宽带运动目标回波的多普勒特性模拟方法  

Simulation Method of Doppler Characteristics of Broadband Moving Target Echoes

作　　者：何纬婧 潘明海[1] HE Weijing;PAN Minghai(Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China)

机构地区：[1]南京航空航天大学,江苏南京211106

出　　处：《雷达科学与技术》2021年第4期403-408,416,共7页Radar Science and Technology

摘　　要：宽带雷达系统测试和性能评估中目标信息模拟精度和分辨率要求很高。针对宽带线性调频雷达运动目标的回波脉冲内多普勒频率呈现线性调频(LFM)变化特征、回波脉冲之间具有时移分布和相位相干特性的问题,采用基于数字射频存储(DRFM)系统的回波脉冲内LFM多普勒频率调制、多回波相参脉冲信号之间时移模拟的方法。探讨了基于宽带DRFM系统的高精度和高分辨率的运动目标多普勒频率信息实时模拟方法。采用仿真分析和实验验证方法,证实算法性能,运动目标的多普勒频率模拟精度/分辨率在特定条件下可达到Hz级。The test and performance evaluation of wideband radar system require high target information simulation accuracy and resolution.For the broadband chip radar moving targets,the Doppler frequency within the echo pulse shows linear frequency modulation(LFM)characteristics,and the echo pulse has time-shift distribution and phase coherence characteristics.The method modulation of LFM Doppler frequency in the echo pulse and the simulation method of the time shift between the multi-echo coherent pulse signals based on the digital radio frequency memory(DRFM)system are used.The real-time simulation method of high-precision and high-re-solution moving target Doppler frequency information based on broadband DRFM system is discussed.Simulation analysis and experimental verification methods are adopted to verify the performance of the algorithm.The Doppler frequency simulation accuracy/resolution of the moving target can reach Hz level under certain conditions.

关 键 词：宽带雷达回波重构 实时计算 脉内多普勒频率特性 脉间时移分布 高精度 

分 类 号：TN955.2[电子电信—信号与信息处理]