Abstract
Orbital maneuvers are usually performed as needed for low earth orbiters to maintain a predefined trajectory or formation-flying configuration. To avoid unexpected discontinuities and to connect pre- and post-maneuver arcs with a minimal set of parameters, a maneuver has to be considered in the routine GPS-based orbit determinations. We propose a maneuver handling method in a reduced-dynamic scheme. With the proper thrust modeling and numerical integration strategy, the effects caused by orbital maneuver can be largely eliminated. The performance for both single-satellite precise orbit determination (POD) and inter-satellite precise baseline determination (PBD) is demonstrated using selected data sets from the Gravity Recovery and Climate Experiment (GRACE) mission. For the POD results, the orbit determination residuals indicate that the orbit with maneuver modeling is well fit to the GPS observations. The external orbit validation shows that the GRACE-B orbits obtained from our approach match the DLR reference orbits better than 3 cm (3D RMS), which is comparable to the result of the maneuver-free GRACE-A satellite. For the PBD results, on average 87 % of double-difference phase ambiguities can be resolved to integers and an RMS of the K-band ranging system residuals of better than 0.7 mm can be achieved, even though the orbital maneuver was performed on the spacecraft. Furthermore, the actual maneuver performance derived from the POD and PBD results provides rigorous feedback on the thruster system, which is not only beneficial for current maneuver assessment but also for future maneuver plans.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (Nos. 61370013 and 91438202). The authors would like to thank the Information Systems and Data Center (ISDC) and the German Space Operations Center (GSOC) for providing the science data and maneuver information of the GRACE mission. We also want to acknowledge Dr. Yoke Yoon for providing the information that helped the research and reviewing the paper. Last but not least, the comments and suggestions of the anonymous reviewers are greatly appreciated.
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Ju, B., Gu, D., Herring, T.A. et al. Precise orbit and baseline determination for maneuvering low earth orbiters. GPS Solut 21, 53–64 (2017). https://doi.org/10.1007/s10291-015-0505-x
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DOI: https://doi.org/10.1007/s10291-015-0505-x