A review of real-time multi-GNSS precise orbit determination based on the filter method  

作　　者：Yidong Lou Xiaolei Dai Xiaopeng Gong Chenglong Li Yun Qing Yang Liu Yaquan Peng Shengfeng Gu 

机构地区：[1]GNSS Research Center,Wuhan University,129 Luoyu Road,Wuhan,Hubei,China [2]Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration,Wuhan,430071,China [3]First Institute of Oceanography,Ministry of Natural Resources,Qingdao,266061,China

出　　处：《Satellite Navigation》2022年第3期1-15,I0002,共16页卫星导航（英文）

基　　金：National Natural Science Foundation of China(Grand No.41904021).

摘　　要：Stable and reliable high-precision satellite orbit products are the prerequisites for the positioning services with high performance.In general,the positioning accuracy depends strongly on the quality of satellite orbit and clock products,especially for absolute positioning modes,such as Precise Point Positioning(PPP).With the development of real-time services,real-time Precise Orbit Determination(POD)is indispensable and mainly includes two methods:the ultra-rapid orbit prediction and the real-time filtering orbit determination.The real-time filtering method has a great potential to obtain more stable and reliable products than the ultra-rapid orbit prediction method and thus has attracted increasing attention in commercial companies and research institutes.However,several key issues should be resolved,including the refinement of satellite dynamic stochastic models,adaptive filtering for irregular satellite motions,rapid convergence,and real-time Ambiguity Resolution(AR).This paper reviews and summarizes the current research progress in real-time filtering POD with a focus on the aforementioned issues.In addition,the real-time filtering orbit determination software developed by our group is introduced,and some of the latest results are evaluated.The Three-Dimensional(3D)real-time orbit accuracy of GPS and Galileo satellites is better than 5 cm with AR.In terms of the convergence time and accuracy of kinematic PPP AR,the better performance of the filter orbit products is validated compared to the ultra-rapid orbit products.

关 键 词：Multi-GNSS Real-time precise orbit determination Square root information filter Ambiguity resolution 

分 类 号：V47[航空宇航科学与技术—飞行器设计]