Comparison of Present SST Gravity Field Models

With Europe main land as the region in study,the potential of the new satellite gravity technology,satellite-to-satellite tracking,to improve the precision of regional gravity field model of the SST models is investigated.The deficiencies of these models are discussed.With GPM98C as the reference,the gravity anomaly residuals of several other models,the latest SST global gravity field models(EIGEN and GGM),are computed and compared.The results of the comparison show that in the selected region,some systematic errors with periodical properties exist in the EIGEN and GGM's S serial models in the high degree and order.Some information that is not shown in the classic gravity models is detected in the low and middle degree and order of EIGEN and GGM's S serial models.