| 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 |
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| 引用本文： | 徐永健,娄晓光,王贞松.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[J].电子学报,2000,28(12):11-14. |
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| 作者姓名： | 徐永健 娄晓光 王贞松 |
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| 作者单位： | 中国科学院电子学研究所,北京 100080 |
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| 基金项目： | 国家自然科学基金!(No .698962 50 2 ) |
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| 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.
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| 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 |
| 文章编号： | 0372-2112(2000)12-0012-04 |
| 收稿时间： | 1999-08-23 |
Application of Lagrange Method in the Design of Desampling FIR Filter of Airborne SAR Real-time Imaging System |
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| XU Yong jian,LOU Xiao guang,WANG Zhen song.Application of Lagrange Method in the Design of Desampling FIR Filter of Airborne SAR Real-time Imaging System[J].Acta Electronica Sinica,2000,28(12):11-14. |
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| Authors: | XU Yong jian LOU Xiao guang WANG Zhen song |
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| Affiliation: | Institute of Electronics Academia Sinica,Beijing 100080,China |
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| Abstract: | 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. |
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| Keywords: | desampling FIR filter Lagrange multiplier algorithm airborne SAR real time imaging sys |
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