雷达探测系统中目标位置和幅相信息量研究  

Research on Location and Amplitude-Phase Information of Target in Radar Detection System

作　　者：徐大专[1] 陈越帅 陈月 许生凯 Xu Dazhuan;Chen Yueshuai;Chen Yue;Xu Shengkai(College of Electronic and Information Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,211106,China)

机构地区：[1]南京航空航天大学电子信息工程学院,南京211106

出　　处：《数据采集与处理》2018年第2期207-214,共8页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(61471192;61371169)资助项目;江苏省高等学校优势学科建设工程资助项目

摘　　要：针对一般的雷达目标探测系统,建立了目标探测信息的理论模型,即采用香农信息论的思想和方法研究雷达探测过程中获得的关于目标的位置信息量和幅相信息量。该模型中,针对单目标检测,假设目标在观察区间内服从均匀分布,而散射系数分为常数和服从瑞利分布两种情形,推导出目标的位置信息和幅相相位信息的闭合表达式。在高信噪比条件下,获得了散射系数为常数情况下目标位置信息的解析表达式和克拉美罗界(Cramér-Rao bound,CRB)。理论分析表明,目标的位置信息量与雷达探测系统的时间带宽积(Time-bandwidth product,TBP)和信噪比(Signal to noise,SNR)的对数成线性关系。仿真结果验证了理论分析的正确性,并给出了雷达目标探测的两个重要阶段:目标捕获阶段和目标跟踪阶段。本文的研究工作对实际雷达探测系统设计具有重要的理论指导意义。A theoretical model of target detection is established for a general radar system.Specifically,we employ the thoughts and methodologies of Shannon′s information theory to research the location information and amplitude-phase information of targets in a radar detection system.In the proposed model,we derive closed expressions of location information and amplitude-phase information in a single target detection assuming the target follows a uniform distribution in the observation range for a constant scattering coefficient and Rayleigh distributed scattering coefficient correspondingly.And in the high signal-to-noise(SNR)regime,we obtain an analytic expression and Cramér-Rao Bound(CRB)of location information for a constant scattering coefficient.Theoretical analysis shows that the location information of the target is linearly proportional to both time-bandwidth product(TBP)of radar detection system and the SNR in dB.The simulation results validate the theoretical analysis and give two important stages of radar target detection,namely,target acquisition and target tracking.The work of this paper is of great theoretical significance for the design of real radar detection systems.

关 键 词：目标检测 位置信息 幅相相位信息 雷达系统 

分 类 号：TN911[电子电信—通信与信息系统]