Abstract
Tiangong-2 is the first Chinese real space laboratory, launched into earth orbit with an altitude of approximately 393 km on September 15, 2016. Precise orbit determination (POD) is one of the essential conditions for conducting onboard scientific research. The precise orbit of Tiangong-2 is mainly determined by the reduced-dynamic method using space-borne global navigation satellite system (GNSS) data, which are collected by an onboard dual-frequency GNSS receiver. The in-flight performance of the receiver is first assessed in terms of tracking ability, code multipath errors and noise levels of code and carrier phase observations. Then, the effects of refined non-gravitational force models and GNSS antenna phase center variations (PCVs) on the POD are analyzed. The estimated empirical accelerations are substantially reduced by 45% in the along-track direction using a macro-model compared to that using a cannonball model for drag computation. The application of antenna PCVs correction leads to better consistency between reduced-dynamic and kinematic orbit solutions. Satellite laser ranging validation shows that the accuracy of Tiangong-2 precise orbits is 1.7 cm after using the improved reduced-dynamic method. Based on the orbit determination results, the quality of Tiangong-2 orbit predictions is assessed for periods without and with the refined non-gravitational force models. The use of the macro-model and high-quality density models for drag computation is shown to help improve orbit prediction quality.
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The data that support the findings of this study are available from the corresponding author for non-commercial purposes on request.
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Acknowledgements
This research was supported by the National Natural Science Foundation of China (Nos. 61803018, 41874028 and 91438202) and the international GNSS Monitoring & Assessment System (iGMAS) data center. The authors would like to thank the Technology and Engineering Center for Space Utilization (CSU) for providing GNSS observations and SLR data. We also want to acknowledge the CODE for providing the GNSS precise orbit and clock products. In addition, the authors want to thank the Editor and the reviewer for their valuable remarks that helped to improve the original manuscript.
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Shao, K., Gu, D., Ju, B. et al. Analysis of Tiangong-2 orbit determination and prediction using onboard dual-frequency GNSS data. GPS Solut 24, 11 (2020). https://doi.org/10.1007/s10291-019-0927-y
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DOI: https://doi.org/10.1007/s10291-019-0927-y