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《Chinese Journal of Geophysics》 2013-01
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The application of Bayesian method in determination of free core nutation parameters

CUI Xiao-Ming1,2,SUN He-Ping1,S Rosat3,XU Jian-Qiao1,ZHOU Jiang-Cun1,CHEN Xiao-Dong1 1 State Key Laboratory of Geodesy and Earth's Dynamics,Institute of Geodesy and Geophysics,CAS,Wuhan 430077,China 2 University of Chinese Academy of Sciences,Beijing 100049,China 3 Institut de Physique du Globe de Strasbourg,Strasbourg 67084,France  
The difficulty in the determination of Free Core Nutation(FCN) parameters(period and quality factor) using high precision gravity technique is due to the low signal-to-noise ratio of observations,which affects the determination precision when using traditional least square method.In this paper,we use Bayesian method to fitting the FCN parameters with the help of gravity data observed by superconducting gravimeters in Wuhan and Global stations.The difference using observations from different stations is investigated by comparing the Bayesian method and least square method.We also discussed the influence on FCN determination of choosing different tidal wave and ocean tidal models.The results indicate that Bayesian method is more credible and the FCN quality factor obtained by Bayesian method has a better agreement with that from VLBI observations,which could offer effective reference for further studies of the deep interior of the Earth.
【Fund】: 国家自然科学基金项目(41021003 41074053和41274085);; 中国科学院创新团队国际合作计划(KZZD-EW-TZ-05)联合资助
【CateGory Index】: P223
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