高压输电线路无线电干扰和电磁散射对GPS卫星信号影响测试及分析

Test and Analysis on Effect of High Voltage Transmission Lines Corona Radio Interference and Scattering to GPS Signal

为分析高压输电线路对邻近作业全球定位系统(GPS)接收信号的影响,从高压输电线路发出的无线电干扰和线路对GPS卫星信号的散射两方面分析了高压输电线路对GPS接收装置观测信号的影响。高压输电线路导线电晕产生无线电干扰主要集中在10MHz以下,通过比较高压输电线路带电前后的定位误差,分析了高压输电线路对GPS接收信号的影响;高压输电线路作为大型构架对GPS卫星信号产生散射,改变卫星信号的幅值、相位和路径,GPS接收装置可能产生定位误差。通过比较离开高压输电线路不同距离测点的定位误差,分析了高压输电线路对GPS接收信号的影响。在交流特高压试验线段下进行现场试验,获得了试验线段带电和不带电运行2种工况下24个测点定位数据。试验结果表明,随着测点离开试验线段0、30、60、120、180m,坐标精度没有明显降低,与距离远近和线路是否带电运行没有明显规律。高压输电线路对邻近作业的GPS接收信号没有影响。

To analyze the interference from the high voltage transmission lines to GPS signal receiving,we analyzed the interference from the high voltage transmission lines including corona radio interference and electromagnetic scattering to GPS satellite signal.The radio interference caused by high voltage transmission line wires corona is mainly below 10 MHz.The electric power fittings and insulator producto radio interference contains more than 30 MHz,due to the influence of high frequency set skin effect,pulse interference current in the conductors reduced in attenuation,so more than 30 MHz interference is considered to be the unconnected-distribution.Through the comparison of high voltage transmission line before and after a charged positioning error analysis,the influence of high voltage transmission lines on GPS receiving signals is analyzed;High voltage transmission lines as a large structure of GPS satellite signal scattering change the satellite signal amplitude,phase and path,and GPS receivers may produce positioning error.Through the field test,data received from 24 spots are tested.The test results show that,with the points test line 0 m,far from 30 m,60 m,120 m and 180 m,coordinate precision hardly changes,and no obvious rule of distance is found.GPS in high voltage transmission line erea can reduce theprotection distance of 50 m.