Abstract
China is planning to land a spacecraft on the farside of the Moon, a premiere, by 2018. In essence, the traditional tracking modes, based on direct visibility, cannot operate for the lunar farside lander tracking, and therefore a relay satellite, visible at the same time by both the lander and the Earth, will be required, operating in the so-called four-way mode (Earth-relay satellite-lander-relay satellite-Earth). In this paper, we firstly give the mathematical formulation of the four-way relay tracking mode and of its partial derivatives with respect to the relevant parameters, implemented in our POD software WUDOGS (Wuhan University Deep-space Orbit determination and Gravity recovery System). In a second step, in simulation mode, we apply this relay mode to determining lander coordinates, which are absolutely needed for a sample return mission, or to add constraints on rotation models of the Moon. The results show that with Doppler measurements at a 0.1 mm/s error level, the positioning of the farside lander could be done at centimeters level (1-\(\delta\)) in the case of a circumlunar relay satellite; and at a 5 meters level (1-\(\delta\)) in the case of a Lagrange point (L2) Halo relay satellite.
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Acknowledgements
This research is supported by National Scientific Foundation of China (Grant Nos. 41604004,41804025,41874010), Innovation Group of Natural Fund of Hubei Province (Grant Nos. 2015CFA011 and 2018CFA087), the Opening Project of Shanghai Key Laboratory of Space Navigation and Positioning Techniques (No. KFKT_201703), and China Postdoctoral Science Foundation (Grant No. 2016M602360). Jean-Pierre Barriot is founded by the French Space Agency (CNES), through a Decision d’aide à la Recherche. The anonymous reviewers are highly acknowledged for their constructive comments which improved the quality of this paper.
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Ye, M., Li, F., Yan, J. et al. The precise positioning of lunar farside lander using a four-way lander-orbiter relay tracking mode. Astrophys Space Sci 363, 236 (2018). https://doi.org/10.1007/s10509-018-3421-z
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DOI: https://doi.org/10.1007/s10509-018-3421-z