Abstract
A user of heterogeneous GPS and GLONASS receiver pairs in differential positioning mode will experience ambiguity fixing challenges due to the presence of inter-channel biases. These biases cannot be canceled by differencing GLONASS observations, whether pseudorange or carrier phase. Fortunately, pre-calibration of GLONASS pseudorange and carrier phase observations can make ambiguity fixing for GPS/GLONASS positioning much easier. We propose an effective algorithm that transforms an RTK (real-time kinematic) solution in a mixed receiver baseline from a float to a fixed ambiguity solution. Carrier phase and code inter-channel biases are estimated from a zero baseline. Then, GLONASS both carrier phase and code observations are corrected accordingly. The results show that a mixed baseline can be transformed from a float (~100 %) to a fixed (more than 92 %) solution.
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Acknowledgments
The first author is grateful to the scholarship provider, the Saudi Higher Education Ministry, and especially the University of Umm Al-Qura, Saudi Arabia. He is also thankful to Ultimate Positioning and Position Partners for providing receivers on loan for these investigations.
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Al-Shaery, A., Zhang, S. & Rizos, C. An enhanced calibration method of GLONASS inter-channel bias for GNSS RTK. GPS Solut 17, 165–173 (2013). https://doi.org/10.1007/s10291-012-0269-5
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DOI: https://doi.org/10.1007/s10291-012-0269-5