高压输电线散射斑雷达像空间位置形成条件分析

摘要

There are bright scattering spots in the high resolution image of TerraSAR in scanning mode .In this paper ,the SAR image of 1 000 kV high voltage transmission line in Hubei and the coordinates of towers have been calculated ,in order to analyze the forming condition and spatial position variation of scattering spots occurred in 150 groups of transmission lines .Studies have shown that the angle ,span and sag of the transmission line make main contribution to the forming condition and spatial position of the scattering spots . The scattering spots occur when the angle is within ± 15 degree . When the angle increases ,the scattering spots move from north to south . Calculation results and further statistical analysis show that the position of scattering spots is not with a linear relationship with angle . The transmission line in same angle ,w hen the span increases ,the position of the spots moves to the center of transmission line .%TerraSAR雷达卫星条带模式影像中高压输电线产生亮度极高的散射斑点，利用湖北段1000 kV特高压输电线路的雷达影像和铁塔G PS坐标，研究了该区域150组输电线散射斑的形成条件和雷达像空间相对位置变化规律。研究表明，输电线的夹角、跨度和垂曲率是影响散射斑形成以及雷达像空间位置的主要因素。输电线散射斑产生于导线与卫星飞行方向的夹角±15°以内。当夹角由负到正变化时，其导线散射斑在雷达像空间的位置由北向南移动，但是其移动量与夹角变化不成正比。在夹角近似相同的情况下，导线跨度越大即其垂曲率越大，散射斑的位置越靠近导线垂直平分线。