地面粗糙起伏对分布式小卫星SAR回波信号相关性影响分析
doi: 10.3724/SP.J.1146.2006.01532
A Study of the Influence of Ground Fluctuation and Roughness on the Correlation Between Distributed Small Satellites SAR Echoes
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摘要: 该文讨论了地面的粗糙和起伏对分布式星载SAR回波信号相关性的影响。首先利用小平面单元理论建立了粗糙地面的散射模型，并对其统计特性进行了分析；之后，以服从瑞利分布的二维相关随机过程作为地面的起伏模型对分布式星载SAR起伏地面回波信号的相关性进行了仿真分析。仿真结果表明当分布式小卫星基线垂直航向分布时，地面的起伏对回波间的相关性影响较大；而分布式小卫星基线沿航线分布时，地面起伏对其回波间的相关性影响则相对较小。Abstract: This paper deals with the influence of ground fluctuation and roughness on the correlation between distributed Satellites SAR echoes. The model for a rough surface is presented based on the facet theory followed by the analysis of its statistical scattering property. Their influences are shown with several simulation results, where the terrain fluctuation is imitated with a 2-dimention correlative stochastic process，which indicate that the ground fluctuation and roughness deteriorate the correlation if the two satellites are cross-track separated, but have a little influence on the correlation if the two satellites are along-track separated.
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