Abstract
The ionospheric delay is one of the most important error sources affecting the accuracy of Global Navigation Satellite Systems (GNSS), especially for single-frequency users. It is important to investigate various methods to mitigate the ionospheric effects on GNSS single-point single-epoch (SPSE) positioning when using single-frequency receivers. Based on the GPS data gathered at 5 International GNSS Service (IGS) stations at the mid-low latitude regions in China, we accessed the performances of different ionospheric corrections in terms of ionospheric Total Electron Content (TEC) correction accuracy and SPSE positioning during periods of high (2002) and low (2009) solar activity respectively. Meanwhile, the impacts of ionospheric corrections on GNSS positioning (especially on horizontal accuracy) were analyzed, and the relationship between TEC and positioning residual errors was also discussed. The results show that all ionospheric corrections can obviously improve the vertical accuracy, while the horizontal improvement is less than the vertical one, and even worse, the horizontal error may become larger with ionospheric corrections. Furthermore, the north error plays an important role in limiting the horizontal accuracy. If north error was not properly corrected with ionospheric models, it would worsen the horizontal positioning performance.
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Acknowledgments
This work is supported by National 973 (No. 2012CB825604) and 863 programs (No. 2012AA121803), China Natural Science Funds (No. 41231064, 41104012, 41021003), the CAS/SAFEA International Partnership Program for Creative Research Teams (KZZD-EW-TZ-05) and the Knowledge Innovation Project of the CAS (KGCXZ-EW-407-2). The authors would like to thank the IGS Global Data Center CDDIS (Crustal Dynamics Data Information System, Greenbelt, MD, USA) for granting access to dual-frequency GPS observation data used in this study. We also thank the Center for Orbit Determination in Europe (CODE, University of Berne, Switzerland) for making the daily ionospheric coefficients and monthly DCB values available online.
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Wang, N., Yuan, Y., Li, Z., Huo, X. (2013). Impact of Ionospheric Correction on Single-Frequency GNSS Positioning. In: Sun, J., Jiao, W., Wu, H., Shi, C. (eds) China Satellite Navigation Conference (CSNC) 2013 Proceedings. Lecture Notes in Electrical Engineering, vol 244. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37404-3_39
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DOI: https://doi.org/10.1007/978-3-642-37404-3_39
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