This paper presents a noncertainty equivalent adaptive backstepping control scheme for advanced fighter attitude tracking, in which unsteady effects, parameter uncertainties, and input constraints are all considered which increase the design difficulty to a large extent. Based on unsteady attitude dynamics and the noncertainty equivalent principle, a new observer is first developed to reconstruct the immeasurable and time-varying unsteady states. Afterwards, the unsteady aerodynamics is compensated in the backstepping controller where the command filter is introduced to impose physical constraints on actuators. In order to further enhance the robustness, the noncertainty equivalent adaptive approach is again used to estimate the uncertain constant parameters. Moreover, stability of the closed-loop system that includes the state observer, parameter estimator, and backstepping controller is proven by the Lyapunov theorem in a unified architecture. Finally, simulation results show that performance of the deterministic control system can be captured when attractive manifolds are achieved. The effectiveness and robustness of the proposed control scheme are verified by the Herbst maneuver.

中文翻译：

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具有不稳定影响和输入约束的先进战斗机的非确定性等效自适应反演控制。

本文提出了一种用于高级战斗机姿态跟踪的不确定性等价自适应反推控制方案，其中考虑了不稳定因素，参数不确定性和输入约束，这在很大程度上增加了设计难度。基于非稳态姿态动力学和不确定性等效原理，首先开发了一个新的观测器来重构不可测量且随时间变化的非稳态。之后，在后推控制器中补偿了不稳定的空气动力学特性，在后推控制器中引入了命令过滤器以对执行器施加物理约束。为了进一步增强鲁棒性，再次使用非确定性等效自适应方法来估计不确定的常数参数。而且，包括状态观察器在内的闭环系统的稳定性，Lyapunov定理在统一体系结构中证明了参数估计器和Backstepping控制器的有效性。最后，仿真结果表明，当获得有吸引力的歧管时，可以捕获确定性控制系统的性能。Herbst演算验证了所提出控制方案的有效性和鲁棒性。