基于多通道LFMCW雷达的低空风切变风速估计方法  

Wind Speed Estimation of Low-Altitude Wind-Shear Based on Multi-channel LFMCW Radar

作　　者：李海[1] 段佳玲 呼延泽 宋迪 Li Hai;Duan Jialing;Hu Yanze;Song Di(Tianjin Key Lab for Advanced Signal Processing,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学天津市智能信号与图像处理重点实验室

出　　处：《信号处理》2019年第11期1800-1809,共10页Journal of Signal Processing

基　　金：工信部民机专项项目(MJ-2018-S-28);航空基金(20182067008);国家自然科学基金(U1733116);中央高校基本科研业务费专项资金(3122018D008)

摘　　要：在飞机起飞和进近着陆阶段中,风切变是一种对飞行危害最大的气象现象,如何有效地探测风切变并及时地规避危险对保障飞行安全至关重要。本文提出了一种将多通道线性调频连续波(Linear Frequency Modulated Continuous Wave, LFMCW)雷达应用于低空风切变检测中的实现方法。首先介绍了多通道LFMCW雷达的信号模型,然后利用空时自适应处理(Space-Time Adaptive Processing, STAP)方法抑制地杂波并匹配风切变信号,最后通过双脉冲重复频率(Dual-Pulse Repetition Frequency, D-PRF)解速度模糊法订正模糊速度,从而实现了风速的精确估计。后续实验仿真结果证明了本文所提方法的有效性。During the take-off and approach landing phases of the aircraft, wind shear is a meteorological phenomenon that seriously endangers the safety of aircraft, how to effectively detect wind shear and timely avoid danger is essential to ensure flight safety. In this paper, an implementation method of applying multi-channel linear frequency modulated continuous wave(LFMCW) radar to low-altitude wind shear detection is proposed. Firstly, the signal model of multi-channel LFMCW radar is introduced. Then the space-time adaptive processing(STAP) method is used to suppress the ground clutter and match the wind shear signal. Finally, the dual-pulse repetition frequency(D-PRF) resolve velocity ambiguity algorithm is used to correct the velocity ambiguity, thereby achieving an accurate estimation of wind speed. The results of the following simulation prove the effectiveness of the proposed method.

关 键 词：线性调频连续波雷达 空时自适应处理 低空风切变 风速估计 

分 类 号：TN959.4[电子电信—信号与信息处理]