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。该文从有限字长角度出发，分析了预处理中滤波器系数量化误差和相乘截取误差对方位向脉冲压缩性能的影响，并提出了降低误差的方法。文中首先针对几种常用的量化字长进行分析，对比了不同的量化字长对滤波器性能的影响最后给出了经过脉冲压缩后的仿真结果。

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. According to the finite-wordlength characteristic, the errors, which are from quantization and multiplicative roundoff, and the effects on the performance of the pulse compression are analyzed. In this paper, firstly, several familiar quantization world.lengths are analyzed and the impacts on filter performance caused by different finite quantization wordlength are compared, at the last, the result of simulation after pulse compression is given.

TN957.52 TN958

国家863计划资助项目.