Noise Reduction of Lightning Electric Fields Measurements Using Filtering in the Fractional Fourier Domain
Lightning electric field measurements are degraded by the presence of noise.In fact, during the measure of lightning electromagnetic pulses (LEMP), the electromagnetic environment and the measuring systems composed by analogdigital converters (ADC), coupling system and electronic circuits, inevitably introduce noise in the measured signals.In recent years, several activities has been developed by EMCUNC group to measure, study and classify the parameters of lightning electric fields (LEF) in Bogotá, Colombia.However, the obtained measurements are distorted by significant noise levels.This paper shows the results of the first approach to apply the fractional Fourier transform as an alternative technique to reduce the presence of noise in a set of electric field signatures and presents the basic conditions to realize the filtering process in the fractional Fourier domain.Afterwards, some lightning electric field temporal characteristics were analyzed by using the processed signatures.Important differences between the processed and the original waveforms were observed.
H. E. Rojas C.A. Cortés F. Santamaría
Electromagnetic Compatibility Research Group EMC-UNC,Universidad Nacional de ColombiaCiudad Universi Electromagnetic Compatibility Group GCEM,Universidad Distrital Francisco José de Caldas Bogotá,Colom
国际会议
成都
英文
1-9
2011-11-01（万方平台首次上网日期，不代表论文的发表时间）