飞机尾流雷达探测的时-频-空域联合处理  

Time-Frequency-Space Domain Processing for Radar Detection of Aircraft Wake Vortices

作　　者：李军[1] 王雪松[1] 刘义[1] 王涛[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《应用科学学报》2009年第2期150-155,共6页Journal of Applied Sciences

基　　金：武器装备探索研究(No.7130620)资助项目

摘　　要：针对相参多普勒雷达,提出了一种表征飞机尾流时-频-空域特性的雷达回波信号模型.导出了飞机尾流最佳似然比检测器及其在大脉冲数、小信噪比条件下的准最佳形式,证明了后者为时-频-空域联合处理结构,并具有不依赖于信号功率的恒虚警特性.导出了准最佳检测器检测概率和虚警概率的解析表达式及其近似形式.实验结果表明,时-频-空域联合处理技术可有效增强飞机尾流的雷达探测性能.In this paper, a signal model representing the time-frequency-space domain characteristics of aircraft wake vortices is established for coherent Doppler radar. The optimal likelihood ratio detector for detection of aircraft wake vortices and its quasi-optimal form for large number of pulses and low signal-to-noise ratio （SNR） are derived. The quasi-optimal form is shown to possess the structure of time-frequency-space domain processing and constant false alarm rate （CFAR） property independent of the signal power. Analytical expressions and their approximations for probabilities of detection and false alarm are derived for the quasi-optimal detector. The results indicate that the radar performance of detecting aircraft wake vortices can be effectively improved by using time-frequency-space domain processing.

关 键 词：飞机尾流 雷达检测 时-频-空域处理 恒虚警率 

分 类 号：TN957.51[电子电信—信号与信息处理]