • Accurate imaging requires precise derivation of the two-dimensional (2D) spectrum, which is complicated by the dual-square-root (DSR) structure and wide-beam approximations.

Purpose of the Study:

  • To develop a high-precision SAS imaging algorithm for wide-beam conditions.
  • To overcome the imaging performance degradation associated with wide-beam scenarios.
  • To enhance the applicability and effectiveness of SAS imaging technology.

Main Methods:

  • Developed a novel algorithm based on series reversion of the dual-square-root (DSR) form.
  • Preserved accurate time-domain information and the DSR structure.
  • Applied Taylor series expansion and series reversion to derive a closed-form expression of the 2D spectrum.
  • Derived a frequency-domain expansion in terms of azimuth and range frequencies.
  • Performed matched filtering in azimuth and range directions.

Main Results:

  • Achieved well-focused, high-resolution SAS simulation images.
  • Demonstrated favorable focusing performance through water-tank experiments.
  • Successfully extended the applicability of SAS imaging to wide-beam conditions.

Conclusions:

  • The proposed high-precision imaging algorithm effectively addresses the challenges of wide-beam SAS imaging.
  • The method provides accurate focusing and high resolution, validated by simulations and experiments.
  • This advancement significantly broadens the operational capabilities of SAS technology.