用正弦信号源研究电气化铁道无线电干扰的横向电波传播特性

提出了一种新的研究电气化铁道无线电干扰电波传播规律的测量方法.此方法从干扰源处——接触网与受电弓之间馈入高频信号,由电气化铁道系统辐射出去进行测量.测量时,整个辐射系统与列车运行时射频干扰源的辐射系统相比没有变化,电波传播规律也保持不变。信号源的信号强度比较强,且是稳定信号,可以在较远的距离范围内对辐射场强分布进行测量,且可对其传播规律做详细的研究.解决了过去测量中的困难.建立了电波传播的非线性拟合模型,可以将近场、远场统一考虑回归,可更加良好地反映电气化铁道无线电干扰电波传播的规律.

Study on Crosswise Propagation Characteristics of Radiated Radio Noise Caused by AC Electrified Railways by Means of a Sinusoidal Signal Generator

The authors of this paper has put forward a new measurement method to study propagation characteristics of radio noise caused by electrified railways. According to the measurement method,feeding a RF sinusoidal signal at location of interference source,so this signal is radiated by electrified railway system. In this condition,the radiated system and the electromagnetic wave propagation are same as that the train pass through.The signal is stronger than interference and stable,so measurement may be done at farther distance in detail.Defficulties in the past can be solved.The authors have formed the nonlinear regression model of propagation characteristics of radio noise caused by electrified railway,both of near field and far field are considered.It is better to reflect the law of prop- agation of rediated radio noise caused by AC electrified railways.