Taking China as the region for test, the potential of the new satellite gravity technique, satelliteto-satellite tracking for improving the accuracy of regional gravity field model is studied. With WDM94 as referenee,...Taking China as the region for test, the potential of the new satellite gravity technique, satelliteto-satellite tracking for improving the accuracy of regional gravity field model is studied. With WDM94 as referenee, the gravity anomaly residuals of three models, the latest two GRACE global gravity field model （EIGEN_GRACE02S, GGM02S） and EGM96, are computed and compared. The causes for the differences among the residuals of the three models are discussed. The comparison between the residuals shows that in the selected region, EIGEN_GRACE02S or GGM02S is better than EGM96 in lower degree part （less than 110 degree）. Additionally, through the analysis of the model gravity anomaly residuals, it is found that some systematic errors with periodical properties exist in the higher degree part of EIGEN and GGM models, the results can also be taken as references in the validation of the SST gravity data.展开更多
基金Project supported by the National Natural Science Foundation of China (No.40374006 No.40574005 +1 种基金 No.40304001 No.40234039) .
文摘Taking China as the region for test, the potential of the new satellite gravity technique, satelliteto-satellite tracking for improving the accuracy of regional gravity field model is studied. With WDM94 as referenee, the gravity anomaly residuals of three models, the latest two GRACE global gravity field model （EIGEN_GRACE02S, GGM02S） and EGM96, are computed and compared. The causes for the differences among the residuals of the three models are discussed. The comparison between the residuals shows that in the selected region, EIGEN_GRACE02S or GGM02S is better than EGM96 in lower degree part （less than 110 degree）. Additionally, through the analysis of the model gravity anomaly residuals, it is found that some systematic errors with periodical properties exist in the higher degree part of EIGEN and GGM models, the results can also be taken as references in the validation of the SST gravity data.
