飞机尾流雷达探测的时-频-空域联合处理

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.

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

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.