高斯杂波中距离扩展目标的模糊CFAR检测  

Fuzzy CFAR detection for range-extended targets in Gaussian clutter

作　　者：郝程鹏[1] 蔡龙[1] 陈模江[1] 

机构地区：[1]中国科学院声学研究所,北京100190

出　　处：《系统工程与电子技术》2010年第4期678-681,共4页Systems Engineering and Electronics

基　　金：国家自然科学基金(60802072)资助课题

摘　　要：为提高高分辨雷达的检测性能,提出了一种高斯杂波背景下距离扩展目标的模糊检测方法。该方法采用模糊恒虚警率(constant false alarm rate,CFAR)检测器代替传统的二进制CFAR检测器,将距离单元值转换成映射到虚警空间的模糊隶属函数值,然后采用模糊积累准则进行积累,得到检测统计量。研究了模糊代数积、模糊代数和两种积累准则,推导出这两种方法虚警概率的数学解析式。仿真结果表明,高斯杂波背景下模糊代数积积累较双门限二进制积累可获得近2 dB的性能改善。同时,模糊检测方法只采用单个检测门限,具有易于调节的优点。In order to improve the detection performance of the high resolution radar（HRR）,a new detection scheme of range-extended targets based on fuzzy logic is proposed.It computes the values of the membership function to the false alarm space from the samples of the reference cells by replacing the conventional binary constant false alarm rate（CFAR） detector with a fuzzy CFAR detector.Then these values are combined according to fuzzy integrators to produce a global detection statistic.The fuzzy algebraic sum integrator and the fuzzy algebraic product integrator are considered,and the analytic expressions of the false alarm rate for them are derived.Simulation results show that the fuzzy algebraic product integrator renders nearly 2 dB improvement of SNR over the binary integrator in Gaussian clutter.In addition,these fuzzy integrators have the characteristic that the false alarm rate can be tuned using a single threshold,more easily than that of the dual-threshold binary integrator.

关 键 词：高分辨雷达 距离扩展目标 检测 恒虚警 隶属函数 

分 类 号：TN957.51[电子电信—信号与信息处理]