真实场景下机载脉冲压缩雷达地杂波模拟  

The Ground Clutter Simulation of Airborne Pulse Compression Radar in Real Scenes

作　　者：李正玉[1] 潘明海[1] 贲德[1] 

机构地区：[1]南京航空航天大学电子信息工程学院,江苏南京210016

出　　处：《雷达科学与技术》2013年第3期320-324,328,共6页Radar Science and Technology

基　　金：江苏高校优势学科建设工程资助项目;国家自然科学基金(No.61071164);南京航空航天大学研究生科创基金项目(No.kfjj120114)

摘　　要：真实场景下的地杂波模拟是雷达系统射频仿真的重要内容,文章假设机载脉冲压缩雷达的地面背景为平坦的中等干度裸地,深入研究了真实场景下宽带雷达地杂波的实时性重构算法。文章第一部分利用小微扰法和Weibull分布模型研究了背景的后向散射特性;第二部分利用子带分割原理计算了归一化的宽带地杂波功率谱;第三部分首先在不考虑多普勒效应的情况下通过推导证明无多普勒频移的宽带地杂波功率谱等于归一化的宽带地杂波功率谱与发射信号功率谱的乘积;第四部分提出了一种包括多普勒调制算法在内的基于杂波频域特征的宽带地杂波模拟算法,并且给出了仿真结果,证明了算法的有效性。The simulation of ground clutter in real scenes is an important part of radar system RF simu lation. In this paper, assume that the background of airborne pulse compression radar is flat middle dryness bare land and research on real-time reconstruction of wideband radar ground clutter is made. First of all, using the small perturbation approximation and Weibull distribution, the background backscatter characteris- tics is studied deeply. After that, the normalized broadband ground clutter spectrum is calculated using sub band splitting model. Thirdly, without considering the Doppler effect, this paper proves that the broadband ground clutter power spectrum is equal to the product of the normalized broadband ground clutter spectrum and the transmitted signal power spectrum. Finally, in order to get the true broadband ground clutter power spectrum, Doppler frequency modulation is necessary. Based on the clutter frequency domain characteristics, the paper proposes a new broadband ground clutter simulation method and the simulation results are given. These results prove the correctness of the algorithm.

关 键 词：背景 后向散射 脉冲压缩雷达 杂波模拟 

分 类 号：TN955.3[电子电信—信号与信息处理]