采样定时偏差对无源雷达性能影响研究  

Impact of Sampling Timing Offset on Passive Radar Performance

作　　者：饶云华[1] 徐凯文 王胜涛 万显荣[1] 龚子平[1] RAO Yunhua;XU Kaiwen;WANG Shengtao;WAN Xianrong;GONG Ziping(School of Electronic Information,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072 [2]中国洛阳电子装备试验中心,河南洛阳471000

出　　处：《雷达科学与技术》2018年第1期79-86,共8页Radar Science and Technology

基　　金：国家自然科学基金(No.61271400);湖北省技术创新专项重大项目(No.2016AAA017);苏州市重点产业技术创新专项(重点产业技术创新)项目(No.SYG201620)

摘　　要：外辐射源雷达利用第三方信号作为照射源来探测目标,参考通道中的信号重构和监测通道中的杂波抑制是外辐射源雷达信号处理流程中的关键部分。主要讨论了OFDM波形照射源信号,并从理论上分析了采样定时偏差在参考信号重构、时域杂波抑制和匹配接收性能的影响。理论分析和仿真表明,采样定时偏差的存在会减少重构后的参考信号和监测信号的相关性,降低时域杂波抑制性能以及匹配接收的目标信噪比。基于WiFi信号帧结构的特点,提出了一种对采样定时偏差估计和补偿的方法,并在实测数据中验证了该方法的有效性。Passive radar uses non-cooperative illumination source to detect targets.Signal reconstruction in the reference channel and clutter rejection in the surveillance channel are key steps in passive radar signal processing.In this paper,we mainly discuss OFDM signals.Then we analyze the impact of the sampling timing offset on the performance of the reference signal reconstruction,time domain clutter suppression and target correlation matching.Theoretical analysis and simulation show that sampling timing offset can reduce the correlation between the reconstructed reference signal and the surveillance signal,the performance of time domain clutter suppression and the matching target signal to noise ratio.Based on the characteristics of WiFi signal frame structure,this paper proposes an algorithm which can estimate and compensate the sampling timing offset.The experimental results verify the effectiveness of the proposed algorithm.

关 键 词：外辐射源雷达 采样定时偏差 信号重构 杂波抑制 

分 类 号：TN958.97[电子电信—信号与信息处理]