星载全方位SAR联合图像配准和DEM提取方法

Joint Coregistration and DEM Extraction Method for Spaceborne All-directional SAR Image Sequences

为了利用单颗合成孔径雷达(SAR)卫星单航过录取数据实现数字高程模型(Digital Elevation Model,DEM)的高精度提取,基于星载全方位SAR获取的多角度图像序列,提出了多角度SAR图像序列配准和DEM提取联合处理方法。该方法根据小方位夹角图像对间配准偏移量与大方位夹角图像对间配准偏移量之间的关系,以及配准偏移量与目标高程之间的关系构建线性方程组,利用最小二乘方法解算该方程组,同时获取配准偏移量和目标高程。仿真数据处理结果验证了该方法的有效性和精确性。

In order to realize the high-precision extraction of digital elevation model(DEM)by using single synthetic aperture radar(SAR)satellite single-pass recording data,a joint coregistration and height estimation method is proposed for the multi-angle image sequences acquired by the spaceborne all-directional SAR system.In the method,a system of linear equations is established based on the relationship between the shifts of image pairs with small azimuth angle intervals and the shifts of image pairs with large azimuth angle intervals,and on the relationship between the shifts and the target’s height.The least squares method is used to solve the system of linear equations,and the shifts and the heights of target are obtained simultaneously.The simulated experimental results verify the effectiveness and accuracy of the method.