Optimal Choice of mother wavelet for satellite obtained Very Low Frequency radio wave feature selection

Very low frequency (VLF) radio wave signals, frequency range 2 kHz to 20 kHz play imperative role for probing of ionosphere and magnetosphere. There are three main VLF signals whistlers, chorus and hiss. They all have specific characteristics with respect time and frequency. Wavelet analysis is a widely used time-frequency analysis method. To propose a more competent analysis of the VLF signal, the wavelet analysis is deliberated. In wavelet analysis, the best mother wavelet is chosen for evaluating the signals, as many mother wavelets applied to the signal may yield diverse results. In this study, we used VLF signals obtained from the DEMETER satellite for wavelet analysis. For the “optimal" choice of the mother wavelet for such signals, we applied an energy-based quantitative approach at different frequency levels of VLF signals, which were obtained by Discrete Wavelet Transform (DWT). The results show that Haar and Bior3.5 are the optimum mother wavelets for the analysis of VLF signals.

Radio wave signals, very low frequency, Mother wavelet

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