Journal of Astronautics ›› 2016, Vol. 37 ›› Issue (5): 512-518.doi: 10.3873/j.issn.1000-1328.2016.05.002

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Rapid Design of Circumlunar Free Return High Accuracy Trajectory and Trans Lunar Window for Manned Lunar Landing Mission

HE Bo yong, LI Hai yang, ZHOU Jian ping   

  1. 1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;
     2. China Manned Space Agency, Beijing 100720, China
  • Received:2015-09-14 Revised:2015-11-21 Online:2016-05-15 Published:2016-05-25


A method for manned lunar landing mission trajectory and trans-lunar window integrated design is proposed considering with the task background and project constraints. Through the two coordinate rotations, circumlunar free-return trajectory parameter is decoupled to the independent variables in perilune. Free-return trajectories parameters and window quick search algorithm matching with low earth orbit (LEO) plane are achieved based on 4 stage two-body patched-conic approach under the double two-body model, and the result can be treated as the initial iterative value in the next step, which a free-return trajectory with high precise orbit dynamic model is obtained by sequential quadratic programming (SQP), a free-return trajectory and zero-window approach to LEO phase are gotten from the generation of the 90min neighborhood trajectories. The design example demonstrates the precision and rapidity of the circumlunar free-return trajectory and trans-lunar window approach with complex task background and rigorous project constraints for manned lunar landing mission.

Key words: Manned lunar landing, Circumlunar free-return, Trajectory design, Low earth orbit connection, Trans-lunar window

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