基于RaySAR软件的上海外滩建筑群合成孔径雷达图像模拟

利用RaySAR软件对上海市外滩建筑群进行合成孔径雷达(SAR)成像模拟.绘制了不同反弹次数信号对应的反射率图、信号反弹次数分布图.结合目标的几何物理信息,分析了模拟SAR图像中的点、线状特征、不同反弹次数信号和建筑具体结构之间的对应关系.试验表明,雷达信号的反弹次数与建筑物结构细节密切相关.基于真实雷达影像序列,按PSInSAR方法选取的永久散射体点的位置及其分布与SAR模拟图像中的二次、尤其是三次反弹信号的成像吻合度较高,初步实现永久散射体点在建筑物上的精确定位.

Synthetic Aperture Radar Image Simulation of the Bund Building Group in Shanghai Based on RaySAR Software

SAR (synthetic aperture radar) image simulation of the Bund building group in Shanghai was conducted with RaySAR software. The reflectivity maps corresponding to different signal bounce levels and signal bounce level distribution map were plotted. Combined with the geometric and physical information of the targets, the relationship between punctate/linear signatures in simulated SAR image and building structure, different signal bounce level and building structure were analyzed. Seen from the experiment results, the bounce level of radar echo signal was closely related to the structural details of targets. The location and distribution of the Permanent Scatterers (PS) selected by PS InSAR on the real radar image sequences were in good agreement with the double, especially the triple bounce signals in the simulated SAR image. Therefore, the initial precise positioning of PSs on the buildings are realised.