期刊
JOURNAL OF GEODESY
卷 93, 期 7, 页码 963-976出版社
SPRINGER
DOI: 10.1007/s00190-018-1218-z
关键词
Multi-GNSS; Real-time clock estimation; Online quality control; Sequential least square adjustment
资金
- China Scholarship Council (CSC)
- Program of the National Natural Science Foundation of China [41731066, 41774025]
- Special Fund for Basic Scientific Research of Central Colleges [310826165014, 310826171004]
- Grand Projects of the Beidou-2 System [GFZX0301040308]
Real-time satellite orbit and clock product is a key prerequisite for real-time precise positioning service based on precise point positioning (PPP). With the rapid development of the multiple global navigation satellite systems (Multi-GNSS), about 120 satellites will be processed for Multi-GNSS real-time clock estimation. Unfortunately, the computation is very time-consuming, especially for quality control since problematic observations are inevitable. Taking advantage of computer technology, sequential least square adjustment with an adapted online quality control procedure is developed to rapidly estimate Multi-GNSS real-time clocks, although various filtering estimators are commonly used now. A globally distributed network including 70 stations tracking mostly satellites of GPS, GLONASS, BDS, and Galileo is employed for experimental validation. The results show that the computation time per epoch is less than 3s in average and can meet the 5s update rate of the IGS real-time clock product. Compared to the GeoForschungsZentrum MGEX (GBM) final clock product, the averaged STD values of the estimated clocks of the four GNSS systems are 0.089ns and 0.153ns, respectively, for the clock solutions with and without the online quality control, which also confirms the importance of the quality control procedure. The Multi-GNSS kinematic PPP experiment using the estimated clocks with quality control shows that the positioning RMS is about 4cm and generally 2cm in vertical and horizontal components, respectively, and the corresponding convergence time is about 15min.
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