控制受限的编队航天器鲁棒自适应控制

研究了考虑控制受限的编队航天器鲁棒自适应轨道跟踪控制问题。针对航天器编队飞行系统中控制受限、外部扰动和模型不确定性的情况，利用反步控制方法和指令滤波设计提出了一种鲁棒自适应控制策略。指令滤波器用于补偿控制受限对于控制器的影响，同时设计了自适应律对未知参数进行估计，并且利用Lyapunov稳定性理论分析了闭环系统的渐近稳定性。和滑模控制等传统鲁棒控制不同，所设计的鲁棒自适应控制器是连续的，更便于航天器编队飞行系统的实现。仿真结果表明所设计的控制器既能实现高精度的编队飞行跟踪控制，又能保证控制受限的要求。

Robust Adaptive Control of Spacecraft Formation Flight under Control Constraint

The problem of robust adaptive orbit tracking control of formation spacecraft under control constraint is investigated. According to the control constraint, external disturbances and model uncertainties in the spacecraft formation flight system, a robust adaptive control scheme is proposed by using both backstepping control approach and command filter design. The command filter is used to compensate the effect of control constraint on controller; meanwhile the adaptive law is designed to estimate the unknown parameters. And the asymptotical stability of the closed-loop system is analyzed by using Lyapunov stability theory. Different from the traditional robust control such as sliding mode control, the designed robust adaptive controller is continuous, so it is convenient to implementation of the spacecraft formation flight system. Simulation results show that the designed controller can achieve formation flying tracking control with high accuracy, and guarantee the demand for control constraint.