Volume 33 Issue 11
Nov.  2008
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XU Huajun, LIU Lintao, XU Houze, HU Xiaogang. Wavelet Approach to Study Gravity Pole Tide[J]. Geomatics and Information Science of Wuhan University, 2008, 33(11): 1114-1117.
Citation: XU Huajun, LIU Lintao, XU Houze, HU Xiaogang. Wavelet Approach to Study Gravity Pole Tide[J]. Geomatics and Information Science of Wuhan University, 2008, 33(11): 1114-1117.
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Wavelet Approach to Study Gravity Pole Tide

  • 1Institute of Geodesy and Geophysics,Chinese Academy of Sciences,340 Xudong Road,Wuhan 430077,China;2Graduate School,Chinese Academy of Sciences,19A Yuquan Road,Beijing 100039,China

Funds: 国家自然科学基金资助项目(40574009)
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  • Received Date: September 10, 2008
  • Revised Date: September 10, 2008
  • Published Date: November 04, 2008
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  • Wavelet analysis for filtering is used to improve estimation of gravity variations induced by Chandler and annual wobble.This method eliminates noise in superconducting gravimeter(SG) records with band pass filters derived from Daubechies wavelet.The SG records at Brussels are analyzed.First,the Earth tides are removed from the observed data by using synthetic tides,and then the gravity residuals are filtered into a narrow period band of 256-512 d by a wavelet band pass filter.These data are submitted to least-square method for estimating the gravimetric factor of the Chandler and annual wobble.After processed by wavelet filtering,SG records can provide amplitude factors δ and phase lags κ of the two wobbles with much smaller mean square deviation(MSD) than these provided by former studies.It is mainly because the wavelet method can effectively eliminate instrumental drift and provide smoothed data series for the regression analysis.
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