特高压输电铁塔聚束模式SAR干涉特性研究与覆冰试验

Study on the UHV transmission tower’s interferometry and icing character in TerraSAR spotlight images

本文基于多幅TerraSAR卫星聚束模式SAR影像,研究了武汉特高压试验基地内特高压输电铁塔的雷达散射机制和干涉特性。利用高精度LiDAR扫描铁塔并进行三维建模,基于SAR几何成像关系分析了铁塔不同部位的散射几何关系。对比分析了基于散射强度和投影几何关系量测的铁塔横担间的高差,以及干涉图中相位变化反演的高差。结果表明相位推算的高差受噪声的干扰较大。本文对覆冰铁塔构件的雷达影像进行了理论分析和数据统计。结果表明,10 cm覆冰厚度破坏了铁塔构件二面角散射条件,造成雷达散射信号强度衰减了约8 dB,这表明输电铁塔雷达散射强度的变化可用于量化评估铁塔的覆冰状态。

This paper studies the Ultra High Voltage(UHV)transmission tower radar scattering mechanism and interferometry in TerraSAR Spotlight images.LiDAR scanning and 3D modeling tower,we analyze the scattering geometric relationship of tower's different parts based on the SAR geometric imaging relationship.Comparing and analyzing the height difference between the cross-arms of the tower based on the scattering intensity and phase change,the results show that the phase estimation is greatly interfered by the noise.In this paper,the theoretical analysis and data statistics of the radar image of the ice tower are carried out.The results show that the 10 cm ice thickness damages the dihedral scattering condition of the tower component,which causes the radar scattering signal intensity to attenuate significantly by about 8 dB.It is verified that the radar scattering intensity changes of transmission tower can be used to evaluate quantitatively the ice coating status.