For a practical engineering system, disturbances usually have a negative impact on system performance. Especially, when the system physical constraints (e.g., actuator amplitude saturation and input channel constraint) are present, the study for antidisturbance controllability (ADC) is of paramount importance. This article presents the concepts of disturbance estimability, disturbance compensability, and an enhanced antidisturbance control (EADC). From the viewpoint of control system design, an example of spacecraft attitude control is given. The control constraints and multiple disturbances are explicitly analyzed for the sake of attitude control system design of flexible spacecraft. Subsequently, an EADC approach with integration of the disturbance observer-based control (DOBC) and active disturbance rejection control (ADRC) is proposed, based on the characteristics of disturbances exposed. Moreover, prescribed performance approach is incorporated into the spacecraft attitude tracking control. In consequence, the presented control can not only achieve superior antidisturbance capability than DOBC or ADRC, but also quantify the control performances. Numerical simulations and hardware-in-the-loop tests exemplify the applicability of the proposed scheme.

中文翻译：

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应用于柔性航天器的抗干扰可控性分析和增强抗干扰控制器设计

对于实际的工程系统，扰动通常会对系统性能产生负面影响。特别是，当系统物理约束（例如，执行器振幅饱和和输入通道约束）存在时，抗干扰可控性 (ADC) 的研究至关重要。本文介绍了干扰可估计性、干扰补偿性和增强型抗干扰控制 (EADC) 的概念。从控制系统设计的角度，给出了航天器姿态控制的一个例子。为了柔性航天器的姿态控制系统设计，明确分析了控制约束和多重扰动。随后，提出了一种基于干扰观测器的控制（DOBC）和自抗扰控制（ADRC）相结合的 EADC 方法，基于暴露的扰动特征。此外，规定的性能方法被纳入航天器的姿态跟踪控制。因此，所提出的控制不仅可以实现优于 DOBC 或 ADRC 的抗干扰能力，而且还可以量化控制性能。数值模拟和硬件在环测试举例说明了所提出方案的适用性。