在机载SAR实时成像处理器中，方位预滤波比的选取对最终获得的方位分辨率有决定性的影响。本文首先简要介绍了方位预滤波的原理和实现，然后推导了最佳预滤波比的选取公式，接着公式了预滤波比选取过程中影响分辩率的两个制约因素，最后举一个实例进行了具体的说明。

In an airborne SAR real time imager, the selection of azimuth pre filter ratio has a decisive effect on the final azimuth resolution. First this paper introduces the principle and implementation of azimuth pre filter, then derives the selection formula and analyses the two restriction factors on azimuth resolution in the selecting procedure. At last, an example is given to show the details.

TN957.52 TN959.73