雷达卫星影像中输电导线散射斑的相位时间序列稳定性分析

摘要

In this paper,20 stripe-map TerraSAR images taken in a year are chosen to analyze the 6 scatterers'phase between two power towers.The results of scatterers'phase dispersion statistics show that every single scatterer'phase is stable,and the standard deviation of scatterers'phases are about 0.2 rad.The top scatterer is selected as a reference point,and the differential phase with other 5 scatterers fluctuates beyond 2 rad.Because of the big fluctuation,the theoretical value cannot match the differential phase caused by height between towers.%分析输电导线散射斑相位的几何关系,选取20幅时间跨度约为1年的TerraSAR条带模式影像,对其中两基铁塔之间6条输电导线形成的散射斑相位时间序列进行分析.文中统计分析构成导线散射斑像元的相位离散度,其标准差约为0.2弧度,表明单个散射斑相位稳定.选取铁塔顶部点的导线散射斑为参考点,与另外5个导线散射斑做差分相位时间序列分析,分析导线之间高程差的理论计算值与实际值的一致性.分析结果显示,导线散射斑差分相位序列的波动可达2弧度以上,与导线间高程差产生的相位不一致.