基于双门限控制的机载气象雷达地杂波抑制方法  

Ground Clutter Suppression with Dual-threshold Controlled Method for Airborne Weather Radar

作　　者：韩雁飞[1] 吴仁彪[1] 李海[1] 

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

出　　处：《雷达学报（中英文）》2013年第1期97-104,共8页Journal of Radars

基　　金：国家自然科学基金项目(61071194;60979002);中国民航大学基金项目(2011kyE06)资助课题

摘　　要：针对机载气象雷达工作于风切变模式时的地杂波抑制问题,该文提出了一种双门限控制的自适应地杂波抑制方法。该方法在有效估计杂波谱中心和谱宽的基础上,利用每个距离单元的回波功率信息设计双门限控制的自适应凹口滤波器,在最大程度上滤除地杂波的同时,减小杂波残余对风切变信号的影响。仿真结果表明,该方法具有良好的杂波抑制效果,并能有效地提高风切变信号风速估计的准确性。In this paper, a new method of dual-threshold controlled adaptive clutter suppression is proposed for an airborne weather radar operated in the wind shear mode. To reliably estimate the center frequency and bandwidth of the clutter spectrum, the echo power in each range cell is used to design a dual-threshold controlled adaptive notch filter. This filter can reject the maximum amount of ground clutter, while reducing the effect of clutter residue on the wind shear signal. Results of our simulation have confirmed that this method has a superior clutter suppression performance, and can effectively improve the wind speed estimate accuracy of the wind shear signal.

关 键 词：机载气象雷达 地杂波抑制 双门限控制 自适应滤波器 风切变 

分 类 号：TN959.4[电子电信—信号与信息处理]