利用星载SAR单轨多角度地距图像提取高程信息

Elevation extraction from multi-angle and ground-range images in single orbit based on spaceborne SAR

针对传统基于多个轨道上获得的不同星载SAR图像提取场景区域高程信息的方法具有系统复杂度较大的问题,该文提出一种利用星载SAR单轨多角度地距图像之间像点偏移量进行高程提取的方法。像点偏移是由星载SAR观测航迹的弯曲带来的。根据距离-多普勒原理,不同角度的地距子孔径图像之间存在与高程相关的像点偏移。文中推导了星载几何下高程值和像点偏移量之间的关系式,并得出了高程值和像点偏移量是近似线性关系这一结论,最后通过仿真实验验证了该方法。结果表明,该方法提取成像场景区域的高程信息是可行的。

Aiming at the problem that the traditional methods of extracting elevation information from different spaceborne SAR images acquired from multiple orbits had larger system complexity,a method of extracting elevation information from multi-angle and ground-range images acquired from single orbit based on spaceborne SAR was proposed.Image point's offset was caused by the curvature of observational track of spaceborne SAR.According to the principle of Range-Doppler,there was an image point's offset related to the elevation between ground-range subaperture images of different angles.In this paper,the mathmatic relation between the value of elevation and the image point's offset under SAR satellite geometry was derived quantitatively and the conclusion that there was an approximate linear relationship between them was concluded,finally the simulation experiments verified this method.The results showed that the method in this paper was feasible for extracting elevation information in imaging scene area.