Improved gravity field estimation by incorporating the Tiangong Space Station and next-generation CAI satellite gravity mission  

作　　者：Renjie Zhao Qiujie Chen Xingfu Zhang 

机构地区：[1]College of Surveying and Geo-informatics,Tongji University,Shanghai 200092,China [2]Departments of Surveying and Mapping,Guangdong University of Technology,Guangzhou 510006,China

出　　处：《Geodesy and Geodynamics》2025年第2期183-192,共10页大地测量与地球动力学(英文版)

基　　金：National Key R&D Program of China(2021YFB3900101);the National Natural Science Foundation of China(42174099 and 42192532);It is also partly supported by the Fundamental Research Funds for the Central Universities.

摘　　要：The next-generation gravity satellite mission equipped with the Cold Atom Interferometry(CAl)gradiometer has great potential for the Earth's gravity field estimation.Deploying a CAI gradiometer on the Chinese Tiangong Space Station launched for long-term Earth science research not only reduces the cost compared to a dual-satellite constellation but also enhances interdisciplinary collaboration in the Earth's gravity field detection.In this study,we conducted gravity gradient-based simulations to assess the contribution of deploying a CAI gradiometer on the Tiangong Space Station to collaboratively observe the Earth's gravity field with a polar-orbit gravity satellite.The simulation results demonstrate that whether utilizing V_(yy) component,three diagonal components or full components,the derived gravity field models show significant improvements within 100 degree and above 200 degree after incorporating Tiangong Space Station.In particular,the gravity field solution recovered from three diagonal components achieves the best accuracy.In the case of using diagonal components,the collaboration observation scheme effectively reduced the cumulative geoid height error by approximately 5.3 cm(300 d/o).In the spatial domain,the incorporation of the Tiangong Space Station primarily impacts the estimated gravity field within the orbital coverage area of the space station,and this effect is particularly pronounced when just employing V_(yy) component.However,due to the limitation of angular velocity observation inaccuracy associated with the CAl gradiometer in nadir mode,there is no substantial accuracy improvement observed above 200 degree when adding gradient components.

关 键 词：Satellite gravimetry CAl gradiometer Tiangong space station Gravity gradients simulation 

分 类 号：P223[天文地球—大地测量学与测量工程]