近期，实验室博士生李晓磊作为第一作者，导师孙光辉教授作为通讯作者的论文“Fractional-Order Nonsingular Terminal Sliding Mode Tension Control for the Deployment of Space Tethered Satellite”已被国际权威期刊IEEE Transactions on Aerospace and Electronic Systems录用。

该论文针对空间绳系卫星系统的子星释放任务，提出了一种新型的分数阶非奇异终端滑模控制方案。该控制方案充分考虑了空间绳系系统的欠驱动特性、外界干扰和输入饱和等影响，不依赖辅助推进器，仅通过调节系绳张力即可实现子星的快速稳定释放任务。该论文的主要贡献是为空间绳系系统的欠驱动控制问题设计了分数阶非奇异终端滑模控制器，避免了传统终端滑模控制器的奇异性问题，且相比整数阶方法显著提高了系统的动态性能。此外，该论文提出了一种分数阶干扰观测器来有效地处理时变的外界干扰，并通过仿真验证了其相对于传统观测器的优越性。最后，该论文研究了一种分数阶自适应律来补偿系绳张力饱和的不利影响，解决了系绳释放过程中的异常释放速率问题。

Abstract

In this work, a novel fractional-order nonsingular terminal sliding mode (FONTSM) control scheme is developed, which guarantees the desired deployment performance of space tethered satellite (STS) system. The presented control scheme is to stabilize the underactuated deployment mission with only tension regulation. Based on the underactuated model, a practicable integer-order nonsingular terminal sliding mode (IONTSM) controller is designed to realize the deployment of STS system, with the finite-time stability. Then, to improve the deployment performance, the fractional-order calculus is introduced to raise the FONTSM controller, whose Mittag-Leffler-based uniform ultimate boundedness is proved to ensure the finite-time convergence and steady-state performance. In the FONTSM controller, a fractional-order disturbance observer and a fractional-order adaptive compensation law are proposed, to eliminate the adverse impacts of external disturbances and input saturation respectively. Moreover, compared to the reported fractional-order sliding mode control strategy of STS system, a better deployment performance can be obtained by the IONTSM and FONTSM controllers in this work. Finally, the effectiveness of the proposed controllers is verified by groups of deployment simulations of STS system.