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对空间非合作目标的近程自主跟踪过程中目标可能会由于不确定原因出现轨道变动时的近程自主跟踪控制问题进行了研究,提出了一种全局鲁棒最优滑模控制器方法。针对空间非合作目标自主跟踪问题的标称系统,由基于无限时域的二次型性能指标的最优控制理论,获得最优调节器,再构造一个积分滑模面,使系统开始即在滑模面上,消除了传统滑动模态中的趋近模态,并使控制系统滑动模态与对应标称系统的最优动态有相同的形式,则滑动模态亦是渐近稳定的,且具有完全的鲁棒性;为保证滑动模态的存在,设计了滑模变结构控制器。该方法吸取了最优控制和滑模控制的优点,可在优化燃耗的同时满足全局鲁棒稳定性。仿真分析结果表明:用该法可实现对空间非合作目标轨道变动时的自主稳定跟踪,保证跟踪的精度。
In the process of short-range autonomous tracking of space non-cooperative targets, the target may have short-range autonomous tracking control problems due to uncertainties when orbital changes occur. A global robust optimal sliding mode controller method is proposed. For the nominal system of autonomous tracking of space non-cooperative targets, an optimal regulator is obtained from the optimal control theory of quadratic performance index based on infinite time-domain, then an integral sliding-mode surface is constructed to make the system begin sliding On the die surface, the approach mode in the traditional slip mode is eliminated, and the sliding mode of the control system has the same form as the optimal dynamic of the corresponding nominal system, the sliding mode is also asymptotically stable, and Which has complete robustness. In order to ensure the existence of sliding modes, a sliding mode variable structure controller is designed. The method draws the advantages of optimal control and sliding mode control, and can satisfy the global robust stability while optimizing the fuel consumption. The simulation results show that this method can realize the autonomous stable tracking when the space non-cooperative target orbit changes, and ensure the tracking accuracy.