拉格朗日乘子法在机载SAR成像系统降采样滤波器设计中的应用  

Application of Lagrange Method in the Design of Desampling FIR Filter of Airborne SAR Real-time Imaging System

作　　者：徐永健[1] 娄晓光[1] 王贞松[1] 

机构地区：[1]中国科学院电子学研究所,北京100080

出　　处：《电子学报》2000年第12期11-14,共4页Acta Electronica Sinica

基　　金：国家自然科学基金(No.69896250-2)

摘　　要：根据机载合成孔径雷达 (SAR)的成像要求 ,本文对降采样滤波器的设计提出了使降采样后将混迭进通带的旁瓣能量与通带能量之比为最小的评价标准 .在对拉格朗日乘子法做了详细的推导后给出了FIR滤波器求解的步骤 .通过对利用天线方向图和不考虑天线方向图的两滤波器的比较得出结论 :对于机载SAR实时成像系统的降采样滤波器考虑天线方向图的专门设计是必要的 .According to airborne SAR imaging requirement we define the minimum ratio of alias′ energy,which will overlap into passband after desampling,to passband energy as the proper criterion for the design of the desampling filter of the SAR real time imaging system.After developing Lagrange multiplier algorithm,we provide steps to obtain the optimal desampling FIR filter.With comparing two filters,one takes account effect of the antenna radiation pattern and the other doesn′t.We conclude that it is necessary to design a specific desampling filter that includes the effect of the radiation pattern of the antenna.

关 键 词：降采样滤波器 拉格朗日乘子法 机载SAR实时成像系统 

分 类 号：TN957.51[电子电信—信号与信息处理] TN713[电子电信—信息与通信工程]