毫米波捷变频体制下低空风切变风速估计方法  

Wind Speed Estimation of Low-altitude Wind-shear Under MMW Frequency Agile System

作　　者：李海[1] 呼延泽 高霞 LI Hai;HUYAN Ze;GAO Xia(Tianjin Key Lab for Advanced Signal Processing,Civil Aviation University of China,Tianjin 300300,China;Aviation Industry Corporation of China Leihua Electronic Technology Research Institute,Wuxi,Jiangsu 210403,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,天津300300 [2]中国航空工业集团公司雷华电子技术研究所,江苏无锡210403

出　　处：《信号处理》2021年第3期428-436,共9页Journal of Signal Processing

基　　金：民机项目(MJ-2018-S-28);航空基金项目(20182067008)。

摘　　要：机载气象雷达下视探测低空风切变时,复杂的电磁干扰及强地杂波会严重影响其对目标信号的检测,造成风场速度估计失准。针对上述问题,本文提出一种毫米波(millimeter wave, MMW)捷变频体制下的低空风切变风速估计方法。该方法采用载频脉组间捷变,在每个脉组内利用雷达系统先验信息设计两维两脉冲对消(two dimensional pulse-to-pulse canceller, TDPC)预滤波器对雷达回波进行预滤波,削弱杂波功率,接着利用基于组合空时主通道的自适应处理(combined space-time main channel adaptive processing, CMCAP)对回波数据进行空时二维滤波,得到风切变信号的模糊多普勒估计值,最后将每个脉组内的估计结果由多普勒频率域转换到速度域,采用错位差分查表的方式订正模糊速度,从而得到风场的真实速度值。仿真结果分析验证了所提方法的有效性。Complex electromagnetic interference and strong ground clutter will seriously affect the detection of the target signal when airborne weather radar is used to detect the low-altitude wind-shear, resulting in the inaccurate estimation of wind speed. To solve these problems, this paper presents a method of wind speed estimation of low-altitude wind-shear in MMW(millimeter wave) frequency agile system. In this method, two dimensional pulse-to-pulse canceller(TDPC) prefilter is designed in each pulse group by using radar system prior information to prefilter radar echo and weaken clutter power. Then, the combined space-time main channel adaptive processing(CMCAP) is used to filter the echo data in two dimensional space-time, obtains the Doppler ambiguity estimation value of the wind-shear signal, finally transforms the estimation result in each pulse group from the Doppler frequency domain to the velocity domain, uses the dislocation difference table method to revise the speed ambiguity, thus obtains the real speed value of the wind field. The simulation results show the effectiveness of the proposed method.

关 键 词：毫米波捷变频雷达 两维两脉冲相消-组合空时主通道自适应处理 错位差分查表法 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]