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Augmented fixed-time observer-based continuous robust control for hypersonic vehicles with measurement noises

机译:具有测量噪声的基于固定时间的增强型基于观察者的连续超音速控制

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This study is concerned with the augmented fixed-time observer based adaptive super-twisting cruise control for flexible air-breathing hypersonic vehicles (FAHVs). First, the input-output linearisation technique is employed to derive a control oriented FAHV dynamic model. Then, a super-twisting controller is designed to track the reference velocity and altitude commands when faced with various uncertainties and disturbances. In addition, a novel gain adaptation law is constructed as a supplement of the super-twisting controller to avoid overestimating the values of controller gains. The adaptation law keeps the controller gains adapting dynamically to guarantee the finite-time convergence of sliding variables in the presence of disturbances with unknown boundaries. Moreover, augmented fixed-time observers are designed to estimate the true values of measured states and filter out high-frequency sensor noises. Thus, the fixed convergence time of these observers is achieved independently of initial estimation errors. Finally, the augmented fixed-time observers and adaptive super-twisting controller are combined together to ensure the superior tracking performances of FAHVs under the effects of uncertainties, disturbances, and measurement noises.
机译:这项研究与基于增强的固定时间观测器的自适应超扭曲巡航控制系统有关,该控制系统适用于柔性呼吸超音速飞行器(FAHV)。首先,采用输入输出线性化技术来推导面向控制的FAHV动态模型。然后,设计了一种超扭曲控制器,以在遇到各种不确定性和干扰时跟踪参考速度和高度指令。另外,构造了新颖的增益自适应定律作为超扭曲控制器的补充,以避免过高估计控制器增益的值。自适应律使控制器增益动态自适应,以确保在存在边界未知的干扰的情况下,滑动变量的有限时间收敛。此外,增强型固定时间观测器旨在估计测量状态的真实值并滤除高频传感器噪声。因此,这些观测器的固定收敛时间与初始估计误差无关。最后,将增强的固定时间观测器和自适应超扭曲控制器组合在一起,以确保在不确定性,干扰和测量噪声的影响下,FAHV具有出色的跟踪性能。

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