Abstract
We extend the current Undifferenced network RTK (URTK) approaches by additionally using P1/CA augmentation information from reference stations. P1/CA augmentation information can shorten the convergence time and help to fix the ionosphere-free combination ambiguities in several epochs. Instantaneous and centimeter-level positioning solutions can be achieved for rovers within the coverage of regional reference network. Also, we develop an approach for seamless transition between URTK and precise point positioning with ambiguity resolution (PPP-AR) and present a new scheme to provide URTK service. Therefore, a service for a large number of rovers can be easily realized in real-time data communication for ambiguity fixing. In addition, the period when augmentation information from a particular reference station is not available can be bridged with the help of PPP-AR. Rovers can experience more operational time with fewer interruptions, which are difficult tasks for current URTK and Network Real-Time Kinematic services. More importantly, with this new scheme, URTK and PPP-AR services can be integrated into a unique PPP-AR system. The obtained convergence time only depends on whether or not the rover is receiving the regional augmentation information.
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Acknowledgments
This work is supported by the National Natural Science Foundation of China (Grant Nos. 41304028 and 41004003), the Open Foundation of the State Key Laboratory of Geodesy and Earth’s Dynamics (Grant No. SKLGED2013-4-9-E), Specialized Research Fund for the Doctoral Program of Higher Education (SRFDP) (Grant No. 20130141120005), China 863 program (Grant Nos. 2012AA12A202 and 2014AA123101) and the 111 project (Grant No. B07037).
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Zou, X., Tang, W., Shi, C. et al. Instantaneous ambiguity resolution for URTK and its seamless transition with PPP-AR. GPS Solut 19, 559–567 (2015). https://doi.org/10.1007/s10291-014-0411-7
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DOI: https://doi.org/10.1007/s10291-014-0411-7