混合小推力航天器日心悬浮轨道保持控制

Station-keeping control of spacecraft using hybrid low-thrust propulsion in heliocentric displaced orbits

针对太阳帆、太阳电混合推进航天器日心悬浮轨道保持控制问题进行了研究。为解决基于局部线性化模型设计轨道保持控制器时存在的控制精度不高、模型精确性过度依赖等问题,应用自抗扰控制(ADRC)技术设计了轨道保持控制器。首先,采用圆形限制性三体问题(CRTBP)模型推导了混合小推力航天器日心悬浮轨道动力学方程;然后,考虑系统模型不确定性和外部扰动,提出了一种基于扰动估计和补偿的轨道保持控制方法;最后,数值仿真表明存在系统模型不确定性、初始入轨误差及地球轨道偏心率扰动等因素的情况下,所设计的控制器仅需很小的速度增量即可实现高精度的日心悬浮轨道保持控制。

In this paper,station-keeping of heliocentric displaced orbits using a hybrid of solar sail and solar electric propulsion is investigated.In order to avoid the problem of low control precision and excessive dependence on model accuracy,which occurs when controllers are designed according to locally linearized models,a station-keeping control method based on active disturbance rejection control（ADRC）technique is proposed.Firstly,the dynamic model of a spacecraft using hybrid low-thrust propulsion in the heliocentric displaced orbit is derived based on the circular restricted three-body problem（CRTBP）.Secondly,considering unmodelled dynamic and external disturbance,a station-keeping control method based on disturbance estimation and compensation is then presented.Finally,numerical simulations show that in the presence of system uncertainties,initial injection errors,and perturbations of the eccentric nature of the Earth＇s orbit,high station-keeping control precision can be achieved with relative small velocity increment.