Volume 13 Issue 5
Sep.  2024
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Article Navigation >  Journal of Radars  > 2024  >  13(5): 1061-1072
WAN Fuhai, XU Jingwei, LIAO Guisheng, et al. Space-time two-dimensional clutter suppression method based on subarray beam pattern design[J]. Journal of Radars, 2024, 13(5): 1061–1072. doi: 10.12000/JR24064
Citation: WAN Fuhai, XU Jingwei, LIAO Guisheng, et al. Space-time two-dimensional clutter suppression method based on subarray beam pattern design[J]. Journal of Radars, 2024, 13(5): 1061–1072. doi: 10.12000/JR24064
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Space-time Two-dimensional Clutter Suppression Method Based on Subarray Beam Pattern Design

DOI: 10.12000/JR24064 CSTR: 32380.14.JR24064
  • 1.

    National Key Laboratory of Radar Signal Processing, Xidian University, Xi’an 710071, China

  • 2.

    China Academy of Space Technology (Xi’an), Xi’an 710000, China

Funds:  The National Natural Science Foundation of China (61931016, 62071344), Natural Science Basic Research Project of Shaanxi Province (2023-JC-JQ-55)
More Information
  • Corresponding author: XU Jingwei, xujingwei1987@163.com
  • Received Date: 2024-04-11
  • Rev Recd Date: 2024-05-09
    • Available Online: 2024-05-20
  • Publish Date: 2024-06-12
    Abstract
  • Airborne radar receivers that utilize subarray processing face challenges owing to the complex space-time coupling distribution caused by grating-lobe clutter. This results in multiple performance notches in the main beam, which severely affects target detection performance. To address this issue, we analyze the characteristics of grating-lobe clutter distribution in subarray processing and propose an approach for space-time clutter suppression based on the design of a receiving subarray beam pattern. Our approach leverages an overlapping subarray scheme to form wide nulls in the regions between subarrays where grating-lobe clutter is prevalent through beam pattern design. This design facilitates grating-lobe clutter pre-filtering between subarrays. Furthermore, we develop a subarray-level space-time processor that avoids the grating-lobe clutter coupling diffusion in the space-time two-dimensional plane by performing clutter pre-filtering within each subarray. This strategy enhances clutter suppression and moving-target-detection capabilities. Simulation results verify that the proposed method can remarkably improve the output signal to clutter plus noise ratio loss performance in grating-lobe clutter regions.

     

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