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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 the imaging requirements of airborne Synthetic Aperture Radar (SAR), this paper presents an evaluation criterion for the design of downsampling filter to minimize the ratio of the sidelobe energy to the passband energy of the aliasing into the passband after down-sampling. After deducing the Lagrange multiplier method, the steps of solving the FIR filter are given.According to the comparison between the two filters which use the antenna pattern and the antenna pattern, the conclusions are as follows: For the airborne SAR Down-sampling filters for real-time imaging systems Special designs that consider antenna patterns are necessary.