Abstract
Real-time precise point positioning (PPP) based on open-access real-time service (RTS) of the international GNSS service (IGS) has attracted increasing attention in recent years. For offshore applications, the receiving of RTS corrections becomes a major obstacle due to lack of internet-based infrastructures. Short-message communication (SMC) is a particular technique of BeiDou navigation satellite system (BDS), which can provide bidirectional communication between users in a cost-effective way. However, the limited bandwidth and frequency of BDS SMC make it impossible to directly broadcast IGS RTS corrections with BDS SMC. An offshore real-time PPP technique is proposed based on IGS RTS corrections with a single set of BDS SMC devices for communication. RTS orbit corrections in the along-track, cross-track and radial directions, the clock correction and the code bias correction of each satellite are together converted into an equivalent range correction on the basis of user approximate position and will-be-used code observation types. The range corrections within 1 min are fitted into a first-order polynomial. Only the range and range-rate corrections at the reference time are broadcast with BDS SMC. In addition, different from broadcasting corrections of all satellites in the IGS RTS, corrections of only visible satellites are encoded into a BDS SMC correction message to further reduce the data size. The encoding strategy of BDS SMC correction message and a detailed procedure of the offshore real-time PPP technique are presented. The land-simulated and offshore experiment results show that the proposed technique can meet the demands of high-precision offshore applications.
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Data availability
The datasets analyzed in this study are managed by the College of Oceanography and Space Informatics, China University of Petroleum, Qingdao, China, and can be made available by the corresponding author on request.
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Acknowledgements
This study was funded by the National Key Research and Development Program of China (Nos. 2016YFB0501700, 2016YFB0501705), China Postdoctoral Science Foundation (No. 2020M672168), Qingdao National Laboratory for Marine Science and Technology (No. QNLM2016ORP0401) and Qingdao Postdoctoral Application Research Project (No. QDYY20190077). CNES is acknowledged for providing RTS service. Thanks to Mr. Rui Shan from Qingdao Institute of Marine Geology, China Geological Survey, for his help in the offshore experiment. We would also like to appreciate the editor and all anonymous reviewers for their comments, which helped to improve this paper significantly.
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ZN designed the research, processed data and prepared the paper draft; BW performed the experiments, analyzed the experimental results and wrote result part of the paper; KH checked the software and validated the processing results; and ZW supervised the research and revised the paper.
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Nie, Z., Wang, B., Wang, Z. et al. An offshore real-time precise point positioning technique based on a single set of BeiDou short-message communication devices. J Geod 94, 78 (2020). https://doi.org/10.1007/s00190-020-01411-6
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DOI: https://doi.org/10.1007/s00190-020-01411-6