中文说明：
SAR成像处理的过程是从回波数据中提取目标区域散射系数的二维分布，本质上是一个二维相关处理过程,因此最直接的处理方法是对回波进行二维匹配滤波，但其运算量很大，再加上SAR的数据率本来就高，这使得实时处难于实现。通常，可以把二维过程分解成距离向和方位向两个一维过程，Range-Dopper Algorithm（简称RD算法）
English Description：
The process of SAR imaging processing is to extract the two-dimensional distribution of the scattering coefficient of the target area from the echo data, which is essentially a two-dimensional correlation processing process. Therefore, the most direct processing method is to carry out two-dimensional matched filtering on the echo, but it has a large amount of computation, and the SAR data rate is high, which makes it difficult to achieve real-time processing. Generally, the two-dimensional process can be decomposed into two one-dimensional processes: range Doppler algorithm and azimuth algorithm