Research On GOCE SGG Data Processing And The Space-wise Approach To Recover Gravity Field Model

This dissertation focuses on GOCE SGG data processing and the space-wise approach torecover gravity field model.With61days GOCE SGG data gravity field modelWiener₂00deg_DD2_Vxxyy and GOCE_EGM2008_Vxxyyzz are resolved upto d/o210and220. The main works are listed as follows:（1） The tidal effects among GOCE SGG data are studied. The formulaes of tidal effects ispresented. The61days GOCE SGG data correction of astronomical tides, solid earth tides, oceantides and pole tides are calculated with JPL precise ephemeris, CSR4.0ocean tides model andpolar motion data from IERS. The correction of tides in frequency domain is studied.（2） The computational formulae of GOCE attitude is presented and the attitude along theorbit is calculated. The method of outliner detection and the calibration method of systematicerrors for GOCE SGG data are presented. The outliner and systematic errors of GOCE SGG dataare calculated.（3） The errors of GOCE SGG data are studied and noise PSD is given. The ability of GOCESGG data to recover gravity field model is analysed with the noise PSD.（4） Reduction and gridding methods for GOCE SGG data are presented. The influence ofpole gaps is studied.（5） Harmonic analysis method basing on Wiener filter is studied. The influence of priorigravity field model, iteration method and combined components is researched. The optimalmethod of Wiener filter is presented.（5） Wiener filter iteration method with low degree prior model is put forward. The influenceof bandwidth, priori gravity field model accuracy and combined components is researched.Gravity field model Wiener₂00deg_DD2_Vxxyy up to d/o210is resolved with61days GOCESGG data, which has better precision than ITG2010, starting from degree/order90.（6） Merging method in frequency domain basing on FIR band-pass filter is studied. Theoptimal method of FIR band-pass filter to recover gravity field model is presented. The influenceof bandwidth, priori gravity field model accuracy and combined components is researched.Gravity field model GOCE_EGM2008_Vxxyyzz up to d/o220is resolved with61days GOCESGG data, which has better precision than go_cons_gcf_2spw_r1.