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二次反射效应对建筑物的影响在高分辨率SAR图像中是一个非常重要的特征,二次反射效应主要是由建筑物的墙面和地面形成的二面角造成的强反射。为了在建筑物自动提取和重建技术中有效地利用这个特征,需要对真实高分辨率SAR图像中因建筑物结构和地面材料影响造成的多次散射的稳定性差异进行监测。本文主要利用高分辨率TerraSAR-X图像分析不同方位角情况下建筑物与两种不同材料的地面形成的二次反射效应的影响,进一步对分析结果与理论电磁模型模拟的结果进行比较,结果发现,如果建筑物周围由柏油马路包围,其形成的多次散射强度随着方位角从0°到10°急速衰减,当方位角大于10°时,衰减比较缓慢;如果建筑物周围都是草坪,较小方位角处的散射强度衰减就不是那么明显了,而且在整个方位角范围内变得更加平滑连续了。
The effect of secondary reflectance on buildings is a very important feature in high-resolution SAR images. The secondary reflectance effect is mainly due to the strong reflection caused by the dihedral angle formed by the wall and ground of the building. In order to effectively utilize this feature in automatic building extraction and reconstruction techniques, the stability variability of multiple scattering due to the influence of building structure and ground material in real high-resolution SAR images needs to be monitored. In this paper, the effect of the secondary reflection effect of the buildings and the ground of two different materials under different azimuth angles is analyzed by using the high-resolution TerraSAR-X image. The results of the analysis and the results of the theoretical electromagnetic model simulation are further analyzed. If the building is surrounded by tarmac, the intensity of multiple scattering formed by it decay rapidly from 0 ° to 10 ° with the azimuth angle. When the azimuth angle is greater than 10 °, the attenuation will be relatively slow. If the buildings are surrounded by lawns, Scattering intensity decay at smaller azimuths is less noticeable, and smoother and continuous over the entire azimuth range.