电分相电弧对全向信标电磁辐射特性的分析

为了分析电气化铁路高速列车电分相电弧对机场全向信标（VOR）的影响，研究其电磁发射特性。利用电磁干扰接收机与频谱仪，分别以点频和扫频方式，对电气化铁路电分相点和普通点进行了大量辐射测试。分析测试数据的异方差性，改进回归分析方法，拟合出电弧在全向信标频段的幅频特性曲线，分析弓网电弧电磁辐射对机场全向信标的影响。结果表明：电分相电磁辐射是随机的，在电分相处比普通点大；现代电气化铁路高速列车经过电分相的测试数据异方差性比较明显，普通的最小二乘估计方法不适用；当电气化铁路电分相点与飞机距离小于4.944 km时，可能会对VOR信号产生影响。

Characteristics analysis of electromagnetic emission on VOR caused by neutral section arcs

To analyze the influence of electrified railway high-speed train arcs on the airport Very high frequency Omnidirectional Range (VOR), the electromagnetic emission characteristics of the arcs are studied. The electromagnetic interference receiver and the spectrum analyzer are used to measure the typical locations of electrified railways (neutral section points and common points) by means of point frequency and sweep frequency respectively. The heteroscedasticity of the test data is analyzed and the regression analysis method improved. The amplitude-frequency characteristic curve of the arcs in the omnidirectional beacon frequency band is fitted, with the influence of arc electromagnetic radiation on the omnidirectional beacon of the airport analyzed. The results show that: the electromagnetic radiation of the arc has a certain random characteristic; the maximum field strength is at the neutral section point, larger than that at the normal points; in modern electrified railways, the heteroscedasticity of the test data of the neutral section is more distinct, and the ordinary least squares estimation method is not applicable; when the electrified railway electrical phase separation point is within the distance of 4.944 km to the aircraft, it may affect the VOR signals.