Review and Prospect for the Earth Gravity Field Determination with Gravity Satellites in the Past Five Years
Received date: 2006-02-10
Revised date: 2006-04-29
Online published: 2006-07-15
The technical behaviors and preliminary results in the global gravity field determination obtained from the gravity satellites CHAMP, GRACE and GOCE which will be launch in the near future, are reviewed, compared and summarized. The possible development for the construction of static and kinematic global gravity model based on the observation data of these gravity satellites are also given in the paper. A CHAMP only global gravity field model derived from 33 months of mission data is much better than GRIM5-S1, which was derived from the pre-CHAMP multi- satellite data. The resolution for the result derived from GRACE 110days data is better than that derived from CHAMP mission data mentioned above. There is another task for the GRACE mission, i.e., to determine the real or near real time non tidal variation in the global gravity field. A new combined earth gravity model EIGEN-CG03C, 360 order and degree, 30’ resolution is introduced in the paper. In comparison with the former earth gravity model the accuracy of CG03C is improved by one magnitude in the 400 m wave length, that of geoid is improved by 3 cm, and that of surface gravity anomaly is improved by 0.4 mgal.
Key words： Gravity satellite; CHAMP; GRACE; GOCE; Earth gravity field.
Chen Junyong . Review and Prospect for the Earth Gravity Field Determination with Gravity Satellites in the Past Five Years[J]. Advances in Earth Science, 2006 , 21(7) : 661 -666 . DOI: 10.11867/j.issn.1001-8166.2006.07.0661
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