摘要
高空核爆电磁脉冲(HEMP)具有覆盖范围广、峰值场强高等特点,对电子设备构成严重威胁。针对有关HEMP标准中主要涉及自由空间HEMP波形描述的情况,研究了双指数HEMP平面波垂直入射地面时,地面附近的电磁脉冲环境特性。基于时域有限差分(FDTD)法提出使用一维合成平面波解决总场空间激励源的引入问题。通过设置不同的入射波状态和环境因素,仿真计算了HEMP在地面附近的电磁脉冲环境参数,并对HEMP在地面附近的传播特点与规律进行了总结和归纳。结果表明,较低位置处反射场削弱了部分入射场,使总场幅度降低;较高位置处经历较为完整的入射场和反射场的冲击;地表介质的电气参数对总场也有影响,其中电导率的影响较大。这些结论有利于指导地面附近电子设备的防护设计。
High-altitude electromagnetic pulse (HEMP) has the characteristics of a wide coverage and high peak field strength, which poses a serious threat to the electronic devices. But the current HEMP standards include only the general wave characteristics in the free space, so the electromagnetic environmental characteristics near the ground induced by the double-exponential HEMP incident plane wave perpendicular to the ground are studied in this paper. Based on the finite difference time domain(FDTD) method, the 1 - D compound plane wave is proposed, which solves the introduction of stimulating source. The different incident wave statuses and environmental factors are set and the electromagnetic environmental parameters near the ground are simulated. Then, the propagation characteristics and trends of the HEMP near the ground are summarized and concluded. The results show that the reflected field weakens the incident one, which makes the total field depressed, especially in the lower position over the ground, and almost integer incident and reflected fields occur in the upper position. In addition, the ground electrical parameters .also affect the total field near the ground, especially the conductivity. The conclusions are helpful to provide guidance for the protection design of electronic devices near the ground.
出处
《电讯技术》
北大核心
2011年第1期98-103,共6页
Telecommunication Engineering
关键词
高空核爆电磁脉冲
地面
电磁脉冲环境
时域有限差分法
电子设备
防护设计
high-altitude electromagnetic pulse(HEMP)
ground plane
environment of electromagnetic pulse
finite difference time domain(FDTD) method
electronic device
protection design