Volume 11 Issue 5
Oct.  2022
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Article Navigation >  Journal of Radars  > 2022  >  11(5): 871-883
WANG Yuqi, SUN Guangcai, YANG Jun, et al. Passive localization algorithm for radiation source based on long synthetic aperture[J]. Journal of Radars, 2020, 9(1): 185–194. doi: 10.12000/JR19080
Citation: DUAN Keqing, LI Yufan, YANG Xingjia, et al. Reduced degrees of freedom in space-time adaptive processing for space-based early warning radar[J]. Journal of Radars, 2022, 11(5): 871–883. doi: 10.12000/JR22075
shu

Reduced Degrees of Freedom in Space-Time Adaptive Processing for Space-based Early Warning Radar

DOI: 10.12000/JR22075 CSTR: 32380.14.JR22075
  • 1.

    School of Electronic and Communication Engineering, Sun Yat-sen University, Shenzhen 518107, China

  • 2.

    Air Force Early Warning Academy, Wuhan 430019, China

Funds:  The National Natural Science Foundation of China (61871397)
More Information
  • Corresponding author: WANG Yongliang, ylwangkjld@163.com
  • Received Date: 2022-04-26
  • Rev Recd Date: 2022-06-08
    • Available Online: 2022-06-15
  • Publish Date: 2022-07-13
    Abstract
  • The clutter of space-based early warning radar exhibits tight coupling in the azimuth-elevation-Doppler domain due to the high speed of satellites and the Earth’s rotation. As a result, conventional Space-Time Adaptive Processing (STAP) suffers significant performance degradation when detecting slow moving targets. The azimuth-elevation-Doppler three-dimensional STAP method provides the ability to decouple clutter and thus can achieve sub-optimal performance for clutter suppression. However, in contrast to the situation in non-sidelooking airborne early warning radar, this method requires large system degrees of freedom when applied to space-based early warning radar. Therefore, in practice, both the computational load and the sample requirement are too large to meet. In this study, the space-time signal model of the planar array for space-based early warning radar is first constructed. Then, the tight coupling characteristic of clutter in the azimuth-elevation-Doppler domain is analyzed in detail. On this basis, a novel three-dimensional STAP method with reduced degrees of freedom with factored structure is proposed. The sidelobe clutter is first suppressed via amplitude taper in azimuth, and the mainlobe clutter responding to each ambiguous range is further canceled by adaptive processing in the elevation-Doppler domain. The simulation results show that the proposed method can achieve sub-optimal performance under low computational load and limited sample conditions. Therefore, the proposed method is suitable for practical application in space-based early warning radar.

     

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