Abstract
We focus on the accuracy analysis and improvement of multi-GNSS precise point positioning (PPP) during ionospheric scintillation. By using the observation data from Hong Kong Satellite Positioning Reference Station Network (SatRef) on 18 and 19, October 2015, the performance of kinematic PPP under the ionospheric scintillation condition is analyzed. The first day corresponds to the day of year 291, which is under the non-scintillation condition (S4 < 0.2) while the second day corresponds to the day of year 292, which is under the scintillation condition (S4 > 1.0). The results show that the GPS-only kinematic PPP solution is seriously influenced when scintillation occurs while the GPS/BDS/GLONASS combined solution can present a robust solution. Statistics results show that the root-mean-square (RMS) values of the single GPS and GPS/BDS/GLONASS combined kinematic PPP solution for the day of October 18 are stable and comparable, which are better than 5 cm. However, the RMS of positioning results in single GPS kinematic PPP solution for October 19 is 0.273 m, which is much worse than that of October 18. When using GPS/BDS/GLONASS combined solution, the positioning accuracy is 0.051 m, with an improvement of 81.3% compared to the result of the GPS-only solution. This indicates that multi-GNSS is an efficient way to overcome the impact of ionospheric scintillation on positioning result.
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Acknowledgements
The study is funded by National Key Research and Development Program of China (2016YFB0501902), National Natural Science Foundation of China (41574013, 41731069, 41874032 and 41574025) and State Key Laboratory of Geo-Information Engineering(SKL-GIE2015-M-2-2). The authors would like to acknowledge the Lands Department of the Government of Hong Kong. The Hong Kong Polytechnic University is thanked for providing the ISMR data. And we would like to thank GFZ for providing precise orbit and clock products.
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Fang, Z., Nie, W., Xu, T., Liu, Z., Yu, S. (2019). Accuracy Assessment and Improvement of GNSS Precise Point Positioning Under Ionospheric Scintillation. In: Sun, J., Yang, C., Yang, Y. (eds) China Satellite Navigation Conference (CSNC) 2019 Proceedings. CSNC 2019. Lecture Notes in Electrical Engineering, vol 563. Springer, Singapore. https://doi.org/10.1007/978-981-13-7759-4_36
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DOI: https://doi.org/10.1007/978-981-13-7759-4_36
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