多基地雷达中双门限CFAR检测算法  

Double Threshold CFAR Detection for Multisite Radar

作　　者：胡勤振[1] 苏洪涛[1] 周生华[1] 刘子威[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《电子与信息学报》2016年第10期2430-2436,共7页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61372134;61401329)~~

摘　　要：针对多基地雷达系统,该文为解决传统集中式检测算法数据传输率大的问题,根据广义似然比检测算法和自适应匹配滤波算法,提出两种双门限恒虚警率检测器:双门限广义似然比检测器和双门限自适应匹配滤波检测器。首先各个局部雷达站将超过第1门限的局部检验统计量传送到融合中心。然后融合中心根据局部雷达站传送的数据计算融合后的全局检验统计量,并与第2门限比较,得到最终的判决结果。在各空间分集通道的信杂噪比假设相同的条件下,给出了双门限自适应匹配滤波检测器的虚警概率和检测概率的解析表达式。仿真结果表明,两种双门限检测器在低数据率传输时能够保持较好的检测性能。For multisite radar system, to solve the data transmission rate problem, two kinds of Double Threshold Constant False Alarm Rate （DT-CFAR） detectors, the DT Generalized Likelihood Ratio Test （DT-GLRT） detector and the DT Adaptive Matched Filter （DT-AMF） detector, are proposed based on the GLRT and the AMF algorithms. Fisrt, the local test statistics which exceed the first threshold are transferred to the fusion center. Then, the global test statistic is obtained from the local test statistics and the final decision is made compared to the second threshold in the fusion center. The closed form expression for probabilities of false alarm and detection of the DT-AMF detector are also given when the Signal to Clutter plus Noise Ratios （SCNRs） are identical in the spatial diversity channels. Simulation results illustrate that the DT-CFAR detectors can maintain a good performance with a low communication rate.

关 键 词：雷达 双门限检测 恒虚警率检测 广义似然比检测 自适应匹配滤波 

分 类 号：TN957.51[电子电信—信号与信息处理]