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固体潮时频分析新方法
A New Approach of Earth Tides Time-Frequency Analysis
【摘要】 对传统时频分析方法的特点和局限性作了介绍。采用Huang-H ilbert Transform ation方法分析了固体潮数据,即利用经验模态分解,将复杂信号分解成有限个本征模态函数之和,求取三维时频空间的H ilbert谱。仿真实验和重力固体潮实例分析表明,该方法适用于调频调幅信号特征的提取。
【Abstract】 On the basis of analyzing the feature and limits of the conventional time-frequency analysis methods,we use Huang-Hilbert Transformation(HHT) to analyze solid tide data,i.e.,use empirical mode decomposition to decompose complicated signal into the sum of finite intrinsic mode functions,and construct a 3D energy-frequency-time Hibert spectra of the data.The emulational signals and the gravity tide signal are analyzed using the HHT method,which turns out that the method is suited for the analysis of AM-FM signal.
【关键词】 固体潮;
非线性非平稳信号;
时频分析;
HHT;
经验模态分解;
Hilbert变换;
【Key words】 solid tide; nonlinear and nonstationary signal; time-frequency analysis; HHT; empirical mode decomposition; Hilbert transformation;
【Key words】 solid tide; nonlinear and nonstationary signal; time-frequency analysis; HHT; empirical mode decomposition; Hilbert transformation;
【基金】 云南省自然科学基金项目(2003D0084M)
- 【文献出处】 地震研究 ,Journal of Seismological Research , 编辑部邮箱 ,2005年04期
- 【分类号】TN911.6;
- 【被引频次】16
- 【下载频次】152