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针对轮控式欠驱动卫星在系统初始角动量不为零时,不能通过定常光滑控制率稳定至任意平衡点的问题,通过对星本体某一视线轴惯性指向作约束,得到卫星可达到的某一稳定状态,并设计非线性奇异控制器,使系统从任意初始状态渐近稳定至目标点。数学仿真结果表明,控制器在满足系统角动量守恒的前提下,能够使视线轴快速运动并稳定至目标点,即视线轴与目标轴之间的夹角最小;同时,该控制器对初始姿态不敏感,在大小初始角动量的情况下都能很好地完成控制任务。
Aiming at the problem that the wheelset underactuated satellite can not be stabilized to any equilibrium point by the steady smooth control rate when the initial angular momentum of the system is not zero, A steady state and a nonlinear singular controller are designed to make the system asymptotically stable from any initial state to the target point. The mathematical simulation results show that the controller can make the visual axis move fast and reach the target point under the premise of keeping the angular momentum of the system conservative, that is, the angle between the visual axis and the target axis is the minimum. At the same time, Insensitive to control tasks well at the initial angular momentum of the size.