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A DOA Estimation Method for Multi-beam Sonar Imaging Based on Improved Iterative Adaptive Aproach Using FrFT
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Liubing JIANG1, 2, Haixin YANG1, Li CHE1, 2, Qianchao HUANG1
Telecommunication Engineering | 2025, 65(11) : 1921 - 1928
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Telecommunication Engineering | 2025, 65(11): 1921-1928
• Electronics and Information Engineering •
A DOA Estimation Method for Multi-beam Sonar Imaging Based on Improved Iterative Adaptive Aproach Using FrFT
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Liubing JIANG1, 2, Haixin YANG1, Li CHE1, 2, Qianchao HUANG1
Affiliations
  • 1School of Information and Communication，Guilin University of Electronic Science and Technology，Guilin 541004，China
  • 2Key Laboratory of Wireless Broadband Communication and Signal Processing in Guangxi，Guilin University of Electronic Science and Technology，Guilin 541004，China
Published: 2025-11-28 doi: 10.20079/j.issn.1001-893x.240506003
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For the problem of target azimuth estimation under low signal-to-noise ratio (SNR) for active sonar in underwater environments,a direction of arrival(DOA) estimation multi-beamforming sonar imaging method based on fractional Fourier transform (FrFT )-enhanced iterative adaptive approach (IAA ) is proposed. Firstly, the echo signals received by hydrophones are subjected to FrFT preprocessing, transforming the wideband linear frequency modulation (LFM ) signals into narrowband signals in the fractional domain to avoid the influence of cross-interference terms. Then, focusing on LFM signals and suppressing noise in the FrFT domain is achieved. Finally,the iterative adaptive method is implemented in the FrFT domain,optimizing the power spectrum estimation method for accurate DOA estimation. Compared with traditional DOA estimation methods, the proposed method achieves better estimation accuracy and smaller root mean square error under low SNR conditions without increasing sensor array elements. It significantly improves imaging effectiveness, as indicated by simulation results showing sidelobe levels-13.364 dB for peak sidelobe ratio. in the range direction and -9.723 dB for integrated sidelobe ratio,-13.874 dB for peak sidelobe ratio in the azimuth direction and -10.034 dB for integrated sidelobe ratio.

active sonar imaging  /  underwater DOA estimation  /  fractional Fourier transform  /  iterative adaptive approach
Liubing JIANG, Haixin YANG, Li CHE, Qianchao HUANG. A DOA Estimation Method for Multi-beam Sonar Imaging Based on Improved Iterative Adaptive Aproach Using FrFT[J]. Telecommunication Engineering, 2025 , 65 (11) : 1921 -1928 . DOI: 10.20079/j.issn.1001-893x.240506003
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Year 2025 volume 65 Issue 11
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Article Info
doi: 10.20079/j.issn.1001-893x.240506003
  • Receive Date：2024-05-06
  • Online Date：2026-04-15
  • Published：2025-11-28
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  • Received：2024-05-06
  • Revised：2024-07-18
Affiliations
    1School of Information and Communication，Guilin University of Electronic Science and Technology，Guilin 541004，China
    2Key Laboratory of Wireless Broadband Communication and Signal Processing in Guangxi，Guilin University of Electronic Science and Technology，Guilin 541004，China
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