Abstract
Based on a global GNSS tracking network, the B1I/B3I ionospheric-free phase center offsets (PCOs) are estimated for BeiDou Inclined Geosynchronous Orbit (IGSO) and Medium Earth Orbit (MEO) satellites. Peak-to-peak variations of up to several decimeters or even meters that depend on the solar radiation pressure (SRP) model and the sun elevation angle above the orbital plane (β angle) are found in the daily x-offset estimates. Different SRP modeling has a negligible effect on the y-offset estimation, but the scatter of y-offset estimates depends on the β angle. The z-offset estimates do neither exhibit a dependence on the SRP model nor the β angle, but they have a larger scatter than x-offset and y-offset estimates. By comparing the performance of different SRP models in the estimation of BeiDou PCOs, the SRP models suitable for the estimation of BeiDou-2 and BeiDou-3 PCOs are determined to solve final PCOs. The BeiDou satellite PCO estimates are compared with the model values currently used within the International GNSS Service, the manufacturer values published by the Test and Assessment Research Center of China Satellite Navigation Office, and a set of BeiDou-3 MEO PCO estimates previously reported by the Chang’an University. Finally, it is demonstrated that the orbit quality of BeiDou IGSO/MEOs and the accuracy of station coordinates obtained from BeiDou-only precise point positioning benefit from the newly estimated BeiDou PCO model.
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Acknowledgements
Thanks are due to Florian Dilssner for valuable discussions about the pre-launch calibration values for BeiDou satellite antennas. We are grateful to the anonymous reviewers for their helpful, constructive suggestions and comments, which significantly improve the paper quality. This work is partially supported by the National Natural Science Foundation of China (Nos. 41974031, 41704032, 41904025), National Key Research and Development Program of China (No. 2019YFC1509603), and Fundamental Research Funds for the Central Universities (No. 2042019kf0032). The numerical calculations in this paper have been done on the supercomputing system in the Supercomputing Center of Wuhan University. Finally, the IGS MGEX, iGMAS, and ILRS are greatly acknowledged for providing the Multi-GNSS and SLR data.
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Xia, F., Ye, S., Chen, D. et al. Estimation of antenna phase center offsets for BeiDou IGSO and MEO satellites. GPS Solut 24, 90 (2020). https://doi.org/10.1007/s10291-020-01002-0
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DOI: https://doi.org/10.1007/s10291-020-01002-0