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天基监视雷达的距离游走补偿研究

王海涛1，朱根才1，贲德1，潘明海1，常建平1，汪立森2   

  1. 1，南京航空航天大学 信息科学与技术学院，江苏 南京 210016；

    2，扬州船舶重工集团公司723所,江苏 扬州 225001

  • 收稿日期:2006-09-01 修回日期:2007-03-16 出版日期:2007-07-30 发布日期:2007-07-30

Compensation of Range Walking of Space-Based Surveillance Radar

WANG Hai-tao1, ZHU Gen-cai1, BEN De1, PAN Ming-hai1, CHANG Jian-ping1, WANG Li-sen2   

  1. 1. College of Information Science and Technology, Nanjing University of Aeronautics &Astronautics, Nanjing, 210016, China;

    2. No. 723 Research Institute, China Shipbuilding Industry Corporation, Yangzhou 225003, China

  • Received:2006-09-01 Revised:2007-03-16 Online:2007-07-30 Published:2007-07-30

摘要： 为了实现天基雷达杂波消除、高分辨率的角度估计和广域监视功能，采用三通道相位中心偏置天线（DPCA）/monopulse（单脉冲）信号处理系统。由于天基雷达的运动和地球自转，使得地球上每一点的杂波都产生了附加的多普勒成分——距离游走效应。文中从天基雷达-地球几何关系的角度分析距离游走效应。距离游走与距离重叠效应相结合，明显降低了DPCA处理算法的杂波抑制性能。针对距离游走效应在相干处理阶段进行反向补偿、在非相干积累阶段采用线性内插的方法进行校正，针对距离重叠效应，采用波形分集技术进行校正。

关键词: 天基雷达, 相位中心偏置天线, 距离游走, 波形分集

Abstract: To derive clutter cancellation, high-resolution angle estimation and wide-area surveillance, space-based radar (SBR) uses a signal processing system of 3-channel DPCA/monopulse. The radar's motion and earth rotation generate a Doppler frequency component in the clutter return form any point on the earth — range walking. We discuss range walking based on the SBR-earth geometry, and show that range walking together with range foldover significantly degrade the clutter suppression performance of the DPCA algorithms. Effects of range walking are eliminated with appropriate inverse compensation during coherent processing interval, and with linear interpolations during non-coherent interval. Effect of range foldover is eliminated using waveform diversity.

Key words: SBR, displaced phase center antenna (DPCA), range walk, waveform diversity