基于圆迹SAR的建筑物轮廓信息提取

摘要

利用圆迹SAR 对目标的全方位观测的特点，该文提出一种基于圆迹 SAR 数据的建筑物轮廓信息提取以及所处地面的高度估计的方法。首先，通过雷达立体测量的方法粗估计出目标建筑物所处地面的海拔高度。然后，以该高度为基准上下一定范围内划分多个成像平面层，在各个成像平面上对建筑物进行圆迹SAR成像。最后，在圆迹SAR图像中选择建筑物二次反射亮线构成封闭线框的一副图像，从该幅图像中提取建筑物在水平面的轮廓信息，同时将该图像对应的成像平面高度确定为目标建筑物所在地面的高度。P波段机载圆迹SAR实测数据验证了该方法的有效性。%Take the advantage of all-directional observation of circular SAR, an approach of the outlines extraction of building footprints from the circular SAR data is presented, while the approach can also be used for estimating the ground altitude around the building. The proposed approach is as follows: firstly, the rough altitude of the ground around the building is estimated by radargrammetric Digital Elevation Model (DEM) extraction, secondly, image planes are set in certain range where the estimated altitude is in the middle, and circular SAR image of the building is obtained on each image plane. Finally, one image is selected where a closed polygon frame is formed by the double bounce scattering bright lines from the building, and the outlines of building footprints are extracted from the image, while the altitude corresponding to the imaging plane is defined as the altitude of the ground around the target building. The proposed method is validated by the circular SAR data processing by the experimental SAR airborne system at P bands.