K分布杂波下雷达导引头检测器设计  

Design of Radar Seeker Detector for K Distribution Clutter

作　　者：杨勇[1] 肖顺平[1] 冯德军[1] 张文明[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《电子学报》2012年第12期2533-2538,共6页Acta Electronica Sinica

基　　金：国家自然科学基金(No.61072119);国防科技大学优秀研究生创新资助项目(No.B110406);湖南省研究生科研创新项目(No.CX2011B021)

摘　　要：针对K分布杂波下雷达导引头平方律检测器检测性能急剧下降这一问题,设计了一种性能较好、易于实现的雷达导引头检测器.首先,结合K分布的复合高斯特性,推导得到了多次观测下的多维K分布联合概率密度函数;然后,采用广义似然比检验,推导得到了广义似然比检验统计量;鉴于该统计量实现困难,通过对导引头接收信号进行预处理,实现了杂波预白化和目标信号能量累加,同时大大简化了广义似然比检验统计量,基于简化的统计量,给出了检测器结构.最后,以导引头检测Swerling I型目标为例,理论分析与仿真实验相结合,分析了所设计检测器的检测性能,仿真结果验证了检测器的有效性.Detection performance of square-law detector of radar seeker decreases severely in K disllibuted clutter. To ad- dress this problem, a novel radar seeker detector is designed which has good performance and is prone to be implemented. According to the compound Gaussian characteristics of K distribution,multidimensional joint probability density function of K distribution is de- rived. Then generalized likelihood ratio test statistic is obtained from generalized likelihood ratio test. As the test statistic is compli- cated and difficult to be implemented in real radar seeker system, the received signal of radar seeker is preprocessed to simplify the test statistic and the preprocessing whitens the clutter and accumulates the target signal power at the same time. The structure of the designed detector is given based on the simplified test statistic. Finally, detection performance of the designed detector for Swerling I targets is analyzed by simulation. Simulation results demonslrate the validity of the detector.

关 键 词：K分布 杂波 雷达导引头 检测器 虚警概率 

分 类 号：TN957.51[电子电信—信号与信息处理]