研究SAR信号模型，主要是得到特定工作模式下回波信号与测绘带散射系数分布之间的解析关系。SAR成像算法实质上是从回波信号中通过信号变换得到测绘带的散射系数分布。-Study of SAR signal model, mainly to be a specific job mode echo signal and mapping the distribution of scattering coefficient with the relationship between the analytic