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Integrated fault tolerant attitude control approach for satellite attitude system with sensor faults

机译：具有传感器故障的卫星姿态系统综合容错姿态控制方法

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摘要

In this study, a novel integrated fault tolerant control (FTC) strategy is proposed for a rigid satellite attitude systems under the case of external disturbance, Lipschitz nonlinearity, and sensor faults. Different from the traditional adaptive fault estimation method, an augmented fault estimation observer is designed for the considered faulty satellite attitude system, which could be used for estimating both system state and sensor fault. A virtual observer is firstly introduced, and then, a real observer is derived as a result of the unmeasurable information to be used for the design of the virtual observer. On this basis, an integrated FTC approach is developed for the considered faulty satellite attitude system by combining backstepping control and fractional order nonsingular terminal sliding mode control techniques, such that the closed-loop system not only has good robustness to external disturbance but also has better fault tolerance capability to unknown sensor fault. Finally, a simulation example is provided to demonstrate the feasibility and advantage of the proposed FTC scheme.
机译：在本研究中，在外部干扰，Lipschitz非线性和传感器故障的情况下，提出了一种新的综合容错控制（FTC）策略。不同于传统的自适应故障估计方法，设计了一个增强的故障估计观察者，专为考虑的故障卫星姿态系统而设计，可用于估算系统状态和传感器故障。首先介绍虚拟观察者，然后，作为用于设计虚拟观察者的设计的未估量信息，导出真实观察者。在此基础上，通过组合反向控制和分数终端滑动模式控制技术，为考虑的故障卫星姿态系统开发了一种集成的FTC方法，使得闭环系统不仅具有对外部干扰的良好鲁棒性，而且还具有更好未知传感器故障的容错能力。最后，提供了一种模拟示例以证明所提出的FTC方案的可行性和优点。

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