高速动车组弓网离线放电电磁干扰对L波段雷达的影响分析

Research on the Influence of Electromagnetic Interference(EMI) of High Speed Railway(HSR) on L-Band Air Surveillance Radar

随着我国高速铁路的迅速发展,高速铁路电磁干扰对沿线电子设备的影响愈来愈引起人们的关注。目前国内相关高校及科研院所对于该电磁干扰的来源和机理已做了较为深入的研究,得出了一些很有价值的理论成果,但其对雷达的影响程度,尚没有明确的结论。研究通过前期的大量测试数据对列车弓网离线引起的电磁干扰、电磁干扰强度与车速的关系进行统计分析及数学建模,现场测试数据定量分析了此噪声对L波段雷达的影响。通过计算得到了在平原地区条件下(干扰源与受扰雷达之间的电磁波传播路径上无遮挡物,仅存在地面反射),干扰强度与雷达和铁道间距、列车速度之间的关系,得出了雷达的有效防护距离。

With the rapid development of HSR, much attention is paid to the influence of its EMI on theelectronic equipment along the railway line. Up to now, there are deep researches on the source and the mechanism of the EMI by some universities and aeademes, and a lot of valuable theoretical results are obtained, however, there is no conclusion about the extent of the influence on radar. In this paper, a statistic analysis is done and a mathematical model is built for EMI caused by pantograph-offline discharge and the relationship between EMI intensity and Electric Multiple Unit （EMU） speed based on a large number of test data. The EMI on air surveillance radar is analyzed quantitatively. The received interference intensity of radar is obtained by calculation ofthe distance between the radar and the railway, and the speed of the EMU. Meanwhile, the effective radar protected distance is put forward on the condition of LOS.