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Improved Adaptive Sliding Mode Control for Rigid Spacecraft Attitude Tracking

机译：刚性航天器姿态跟踪的改进自适应滑模控制

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This paper considers the attitude tracking problem of a rigid spacecraft involving inertia matrix uncertainty and external disturbance. First, an adaptive integral sliding mode control (ISMC) is proposed for when the upper bound on the lumped uncertainty is unknown in advance. It is shown that such a combination can produce a much smaller switching gain than the current adaptive sliding mode control (ASMC); hence, the overadaptation problem in existing ASMC design is effectively solved. Additionally, the system performance is improved by virtue of the global sliding mode feature of ISMC. A similar, but more flexible, ASMC design is introduced to further enhance the results; this design is developed on the basis of the reference trajectory scheme. The validity of the proposed strategies is verified by both theoretical analysis and simulation results.
机译：本文考虑了具有惯性矩阵不确定性和外部干扰的刚性航天器的姿态跟踪问题。首先，提出了一种自适应积分滑模控制（ISMC），用于预先确定集总不确定性的上限。结果表明，与当前的自适应滑模控制（ASMC）相比，这种组合产生的开关增益要小得多。因此，有效解决了现有ASMC设计中的过度适应问题。此外，借助ISMC的全局滑模功能，可以提高系统性能。引入了类似但更灵活的ASMC设计，以进一步提高结果。此设计是在参考轨迹方案的基础上开发的。理论分析和仿真结果均验证了所提策略的有效性。

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