The Cyclic Spectrum Analysis of IMFs of EMD and Its Application to Gravity Tide
First author:Quan Haiyan(1970-), male, Shiping County, Yunnan Province, Associate Professor. Research areas include signal processing, intelligent optimization algorithm.E-mail:quanhaiyan@163.com
Corresponding author:Liu Yan(1988-), female, Suzhou City, Anhui Province, Master student. Research areas include signal processing.E-mail:liuyan8785@163.com
Received date: 2016-06-05
Revised date: 2016-07-20
Online published: 2016-09-20
Supported by
Project supported by the National Natural Science Foundation of China“Research of algorithms of extracting both the geophysical information and the seismic precursory information from Gavity Tide” (No.41364002)
Copyright
IMFs sifted out by EMD are the FM-AM components. In the paper, by the cyclic spectrum analysis, IMFs are demodulated as the two periodic components which are identical to the intrinsic physical concepts. Using the method, the half-day-tide M2, the day-tide O1, and the half-month-tide Mf are extracted from the gravity tide signal, and a conclusion is drawn that the half-day-tide M2 and the day-tide O1 are primary components of gravity tide signal, and the half-month-tide Mf is modulated in the half-day-tide M2 and the day-tide O1.
Key words： EMD; Cyclic spectrum; Demodulation; Gravity tide.
Haiyan Quan , Yan Liu . The Cyclic Spectrum Analysis of IMFs of EMD and Its Application to Gravity Tide[J]. Advances in Earth Science, 2016 , 31(9) : 919 -925 . DOI: 10.11867/j.issn.1001-8166.2016.09.0919
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