非合作体附着下的组合体航天器自适应控制

空间中非合作体附着航天器本体后,新组合体惯量参数未知、系统引入的动量变化未知,容易造成航天器姿态控制失稳.针对此问题,提出了一种基于非合作组合体整体惯量估计的自适应控制方案,实现不同情形附着下新组合体姿态的快速和高精度恢复.通过构造李雅普诺夫函数,对自适应控制方案稳定性进行了证明.搭建的某卫星被非合作组合体附着后的姿控仿真平台表明,在非合作体惯量参数未知、引入动量未知以及附着前系统状态不定等恶劣情况下,采用该算法的组合体姿控误差可收敛到一个极小的领域内,可以实现对非合作组合体系统快速而有效的控制.

Adaptive Control Scheme for the New Spacecraft Combination after Non-cooperative Attachment

While non-cooperative attachment happens in space, the inertia of the new combination would be unknown, as well as the change of system momentum. This may lead to the instability of spacecraft attitude control. In order to solve the problem, this paper proposes an adaptive control scheme based on estimation of the new combination. And it can make the new combination of different situations reach the stable state with high precision and fast speed. In this paper, the stability of the adaptive control scheme is proved by constructing a Lyapunov function. The simulation environment of a satellite with non-cooperative attachment is constructed. It shows that the attitude error would converge to a small field by using the control scheme regardless of the awful cases, including unknown inertia parameters, added momentum and system status before the attachment. Besides, the simulation results show that the new combination system can be effectively and quickly controlled by the control scheme.