地球科学进展 ›› 2016, Vol. 31 ›› Issue (9): 919 -925. doi: 10.11867/j.issn.1001-8166.2016.09.0919

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EMD模态分量的谱相关分析法及其对重力固体潮信号的解调分析
全海燕, 刘艳 *   
  1. 昆明理工大学信息工程与自动化学院, 云南 昆明 650500
  • 收稿日期:2016-06-05 修回日期:2016-07-20 出版日期:2016-09-20
  • 通讯作者: 刘艳(1988-),女,安徽宿州人,硕士研究生,主要从事信号处理研究.E-mail:liuyan8785@163.com
  • 基金资助:
    国家自然科学基金项目“提取重力固体潮信号中地球物理信息和地震前兆信息的关键信号处理算法研究”(编号:41364002)资助

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)
EMD方法分解得到的模态信号分量一般为调频调幅波。提出利用循环相关谱对EMD分解的模态分量进行解调,以分解出模态分量中的载波成分和被调制成分,从而实现对信号的加性分解和乘性解调,揭示信号中各成分分量的物理意义。在应用实验中,将该方法用于重力固体潮信号分析,完整提取出半日波分量、日波分量和半月波分量,并揭示出:在重力固体潮信号中,日波和半日波是加性叠加关系,半月波以乘性调制方式被同时调制到半日波分量和日波分量中,而且,它们之间的调制方式为抑制载波调制方式。
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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