A discrimination algorithm of nuclear electromagnetic pulse based on characteristic parameters in time domain

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (8) : 159-164.

WANG Tao1,CHEN Fugui2,LIU Ming2,SHI Xiaolei2,CHEN Weihui2,ZHU Wanhua1,HUANG Ling1,FANG Guangyou1

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Abstract

Abstract:In order to discriminate nuclear electromagnetic pulse (NEMP) and lightning electromagnetic pulse (LEMP), an automatic time-domain algorithm at a range of 500 km was proposed.First, for time series of multiple stations emitted by identical source, a method combined of threshold triggering and correlation operation was developed to choose start time of each series.In addition, end time was located according to the height of reflecting layer in the ionosphere, which was estimated through the time difference of direct wave and reflected wave at about 1 000 km distance.Then four parameters were defined to character waveforms.By fitting statistics result with proper probability density function, the four parameters’ distribution of LEMP was drawn.Contrasting the distribution with parameters calculated from NEMP data, finally, a discrimination algorithm was obtained.A test was performed to verify the algorithm, which can identify NEMP data and more than 99% of LEMP data at a range of 500 km.

Key words

time domain waveform / feature distribution / nuclear electromagnetic (NEMP) / lightning electromagnetic pulse (LEMP) / near field discrimination

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WANG Tao1,CHEN Fugui2,LIU Ming2,SHI Xiaolei2,CHEN Weihui2,ZHU Wanhua1,HUANG Ling1,FANG Guangyou1. A discrimination algorithm of nuclear electromagnetic pulse based on characteristic parameters in time domain[J]. Journal of Vibration and Shock, 2020, 39(8): 159-164

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