Azimuth preprocessing is the key to real-time SAR processor, the precision of computation in the azimuth preprocessing has an impact on the azimuth focus quality.

实时方位向预处理是SAR实时成像处理器设计中的关键环节，预处理中运算精度的高低直接影响着SAR图像方位向聚焦的好坏。

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This paper describes the design and realization of the azimuth preprocess in the real-time imaging processor of SAR with programmable logic device by the method of sub-aperture using band-pass filter.

该文讨论了在合成孔径雷达实时成像处理器中，采用子孔径带通滤波成像处理方法的方位预处理的设计，构造了一种用大规模可编程逻辑器件实现方位预处理的电路结构。

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The experiment results of the real-time signal processor show that this method can effectively compensate the airplane motion error in real-time, and improve the SAR image quality.

实时信号处理机的实验表明，本文方法能实时和有效的实现机载SAR运动补偿，获得满意的成像质量。

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