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LU Qing, ZOU Zihao, HUANG Penghui, et al. Clutter suppression performance analysis of spaceborne bistatic radar systems based on a semiempirical bistatic clutter scattering coefficient model[J]. Journal of Radars, in press. doi: 10.12000/JR25059
Citation: LU Qing, ZOU Zihao, HUANG Penghui, et al. Clutter suppression performance analysis of spaceborne bistatic radar systems based on a semiempirical bistatic clutter scattering coefficient model[J]. Journal of Radars, in press. doi: 10.12000/JR25059
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Clutter Suppression Performance Analysis of Spaceborne Bistatic Radar Systems Based on a Semiempirical Bistatic Clutter Scattering Coefficient Model

DOI: 10.12000/JR25059 CSTR: 32380.14.JR25059
  • 1.

    School of Electronics and Information, Northwestern Polytechnical University, Xi’an 710072, China

  • 2.

    School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

  • 3.

    Shanghai Academy of Spaceflight Technology, Shanghai 201109, China

  • 4.

    Shanghai Institute of Satellite Engineering, Shanghai 201109, China

Funds:  The National Natural Science Foundation of China (62271406)
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    Abstract
  • Conventional spaceborne monostatic radar systems incur huge engineering costs to achieve small moving-target detection and low anti-interference ability. By manipulating the transmitter-receiver separation in a spaceborne bistatic radar system, the target radar cross section can be effectively improved by adopting a configuration with a large azimuth bistatic angle, and the anti-interference ability can be improved because the receiver does not transmit signals. However, the characteristics of the background clutter echo in a spaceborne bistatic radar system differ drastically from those in a spaceborne monostatic radar system because of the transmitter-receiver separation in the former. To overcome the limitations of existing empirical clutter scattering coefficient models, which typically do not capture the variation of scattering coefficient with azimuth bistatic angle, this study proposes a semiempirical bistatic clutter scattering coefficient model based on the two-scale model. In the proposed model, an empirical clutter backscattering coefficient model can be converted to a bistatic clutter scattering coefficient model based on electromagnetic scattering theories, and the bistatic scattering coefficient is further modified based on the two-scale model. The proposed model was validated using real measured data of bistatic clutter scattering coefficients obtained from existing literature. Using the proposed model, clutter suppression performance under different azimuth bistatic angles was analyzed by employing space-time adaptive processing in spaceborne bistatic radar systems. Reportedly, under HH polarization, the clutter suppression performance was relatively good when the azimuth bistatic angle was 30°～130°, whereas the clutter suppression performance was considerably affected by large-power main-lobe clutter when the azimuth bistatic angle was >150°.

     

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