垂直人射HEMP近地面电磁环境特性研究

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...

Study on Environment Characteristics near the Ground of Normal Incidence High altitude Electromagnetic Pulse

High altitude electromagnetic pulse (HEMP) has the characteristics of a wide coverage and high peak field strength, which poses a serious threat to th e electronic devices. But the current HEMP standards include only the general wa ve characteristics in the free space, so the electromagnetic environmental chara cteristics near the ground induced by the double exponential HEMP incident plan e 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, wh ich so lves the introduction of stimulating source. The different incident wave statuse s and environmental factors are set and the electromagnetic environmental parame ters near the ground are simulated. Then, the propagation characteristics and tr e nds 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 d epressed, especially in the lower position over the ground,and almost integer in cid ent and reflected fields occur in the upper position. In addition, the ground el ectrical 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.