雷达大下视角下地杂波特性分析  

Characteristic Analysis of Ground Clutter Received by Radar UnderLarge Downlook Angle Conditions

作　　者：高希 杜勇[1] 高晓明 GAO Xi;DU Yong;GAO Xiaoming(Xi’an Electronic Engineering Research Institute,Xi’an 710000)

机构地区：[1]西安电子工程研究所,西安710100

出　　处：《火控雷达技术》2022年第3期40-45,共6页Fire Control Radar Technology

摘　　要：在大下视角场景应用时,雷达的目标检测性能极易受到地杂波的影响。而且在大下视角下,地杂波存在明显的空时耦合效应,使地杂波无法被完全抑制。为了研究雷达大下视角下地杂波的特性,采用假设检验、分布拟合的方法对相关实测数据进行分析,统计出其对应的幅度分布,并对其相关性、峰度和偏度等进行研究,为后续大下视角下目标检测算法的研究提供理论支撑。通过分析,大下视角下地杂波与韦布尔分布更加接近,并具有相当长的时间相关性,但相邻距离单元之间的空间相关性很低。因此,大下视角下地杂波出现了大量孤立散射点,其幅度服从韦布尔分布,且出现了更多复杂的特性,传统的单元平均恒虚警检测器已不再适用。When a radar is used in a large downlook angle scene,its target detection performance is extremely susceptible to ground clutter.Moreover,the ground clutter has a significant space-time coupling effect under large downlook angle conditions,so that it cannot be completely suppressed.In order to study the characteristics of the ground clutter received by a radar under large downlook angle conditions,hypothesis testing and distribution fitting methods are used in this paper to analyze the measured data,and the corresponding amplitude distribution is calculated.In addition,the correlation,kurtosis,and skewness are calculated.The analysis and calculation provide theoretical support for the subsequent research on target detection algorithms for large downlook angle scenarios.The analysis results show that the amplitude of ground clutter under large downlook angle conditions is similar to the Weibull distribution.In addition,the ground clutter has fairly high time correlation and very low spatial correlation between adjacent range cells.Therefore,there are a large number of isolated scattering points in the ground clutter under large downlook angle conditions,the amplitude of such ground clutter obeys the Weibull distribution,and more complex characteristics appear.The traditional cell average constant false alarm detector is no longer suitable to suppress such ground clutter.

关 键 词：大下视角 杂波分布 分布拟合 假设检验 韦布尔分布 

分 类 号：TN957.51[电子电信—信号与信息处理]