The Simulation and Characteristics Analysis on High Resolution SAR Images of Bridges
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摘要: 该文针对多径散射特征,给出了一种高分辨率SAR图像的仿真与特性分析方法,以桥梁目标为例开展了分析,该仿真方法从SAR工作原理出发,利用几何光学法计算和分析桥梁目标的单次散射情况和多径散射情况,并根据雷达工作原理和成像机理利用散射数据获得仿真SAR图像。文中选择了悉尼大桥为研究对象,利用分辨率为1 m的Terra-SAR数据开展了实验,仿真获得的SAR图像与实际SAR图像的主要散射特征一致,验证了方法的有效性;同时,根据仿真算法的分析过程,文中给出了悉尼大桥SAR图像主要散射特征的细节解释。实验表明,该方法能够有效获得目标的多径散射特征,同时能够有效辅助目标的SAR图像理解工作。Abstract: An approach for simulation and analysis on the high resolution Synthetic Aperture Radar (SAR) images is provided and bridges are chosen for analysis. According to the principle of SAR, the Geometry Optics (GO) is employed to calculate the direct scatterings and multi-path scatterings of the bridge in this approach. In this study, the Sydney Bridge is chosen for analysis, and the Terra-SAR data with 1 m resolution is used. The results show that, the main properties of the bridge with the simulation and the real data are consistent, which tests the validity of the approach. Furthermore, according to the simulation process, the main scattering characteristics of the SAR image of the Sydney Bridge are interpreted. The experiments show that this approach can provide the main scattering characteristics of the target, and also show that it can be helpful for SAR images interpretations.
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