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多干扰下望远镜指向系统高稳定性复合控制方法研究

Research on High-Stability Composite Control Methods for Telescope Pointing Systems under Multiple Disturbances.

作者信息

Zhang Rui, Zhao Kai, Fang Sijun, Fan Wentong, Hai Hongwen, Luo Jian, Li Bohong, Sun Qicheng, Song Jie, Yan Yong

机构信息

MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics & School of Physics and Astronomy, Frontiers Science Center for TianQin, Gravitational Wave Research Center of CNSA, Sun Yat-sen University (Zhuhai Campus), Zhuhai 519082, China.

出版信息

Sensors (Basel). 2024 May 2;24(9):2907. doi: 10.3390/s24092907.

DOI:10.3390/s24092907
PMID:38733013
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11086222/
Abstract

During the operation of space gravitational wave detectors, the constellation configuration formed by three satellites gradually deviates from the ideal 60° angle due to the periodic variations in orbits. To ensure the stability of inter-satellite laser links, active compensation of the breathing angle variation within the constellation plane is achieved by rotating the optical subassembly through the telescope pointing mechanism. This paper proposes a high-performance robust composite control method designed to enhance the robust stability, disturbance rejection, and tracking performance of the telescope pointing system. Specifically, based on the dynamic model of the telescope pointing mechanism and the disturbance noise model, an controller has been designed to ensure system stability and disturbance rejection capabilities. Meanwhile, employing the method of an norm optimized disturbance observer (HODOB) enhances the nonlinear friction rejection ability of the telescope pointing system. The simulation results indicate that, compared to the traditional disturbance observer (DOB) design, utilizing the HODOB method can enhance the tracking accuracy and pointing stability of the telescope pointing system by an order of magnitude. Furthermore, the proposed composite control method improves the overall system performance, ensuring that the stability of the telescope pointing system meets the 10 nrad/Hz @0.1 mHz~1 Hz requirement specified for the TianQin mission.

摘要

在空间引力波探测器运行期间，由于轨道的周期性变化，由三颗卫星组成的星座构型逐渐偏离理想的60°角。为确保星间激光链路的稳定性，通过望远镜指向机构旋转光学组件，实现对星座平面内呼吸角变化的主动补偿。本文提出了一种高性能鲁棒复合控制方法，旨在提高望远镜指向系统的鲁棒稳定性、抗干扰能力和跟踪性能。具体而言，基于望远镜指向机构的动力学模型和干扰噪声模型，设计了一个控制器，以确保系统的稳定性和抗干扰能力。同时，采用 范数优化干扰观测器（HODOB）方法增强了望远镜指向系统的非线性摩擦力拒斥能力。仿真结果表明，与传统干扰观测器（DOB）设计相比，采用HODOB方法可将望远镜指向系统的跟踪精度和指向稳定性提高一个数量级。此外，所提出的复合控制方法改善了整个系统的性能，确保望远镜指向系统的稳定性满足天琴计划规定的10 nrad/Hz @0.1 mHz~1 Hz要求。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ecd/11086222/8e2e396e50b5/sensors-24-02907-g009.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ecd/11086222/9e9966b57d74/sensors-24-02907-g011.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ecd/11086222/d6778dc70f67/sensors-24-02907-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ecd/11086222/bae16ecfc810/sensors-24-02907-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ecd/11086222/b4e383d87f72/sensors-24-02907-g016.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ecd/11086222/272a7f0cfab9/sensors-24-02907-g017.jpg

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本文引用的文献

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The closed-loop control method based on dual-port adaptive internal model control for fine image stabilization of space telescopes.基于双端口自适应内模控制的空间望远镜精细图像稳定闭环控制方法。
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Frequency Division Control of Line-of-Sight Tracking for Space Gravitational Wave Detector.视轴跟踪的频分控制在空间引力波探测器中的应用。
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