强电磁脉冲的有效带宽、测量带宽及来自上升时间的影响

High-EMP effective bandwidth, measurement bandwidth and effect from rising time

从能量分布和测量有效性的观点出发,提出了强电磁脉冲的能量有效带宽和动态范围有效带 宽的概念。针对IEC61000-4-4,MIL-STD-464,IEC61000-4-2,IEC61312-1等标准规定的核电磁脉冲 (NEMP)、雷电电磁脉冲(LEMP)、静电放电电磁脉冲(ESDEMP)等强电磁脉冲,分别计算了它们的能量有效 带宽和动态范围有效带宽。通过分析,得知在一定的范围内,上述强电磁脉冲上升时间的变化对两种有效带宽 的影响并不明显,在此基础上,确定了它们的测量带宽。计算结果为NEMP,ESDEMP及LEMP的60dB有 效带宽分别是371,786,1233MHz与96kHz;99%能量有效带宽分别是46,95,183MHz与15kHz;不失真测 量所需的带宽分别是152,307,916MHz和95kHz。

The band-widths of high-electromagnetic pulses generated by high altitude nuclear explosion, lightning and ESD have been investigated. In terms of the energy spectrums of the high-EMP and from the viewpoint of measurement validity, we have put forward two new concepts, energy effective bandwidth and dynamic range effective bandwidth, to represent the bandwidth of the high-EMP. Both of the effective bandwidthes of the high-EMP specified in IEC61000-4-4, MIL-STD-464, IEC61312-1 and IEC61000-4-2, have been calculated, 60 dB effective bandwidthes are separately 371 MHz, 786 MHz, 1233 MHz, 96 kHz and 99% energy effective bandwidthes 46 MHz, 95 MHz, 183 MHz and 15 kHz. In addition, it has been known that the rising time of above high-EMP has a little impact on the two kinds of effective bandwidth, and it is neglectable within a certain range. At last, the measurement bandwidthes of above high-EMP are given, which are separately 152 MHz, 307 MHz, 916 MHz and 95 kHz.