地月L2点位于地月连线的延长线上,在地月L2点运行的卫星可以连续观测月球背面,解决月球背面与地球之间的通讯问题,在月球背面着陆探测任务中起着至关重要的作用。对从地球出发、利用月球引力辅助变轨、形成地月L2点的轨道进行了研究,分析了发射窗口、地月转移时间、近月点高度、近月点倾角、轨道振幅等多项因素对转移轨道和使命轨道特性的影响,寻求满足地月L2点中继任务需求的飞行轨道。通过分析研究,文章明确了转移和使命轨道的相关特性,可为中继星任务轨道的参数设计和优化提供有益参考。 Earth’s L2 point is located on the extension line of the Earth-Moon connection. A satellite operating at L2 at Earth’s Moon can continuously observe the back of the moon to solve the communication problem between the back of the Moon and the Earth. It plays a crucial role in the lunar back-ground exploration mission Important role. Starting from the Earth, the use of lunar gravity-assisted orbit change, the formation of the lunar L2 point orbit was studied, the launch window, the moon and moon transfer time, the recent point height, the recent point of inclination, orbit amplitude and many other factors Transfer orbit and mission orbital characteristics of the impact of seeking to meet the L2 months relay mission needs of the orbit. Through the analysis and research, the article clarifies the characteristics of the orbit and the orbit of the transition and the mission, which can provide useful reference for the parameter design and optimization of the mission orbit of the satellite.