随着电气化铁路的迅速发展，电气化铁路电磁干扰对情报雷达的影响愈来愈引起人们的关注。但目前国内外对于该电磁干扰的来源和机理，及其对雷达的影响程度，尚没有明确的结论。文中对机车受电弓滑动离线引起的电磁干扰噪声进行数学建模，并定量分析了此噪声对情报雷达的影响。通过仿真得到了雷达接收干扰强度与雷达和铁道间距、机车速度之间的关系，给出了雷达的有效防护距离，对雷达的防护措施和雷达站的选址提出了有益的建议。

With the rapid development of electrified railway, much attention is paid to the influence of its electromagnetic interference to air surveillance radar. However, up to now, there is no conclusion about the source and the mechanism of the electromagnetic interference, as well as the extent of the influence on radar. In this paper, a mathematical model is built for electromagnetic interference caused by off-line sliding of locomotive overhead line. The interference to air surveillance radar is analyzed quantitatively. The received interference intensity of radar is obtained by simulation, versus the distance between the radar and the railway, and versus the speed of the locomotive. Meanwhile the effective radar protected distance is put forward. Some useful advice is also presented for the sake of protection and site selection of radar.

TN958