关键词: 载人登月, 极地探测, 地月转移, 轨道设计, 轨道特性

Abstract: An Earth Moon transfer orbit scheme combining free return orbit with three impulse maneuver orbit is adopted for manned lunar polar exploration missions. In terms of the design of the free return phase, a two phase patched model based on pseudo perilune parameters is established and an improved multi conic method considering correction of Earth oblateness is used. Simulation results show the improved multi conic method has a higher accuracy and can provide better initial values for the accurate design. In terms of the design of the three impulse maneuver phase, based on the hybrid orbit model, a method combining maneuvering at special points with Lambert algorithm is proposed for computation. Simulation results show this method can reduce the velocity increment effectively. Finally, with a great deal of simulation the velocity increment characteristics of orbit are analyzed. The research conclusions can provide significant reference for the design of Earth Moon transfer orbit scheme for manned lunar polar exploration missions in the future.

Key words: Manned lunar landing, Polar exploration, Earth Moon transfer, Orbit design, Orbit characteristics