Aiming at the uncertainty and external disturbance sensitivity of the near space vehicles (NSV), a novel sliding mode controller based on the high-order linear extended state observer (LESO) is designed in this paper. In the proposed sliding mode controller, the double power reaching law is adopted to enhance the state convergence rate, and the high-order LESO is designed to improve the antidisturbance ability. Moreover, the appropriate observer bandwidth and extended order are selected to further reduce or even eliminate the disturbance by analyzing their influences on the observer performance. Finally, the simulation demonstrations are given for the NSV control system with uncertain parameters and external disturbances. The theoretical analyses and simulation results consistently indicate that the proposed high-order LESO with carefully selected extended order and observer bandwidth has better performance than the traditional ones for the nonlinear NSV system with parametric uncertainty and external disturbance.

中文翻译：

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基于高阶线性扩展状态观测器的近空间飞行器滑模控制

针对近空间飞行器（NSV）的不确定性和外部干扰敏感性，设计了一种基于高阶线性扩展状态观测器（LESO）的新型滑模控制器。在所提出的滑模控制器中，采用双功率到达定律来提高状态收敛速度，并设计了高阶LESO来提高抗干扰能力。此外，选择适当的观察者带宽和扩展顺序，以通过分析干扰对观察者性能的影响来进一步减少甚至消除干扰。最后，给出了具有不确定参数和外部干扰的NSV控制系统的仿真演示。