月球探测器悬停控制技术的研究

月球探测器近月面定点悬停是月球探测器实现月面软着陆的必要保证。提出一种近月面定点悬停的控制方案,选用常推力液体发动机和脉冲式发动机实现悬停任务。对于常推力液体发动机,以燃耗最省为指标采用最优控制,使月球探测器悬停在特定高度上;对于脉冲式发动机采用PID控制,实现月球探测器悬停状态的保持。给出具体设计方法,仿真结果表明方案可行。

Study on the Hover Control of the Lunar Probe

Hovering in a certain height is essential for the lunar probe to achieve lunar soft landing.A control scheme is proposed,in which liquid engine of constant thrust and impulse thruster are chosen to achieve hover task.For the liquid engine of constant thrust,the optimal control is used to achieve the zero velocity of the lunar probe,aiming at consuming the minimal fuel.For the impulse thrusters,the PID control is used to control the height,and then the maintenance of the hover state is realized.Particular design methods are presented in this paper.Simulation results prove that the scheme is available.