现有SST重力场模型的比较研究

Comparison of Present SST Gravity Field Models

分析了最新的卫星跟踪卫星(satellite-to-satellite tracking,SST)地球重力场模型EIGEN系列和GGM系列在欧洲大陆部分与GPM98C模型重力场异常残差的差异,研究了新一代卫星重力方法对于提高区域重力场模型精度的潜力以及存在的问题。比较结果说明,SST重力场模型的较高阶部分精度不理想,而在中低阶部分,SST模型表现出在原有经典重力场模型中并未包含的信息。

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.