The impact analysis of corrections to GOCE satellite gravity gradient observations by accounting for temporal gravity field variations

• Main Authors: CHEN Jianhua, ZHANG Xingfu, SHEN Yunzhong, CHEN Qiujie, LI Weichao
• Format: Article
• Language: zho
• Published: Surveying and Mapping Press 2021-03-01
• Series: Acta Geodaetica et Cartographica Sinica
• Subjects: goce satellite; gravity gradient; corrections of temporal gravity field variations; gravity field recovery
• Online Access: http://xb.sinomaps.com/article/2021/1001-1595/2021-3-324.htm

As an important data source for high-degree static gravity field recovery, the gravity gradient observations from GOCE satellite should be processed prior to gravity field estimation by removing the temporal gravity field variations. In this study, the data processing method to account for the temporal gravity field variations in GOCE gradiometric data is discussed, to better remove the influence of temporal gravity field variations, the standard and background models from ESA are updated. Consequently, high-degree static gravity field models can be directly determined from the self-processed GOCE Level 1b data. To discuss the impacts of temporal gravity field variations on high-degree static gravity field modelling, we design three different data processing schemes to remove the temporal gravity field variations. Our results show that the temporal gravity field variations have an effect on deriving high-degree gravity field models, with a maximum geoid height difference of above 1 cm over some particular regions. Therefore, during deriving high-degree static gravity field solution from GOCE data, we suggest that updating standard and background models are better to mitigate the effect of temporal gravity field variations.