在多重干扰下对望远镜指向系统的高稳定性复合控制方法的研究
Rui Zhang1, Kai Zhao1, Sijun Fang1
1MOE 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.
Sensors (Basel, Switzerland)
|May 11, 2024
概括
太空引力波探测器需要稳定的望远镜指向. 使用H-无限控制器和H-无限规范优化的干扰观察器的新复合控制方法显著提高了对天等任务的指向精度和稳定性.
科学领域:
- 太空物理空间物理学
- 天体物理学 天体物理学
- 控制系统工程 控制系统工程
背景情况:
- 太空引力波探测器依赖于精确的卫星间激光链接.
- 卫星星座的几何结构对于链路稳定至关重要,由于轨道变化而偏离理想的配置.
- 望远镜的指向机制积极补偿这些角度偏差.
研究的目的:
- 为望远镜指向系统提出一种高性能,强大的复合控制方法.
- 为了增强强大的稳定性,干扰排斥和跟踪性能.
- 为了满足太空任务的严格指向稳定性要求.
主要方法:
- 开发了一个复合控制策略,将一个H-infinity控制器和一个H-infinity规范优化干扰观察器 (HODOB) 结合起来.
- 根据望远镜指向机制和干扰噪声的动态模型设计了H-infinity控制器.
- 集成的HODOB专门解决非线性摩擦和改善干扰排斥.
主要成果:
- 与传统的干扰观察器 (DOB) 相比,HODOB方法在跟踪精度和指向稳定性方面显示出一个数量级的改进.
- 复合控制方法显著提高了整体系统性能.
- 实现了满足天任务要求的指向稳定性,即10 nrad/Hz^1/2 @0.1 mHz~1 Hz.
结论:
- 提出的强大的复合控制方法对于稳定太空任务中的望远镜指针系统非常有效.
- 霍多布提供了卓越的非线性摩擦排斥和干扰排斥能力.
- 该方法确保了未来引力波观测台所需的精确指向稳定性.
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