Detecting groups of equidistant frequencies in spectra of geomagnetic pulsations
Автор: Polyakov A.R.
Журнал: Солнечно-земная физика @solnechno-zemnaya-fizika
Статья в выпуске: 4 т.4, 2018 года.
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This paper presents a revised version of the new signal processing method based on the analysis of a specially constructed correlation function of amplitude and phase fluctuations (APCF). This method allows us to detect the presence of a group of equidistant frequencies in the spectrum of the original signal and to measure the difference of two adjacent frequencies Δ f in such a group. The end product of the processing is a histogram of a set of Δ f. The effect of noise that may be present in the original signal has been examined. It has been shown that even with a very high level of noise when its component in the spectrum completely absorbs and masks spectral peaks of equidistant frequencies of the desired signal, the APCF method copes with the problem of detecting these frequencies. This method was first applied to processing of natural signals, for which recordings of geomagnetic field disturbances of an ultralow frequency (ULF) range were used. The comparison of one of the histograms with the traditional spectrum indicates that the chaotic spectrum, which has always been considered to be a noise spectrum, actually has a strictly ordered structure...
Signal processing technique, correlation functions, eigenfrequencies
Короткий адрес: https://sciup.org/142220308
IDR: 142220308 | DOI: 10.12737/szf-44201805