低空目标探测多径存在性判决算法  

Multipath Existence Decision Algorithm for Low Altitude Target Detection

作　　者：刘煜孜 代大海[1] 徐振海[1] 王罗胜斌 LIU Yuzi;DAI Dahai;XU Zhenhai;WANG Luoshengbin(College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学电子科学学院,长沙410073

出　　处：《现代雷达》2022年第10期54-58,共5页Modern Radar

摘　　要：低空目标的多径效应严重影响雷达的探测性能,多径存在性检测是低角跟踪的关键环节。文中建立多径效应下的低空目标复单脉冲比模型,通过复单脉冲比指示镜面反射干扰强度,按照多径存在与否,分析复单脉冲比的统计特性,推导判决门限,形成低空目标多径存在性判决算法,并且结合两种真实飞行场景,仿真分析算法性能与目标高度、距离以及信噪比的关系。仿真结果表明,所提判决算法在低信噪比条件下仍然有效;在飞机目标平飞和降落场景下,可准确判决多径的存在性,为提升雷达测高性能提供支撑。The multipath effect of low altitude target seriously affects the detection performance of radar and multipath detection is the key link of low angle tracking. In this paper, the multiple monopulse ratio model of low altitude target under multipath effect is established. The multiple monopulse ratio is used to indicate the interference intensity of mirror reflection. According to whether multipath exists or not, the statistical characteristics of the complex monopulse ratio are analyzed and the decision threshold is derived to form the multipath existence decision algorithm of low altitude target. The relationship between algorithm performance and target altitude, distance and signal to noise ratio(SNR) is analyzed by simulation. Simulation results show that the proposed algorithm is still effective under low SNR conditions. In plane flying and landing scenarios, the existence of multipath can be accurately determined, which provides support for improving the performance of radar measurement.

关 键 词：低空目标跟踪 多径效应 存在性判决复单脉冲比 极大似然估计 

分 类 号：TN953[电子电信—信号与信息处理]