大斜视SAR成像的一种新的二维可分离处理方法

A New Two-Dimension-Separated Approach to High Squint SAR Processing

大斜视角下SAR信号的特点表现为大的距离走动和小的距离弯曲,这使得采用横距域距离走动校正和二维可分离成像方法成为可能,但方位场景较大时要考虑方位向聚焦深度的限制。该文采用非线性调频变标的方法补偿方位向调频率随目标横距的变化,得到了良好的结果。

The high squint SAR signal features large range walk and small range curvature, which enable the raw data be compressed in range and azimuth separately. But in case of large azimuth scene size , complex algorithms must be used to cope with the constraint of the focus depth. In this paper a new two-dimension-separated method is presented to compensate the azimuth-dependent chirp rate using a non-linear chirp scaling operation. Finally simulation results are presented to verify the method.