水平极化电磁脉冲模拟器空间场的数值模拟
Numerical simulation of space-time distribution of field of horizontally polarized electromagnetic pulse simulators
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摘要: 采用时域有限差分方法，对水平极化电磁脉冲模拟器所产生的电磁场进行数值模拟，在时域中计算了电磁场的时间空间分布。讨论了电磁脉冲模拟器产生的电磁脉冲波形和场的空间变化、均匀性等重要因素。结果表明，模拟器产生的电磁脉冲前沿为10ns，接近脉冲电压前沿，波形与脉冲电压波形（双指数波）相差较大；峰值场强在对称轴上并非与距离成反比，而是随距离增大而迅速减弱；该模拟器的双锥笼形天线能在大范围内（大于等于50m,水平方向）产生均匀分布、高峰值场强、快前沿的电磁脉冲。Abstract: The finite-difference time-domain method is used to numerically simulate electromagnetic field distribution of horizontally-polarized electromagnetic pulse simulators. Some important factors representative of simulator performance such as waveform, spatial variation and uniformity are studied. The rise time of EMP generated by the simulator is 10ns, approximately the same as the rise time of voltage source. Waveform of EMP is greatly different from that of the voltage pulse. Electric field attenuates rapidly along the horizonal axis. This kind of antenna can generate uniformly distributed EMP with high electric field strength and short rise time in a large area(≥50m,horizontal directions)．
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