地月系L2平动点轨道长期维持过程研究

针对地月系L2平动点附近两种常用轨道——拟halo轨道和Lissajous轨道,研究了轨道长期维持过程。采用穿越xz平面单圈控制的轨道维持策略,控制量通过单步预测法进行寻优。在全摄动动力学模型下对拟halo轨道和Lissajous轨道受控维持下的一年飞行过程分别进行了仿真和比较,结果显示Lissajous轨道的维持控制代价优于拟halo轨道,从轨道拓扑构型保持方面对该结果进行解释,并设计对比实验加以验证。研究结论对地月系L2平动点轨道选择、维持控制策略设计、长期飞行效果分析等方面具有工程参考意义。

Earth-Moon L2 Libation Point Orbit Long Term Station Keeping

Earth-Moon L2 libration point is unstable. The necessary orbit station keeping operations are required for spacecraft in order to maintain around Earth-Moon L2 libration point for a long time. Long term station keeping operations fortwo types of orbits, quasi-Halo orbit and Lissajous orbit, are studied. Control once per cycle when crossing the xz plane is used as the control strategy. Control values are chosen by single step prediction. One year trajectories of quasi-Halo orbit and Lissajous orbit with station keeping are simulated in the real celestial mechanics model respectively. Comparison of simulation results shows that the cost of station keeping for Lissajous orbit is lower than that of the quasi-Halo orbit. This can be explained from orbit topological configuration. Corresponding contrast experiment is designed to verify the inference. Research results have engineering reference for Earth-Moon L2 libration point selection, station keeping control strategy design, long term trajectory and effect analysis.