Analysis of gravity earth tide signals based on spectral correlation method
YI Xinbao1,2， WEI Wei1， QUAN Haiyan1
1.Faculty of Information and Automation， Kunming University of Science and Technology， Kunming 650500， China；2.Xishuangbanna Vocational Technical College Teachers College (Public Section)， Xishuangbanna， Yunnan 666100， China
Abstract：In order to extract the harmonic components whose energy varies greatly among the harmonic components of gravity solid tidal signals， this paper uses independent component analysis to realize the additive decomposition of gravity solid tidal signals， and then uses spectral correlation analysis to analyze the spectral correlation characteristics of independent components. The modulation relationship between the harmonics is revealed. At the same time， through the analysis of the autocorrelation spectrum and the correlation spectrum between independent components， it is demonstrated that in the autocorrelation spectrum， the high-energy harmonic component is highlighted， and the low-energy harmonic component is suppressed， and in the cross-spectrum， Harmonic components with less energy can be better highlighted. The results show that the cross-spectrum can reveal the weak tidal harmonic component and its modulation relationship in gravity solid tidal signal.
2019, Vol. 53 
