一种改进的自适应滑模控制及其在航天器姿态控制中的应用

针对刚体航天器的鲁棒姿态控制问题,提出一种改进的自适应滑模控制(ASMC)算法.该算法除了不需要事先知道扰动及系统参数不确定性的上界外,还有效地解决了现有ASMC设计中对切换增益的过度适应问题.该算法具有以下优点:1)自适应的切换增益更接近扰动及参数不确定性的上界,能够产生低抖振的控制信号；2)控制力矩更为平滑,适于工程应用.仿真结果验证了所提出算法的有效性.

An improved adaptive sliding mode control for spacecraft attitude control

An improved adaptive sliding mode control(ASMC) strategy is presented to address the robust attitude control problem of uncertain rigid spacecraft.The proposed ASMC algorithm provides an effective solution for the over-adaptation problem in current ASMC design and removes the requirement of a prior knowledge of the upper bound of the model uncertainty as well.The advantages of the proposed method are twofold.Firstly,the resulting switching gain is much smaller and a lower-chattering control signal is generated.Second,the corresponding control torque is smoother,which is more suitable for engineering applications.Simulation results show the effectiveness of the proposed strategy.