Abstract
GLONASS clock offset estimation is affected by the inter-channel biases (ICBs) caused by frequency division multiple access technique. The effect of ICBs on joint GPS/GLONASS clock offset estimation is analyzed. An efficient approach for joint estimation of GPS/GLONASS satellite clock offset is applied to the generation of 30-s clock offset products. During the estimation, the following three ICB handling strategies were tested: calculating ICBs for each GLONASS signal channel, calculating ICBs for each GLONASS satellite and neglecting ICBs. The behavior of ICBs under different strategies was statistically stable. Subsequently, the clock offset products using different ICB strategies were evaluated. The evaluation shows that consideration of the ICB is important when estimating the clock offset. Furthermore, estimating one ICB for each GLONASS satellite is better than estimating one for each GLONASS signal channel because, with the former strategy, the clock offset products behave more smoothly and have higher accuracy compared with products from the International GNSS Service Analysis Center. In addition, precise point positioning, using clock offsets based on one ICB for each GLONASS satellite, has the highest positioning accuracy.
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Acknowledgements
This work was partially supported by the Collaborative Precision Positioning Project funded by the Ministry of Science and Technology of the People’s Republic of China, the China Natural Science Funds (NSFC) (Nos. 41231014, 41574033 and 41621091), the National “973 Program” of China (No. 2012CB825604), and the NSFC (No. 41404017). The authors would like to extend their sincere gratitude to iGMAS for providing observation data. We also acknowledge the funding support provided by the State Key Laboratory of Geodesy and Earth’s Dynamics (Institute of Geodesy and Geophysics, CAS) (No. SKLGED2014-3-1-E).
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Chen, Y., Yuan, Y., Ding, W. et al. GLONASS pseudorange inter-channel biases considerations when jointly estimating GPS and GLONASS clock offset. GPS Solut 21, 1525–1533 (2017). https://doi.org/10.1007/s10291-017-0630-9
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DOI: https://doi.org/10.1007/s10291-017-0630-9