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基于空时自适应处理的低空风切变风速估计方法
引用本文:吴仁彪,张彪,李海,卢晓光,韩雁飞.基于空时自适应处理的低空风切变风速估计方法[J].电子与信息学报,2015,37(3):631-636.
作者姓名:吴仁彪  张彪  李海  卢晓光  韩雁飞
作者单位: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
基金项目:国家自然科学基金,中央高校基本科研业务费项目(3122014D007)资助课题
摘    要:针对机载气象雷达在探测低空风切变时,有用信号会淹没在强杂波背景中的问题,该文提出一种基于空时自适应处理(STAP)的低空风切变风速估计方法。该方法首先利用空时插值原理校正机载前视阵地杂波的距离依赖性,获得多个独立同分布(IID)样本后估计地杂波协方差矩阵,然后构造适用于分布式低空风切变目标的空时自适应处理器,在自适应抑制地杂波的同时积累低空风切变信号,最终实现风场速度的精确估计。仿真结果表明,在高杂噪比、低信噪比的情况下,该方法可有效地自适应抑制地杂波并精确地估计风场速度。

关 键 词:机载气象雷达    低空风切变    风速估计    空时自适应处理
收稿时间:2014-05-27

Wind Speed Estimation for Low-attitude Windshear Based on Space-time Adaptive Processing
Wu Ren-biao,Zhang Biao,Li Hai,Lu Xiao-guang,Han Yan-fei.Wind Speed Estimation for Low-attitude Windshear Based on Space-time Adaptive Processing[J].Journal of Electronics & Information Technology,2015,37(3):631-636.
Authors:Wu Ren-biao  Zhang Biao  Li Hai  Lu Xiao-guang  Han Yan-fei
Abstract:When detecting low-attitude windshear with airborne weather radar, the real signals are usually covered with strong clutter. In this paper, a novel method of low-attitude windshear speed estimation based on Space-Time Adaptive Processing (STAP) is proposed to solve the above problem. The proposed method handles the range-dependence of clutter of airborne forward looking array with space-time interpretation theory to achieve the Independent and Identically Distributed (IID) samples used in the clutter covariance matrix estimation; then the space-time adaptive processor is constructed which is applicable to a distributed low-attitude windshear target to suppress clutter and accumulate windshear signal; finally the accurate estimation of wind speed is got. The experimental results show that the proposed method can achieve a superior clutter suppression performance and an accurate wind speed estimation in high clutter-to-noise ratio and low signal-to-noise ratio.
Keywords:Airborne weather radar  Low-attitude windshear  Wind speed estimation  Space-Time Adaptive Processing (STAP)
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