说明：  距离多普勒（Range-Doppler，RD）算法是SAR成像处理中最直观，最基本的经典方法，目前在许多模式的SAR，尤其是正侧视SAR的成像处理中仍然广为使用，它可以理解为时域相关算法的演变。
(Range-Doppler (RD) algorithm is the most intuitive and basic classical method in SAR imaging processing. It is still widely used in many modes of SAR, especially in forward-looking SAR. It can be understood as the evolution of time-domain correlation algorithm.)