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《Science of Surveying and Mapping》 2019-01
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Independent component analysis of gravity earth tide signals and cyclic spectrum

GAO Lue;QUAN Haiyan;Faculty of Information Engineering and Automation,Kunming University of Science and Technology;  
According to the problems of extracting the tidal harmonic components of gravity tide,and analyzing the relationship between the harmonic components,in this paper,an orthogonal decomposition model of gravity tidal signals was established.On this basis,Independent component signals corresponding to the model were separated by independent component analysis(ICA)algorithm.Because the independent component signal is the FM-AM components,by the cyclic spectrum analysis,the carrier component and the modulated component were obtained,and the multiplicative demodulation of the signal is realized.By using this method,the relation between the independent components of gravity tide signal and the gravity tide effects from the orbit position change of earth,moon and sun was described.The result showed that abundant tidal harmonic information could be extracted from gravity tide signal,and there were three independent components of linear superposition in gravity tide signal,and wave month and wave year were modulated in the diurnal waves and semidiurnal waves.
【Fund】: 国家自然科学基金项目(41364002)
【CateGory Index】: P312.4
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