Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997kfnt...13f..81k&link_type=abstract
Kinematika Fiz. Nebesn. Tel, Tom 13, No. 6, p. 81 - 93
Physics
Numerical Methods: Time Series
Scientific paper
The author presents the method of a quasi-periodic signal analysis for uniform time series applying Fourier-transform with the gliding rectangular window. The signal should satisfy certain conditions. The accuracy of a signal amplitude estimation is defined. The author considers the method of more precise definition of the signal frequency and amplitude if unknown frequency is different from node frequencies of Fourier-transform on the time interval separated by rectangular window. Parameters of functional dependence of the signal frequency on the time have been determined from a time-frequency diagram by the least square method. Numerical simulation shows that the accuracy of determination of searched values depends on the choice of the rectangular window width. A modification of the method is proposed in case of possible deviations from the accepted model of the quasi-periodic signal.
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