DEM分形内插方法及其在消除SAR图像地形畸变中的应用

在利用数字地面高程模型（DEM）对合成孔径雷达9SAR）图像进行几何校正时,DEM的分辨率起着非常关系的作用。为了得到高分辨的DEM数据,讨论了“局部分数布主朗场”模型,并在此基础上提出了一种局部自适应DEM插值方法,使用这种方法进行DEM内插,并将插值后得到的高分辨率DEM数据应用于SAR图像的地形畸变校正,取得了很好的实验效果。

On Improving Rectification of SAR Image

SAR (Synthetic Aperture Radar) images are usually distorted because radar travels at an angle with the vertical and the terrain is often quited jagged. In order to get good rectification of distortion of SAR image, high resolution of DEM is indispensable. For obtaining high resolution of DEM, we employ "local fractional Brownian field", a mathematical tool occasionally utilized in the field of radar image processing. In section 2, we discuss in much detail how to utilize "local fractional Brownian field" to obtain high resolution of DEM. In section 3, we present experimental results. Fig.6 shows SAR image before rectification and Fig.7 shows SAR image after rectification. Experimental results show preliminarily that our utilization of "local fractional Brownian field" is not only feasible but also effective in improving rectification of SAR image.