Advances in Earth Science ›› 2016, Vol. 31 ›› Issue (9): 919-925. doi: 10.11867/j.issn.1001-8166.2016.09.0919

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The Cyclic Spectrum Analysis of IMFs of EMD and Its Application to Gravity Tide

Quan Haiyan, Liu Yan   

  1. Kunming University of Science and Technology, Faculty of Information Engineering and Automation, Kunming 650500,China
  • Received:2016-06-05 Revised:2016-07-20 Online:2016-09-20 Published:2016-09-20
  • Contact: Liu Yan(1988-), female, Suzhou City, Anhui Province, Master student. Research areas include signal processing.E-mail:liuyan8785@163.com
  • About author:Quan Haiyan(1970-), male, Shiping County, Yunnan Province, Associate Professor. Research areas include signal processing, intelligent optimization algorithm.E-mail:quanhaiyan@163.com
  • 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)

Quan Haiyan, Liu Yan. The Cyclic Spectrum Analysis of IMFs of EMD and Its Application to Gravity Tide[J]. Advances in Earth Science, 2016, 31(9): 919-925.

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 M 2, the day-tide O 1, and the half-month-tide M f are extracted from the gravity tide signal, and a conclusion is drawn that the half-day-tide M 2 and the day-tide O 1 are primary components of gravity tide signal, and the half-month-tide M f is modulated in the half-day-tide M 2 and the day-tide O 1.
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