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??????????????????о????????????????????????????????????????????????????????????????С????????????????????????????????????????????????????ξ????????η??????????????????????FFT?????????????????????????????????????????????????????????????????????????????????????????????????????????????????б??????????????±5.231 58 mGal???????????????????EGM96??EGM2008???????????б?????????????????±0.694 57 m??±0.029 51 m??

Inversion of Marine Gravity Anomalies and Geoid Using Multi-Satellite Altimeter Data

Multi-satellite altimeter data were used to study and the method of combined crossover adjustment was completed.Systematic bias might be reduced with the method.The meridional component and prime vertical component of the residual vertical deflections of Zhejiang offshore were determined using the weighted method of along track least squares with an appropriate search radius.On the basis of remove restore method and FFT technology，the gravity anomaly model and geoid model gridded with a spatial resolution of 2.5′ of Zhejiang offshore were determined using the residual vertical deflections with an appropriate integration radius，under the consideration of effects of innermost zone.The gravity anomaly computed by the method was compared with the shipborne gravity，the RMS of the difference is ±5.231 58 mGal.The marine geoid was compared with the  results calculated with  EGM96 and EGM2008，the RMS of the difference is ±0.694 57 m and ±0.029 51 m.