Abstract
The quality of GNSS (Global Navigation Satellite System) observation data is the primary factor affecting the accuracy of navigation satellite orbit determination, and it is an important reference for the application of observation data. Based on the GNSS observation data of iGMAS (International GNSS Monitoring & Assessment System) tracking stations, GPS, BeiDou, Galileo and GLONASS observation data quality are compared and analysed, including carrier-to-noise ratio (C/N0), multipath effect (MP) and carrier phase noise. The characteristics of BeiDou global experimental satellites (BDS-3) signal quality are studied. The differences of inter system biases (ISB) of BDS-3 and the regional BeiDou satellite navigation system (BDS-2) relative to GPS are analysed. The results show that the C/N0 of BDS-3 B1I and B3I signals are improved comparing with that of the same signals of BDS-2. The C/N0 of BDS-3 B1C and B2a signals are comparable to that of GPS and Galileo signals at the same frequency. The MP effects of BDS-3 signals do not exist the elevation-dependent systematic biases which exist in that of BDS-2 signals. The MP effects of BDS-3 B1I and B3I signals are smaller than those of the same signals of BDS-2. The MP effects of BDS-3 B1C and B2a signals are equivalent to those of GPS and Galileo signals at the same frequency. The carrier phase noise of BDS-3 B1I-B3I combination is the smallest. The carrier phase noise of BDS-3 B1C-B2a combination is smaller than that of GPS L1-L5 and Galileo E1-E5a. The daily ISB variation of BDS-3 relative to GPS is more stable than that of BDS-2 relative to GPS.
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Acknowledgments
This study is funded by the international GNSS Monitoring & Assessment System (iGMAS) data center. This work is also supported by National Science Foundation of China (41874028, 11771450).
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Zhang, H., Shao, K., Gu, D., Duan, X. (2020). Quality Analysis of Multi-GNSS Observation Data Based on IGMAS. In: Sun, J., Yang, C., Xie, J. (eds) China Satellite Navigation Conference (CSNC) 2020 Proceedings: Volume II. CSNC 2020. Lecture Notes in Electrical Engineering, vol 651. Springer, Singapore. https://doi.org/10.1007/978-981-15-3711-0_16
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DOI: https://doi.org/10.1007/978-981-15-3711-0_16
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