K分布杂波下雷达导引头检测器设计

 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.

Design of Radar Seeker Detector for K Distribution Clutter

Detection performance of square-law detector of radar seeker decreases severely in K distributed clutter.To address 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 derived.Then generalized likelihood ratio test statistic is obtained from generalized likelihood ratio test.As the test statistic is complicated 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 demonstrate the validity of the detector.