Nonlinear Time-Frequency Analysis of Lightning Strike Surge Current Waveforms Recorded at Gasing Hill, Kuala Lumpur

Abstract

We are investigating countermeasure technique against electromagnetic noise on telecommunication-related equipment, and we have developed a method of nonlinear time-frequency analysis for the purpose. We applied this method to the analysis of lightning strike surge current waveforms. Such waveforms produce highly nonlinear transient time series, and we have revealed their nonlinear characteristics. The relaxation process of these waveforms begins with an oscillating region with an extremely large decay rate, and is followed by a non-oscillating region with a nonlinearly increasing decay rate.