针对超高压输电导线的散射亮斑时间序列分析

Analysis on scatterers time series of extra-high voltage power line

针对超高压输电导线在高分辨率雷达影像上表现出的强散射特性,该文提出了一种自动提取输电导线强散射亮斑中心位置的算法。采用自适应窗口最大相关系数法,较精确地提取了强散射斑的位置,实现对散射亮斑亮度、面积、位置的时序分析。基于此算法的实验结果表明:输电导线散射亮斑的亮度峰值、50db以上的散射面积以及中心位置在时序影像中均发生不同程度的变化,并表明散射亮斑位置受导线弧垂影响,且温度是改变弧垂曲率和导线散射几何关系的主要因素。

In order to analyze the strong scattering characteristics of extra-high voltage power lines in high resolution SAR image,a method to extract the central position of the power line scatterers automatically was proposed in this paper.Using adaptive window maximum coherence algorithm,the scatterers position was acquired accurately and each of the line scatterers＇ magnitude,area and position was analyzed during data acquiring period.Experimental results showed that the maximum magnitude of the power line scatterers,the scattering area above 50 dB and the central position of the scatterers changed in various trend in time series SAR images.It also showed that the reflection position of power lines was affected by the power lines sag,and it seemed that the temperature should be the main factor that changed the sag position and changed the reflection geometry.