利用库仑力实现悬停轨道的新方法研究

摘要

A new method for realizing hovering formation in close proximity is investigated with main focus on design of open-loop and close-loop control law. The new method utilizes inter-spacecraft coulomb forces to control relative motion. Hence, plume contamination caused by classical thrusters could be mitigated. First, a mathematical description of the Coulomb hovering formation is established by using polar coordinates. Then, an open-loop control law is provided with respect to the case of elliptic reference orbit. For the case of circular reference orbit, linearized dynamics is obtained by linearizing the model about a nominal hovering formation, and then is used to analyze close-loop feedback control law. Numerical examples are provided to demonstrate the performance of the control laws. The approach proposed in the paper could also be used in other scenario of formation flying in high earth orbit.%研究了利用库仑力控制实现近距离悬停轨道的问题.针对常规推力器对悬停任务可能产生的羽流污染,提出了一种使用航天器间库仑力实现悬停轨道的新方法,并研究了使用该方法实现悬停轨道的开环与闭环控制问题.基于所建立的库仑力悬停轨道动力学模型,给出了目标为一般椭圆轨道时的开环控制律.基于线性化的悬停轨道动力学模型,给出了目标轨道为圆轨道时的闭环控制律,并进行了数值仿真,结果表明所建立的动力学模型及所设计的控制律是有效的和可行的.文章提出的方法也可以用于其他类型的航天器近距离相对运动控制问题.