JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS08] [JJ] Lunar science and exploration

Sun. May 21, 2017 9:00 AM - 10:30 AM 101 (International Conference Hall 1F)

convener:Hiroshi Nagaoka(Waseda Univ.), Tomokatsu Morota(Graduate School of Environmental Studies, Nagoya University), Masaki N Nishino(Institute for Space-Earth Environmental Research, Nagoya University), Chikatoshi Honda(The University of Aizu), Chairperson:Kazuto Saiki(Graduate School of Science, Osaka University), Chairperson:Hideo Hanada(RISE Project, National Astronomical Observatory)

9:30 AM - 9:45 AM

[PPS08-21] A simulation study of Lunar Farside Lander positioning with a Four-way Lander-Orbiter Relay Tracking Mode

*Mao Ye1, Fei Li1,2, Jianguo Yan1, Weifeng Hao2, Weitong Jin1, Xuan Yang1, Shengkai Zhang2 (1.State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, 2.Chinese Antarctic Center of Surveying and Mapping, Wuhan University)

Keywords:lunar farside, lander positioning, precise orbit determination, four-way relay tracking, Chang’E-4

The in-situ exploration of lunar farside is still an international blank until now. The reason is the synchronous rotation of the moon, which results in the unachievable between the lunar farside lander and earth tracking station. The traditional direct tracking mode, such as two-way range/range rate, VLBI delay/delay rate, will be ineffective for the farside lander tracking, therefore it is essential to relay the signal using a relay satellite. In this paper, we firstly give the updated mathematical formulas and the partials for the Four-way Lunar-Orbiter relay tracking measurement. Then, based on the independent precise orbit determination software system WUDOGS, the precise positioning of the lunar farside lander is studied with simulated tracking data. The results show that: with 0.1 mm/s measurement level, the positioning precision of the farside lander could reach the maximum of centimeter level using a circumlunar relay satellite (Fig. 1a); while for the L2 halo relay satellite (Fig. 1b), its accuracy could reach about 10 meters level. The conclusion could provide an important reference for the future lunar farside landing mission, especially for Chinese lunar exploration mission Chang’E-4.