天线伺服系统实时数据建模及其控制器设计平台

发布时间：2018-02-12 17:20

本文关键词： 大口径射电望远镜系统辨识抗低频风扰动控制器设计软件　出处：《华南理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：大口径射电望远镜已广泛应用于天文观测等领域。材料科学、结构力学等学科的发展，使得射电望远镜能够向大型化发展，但因结构大型化天线指向精度和抗干扰能力问题也随之而来。经典控制理论下的控制器如PI控制器设计简单，在无太多选择的情况下能够应用于天线上以改善指向精度和抗干扰能力。但随着天线指向精度和抗干扰能力要求的提高，经典控制器往往显得力不从心。特别是当大型天线系统面临低频风扰动的复杂环境时，更无法使系统达到高精度的伺服指标。因而本文提出了一种基于内模原理的最优二次型输出反馈控制算法，并且专门讨论了在此控制算法下，大型天线伺服系统的伺服性能的表现。仿真结果以及现场试验结果均表明此控制算法在伺服系统的指向精度和抗低频风扰动方面表现优异。然而，最优控制理论应用的前提往往是基于精确的模型。为此，在设计先进控制器前，本文讨论了一种基于伪随机信号的Hankle矩阵辨识法，实现了对系统的精确辨识。本文最后介绍了一种帮助设计控制器的软件平台。本文讨论的系统辨识方法，以及控制器设计算法，都可以为大口径射电望远镜伺服控制系统的设计提供参考。
[Abstract]:Large-aperture radio telescopes have been widely used in astronomical observation and other fields. With the development of materials science, structural mechanics and other disciplines, radio telescopes can be developed to a large scale. However, the problems of pointing accuracy and anti-jamming ability of large-scale antenna are also following. The controller based on classical control theory, such as Pi controller, is simple in design, and can be applied to antenna without too many choices to improve pointing accuracy and anti-jamming ability, but with the increase of antenna pointing precision and anti-interference ability, The classical controller often appears to be unable to do the task, especially when the large antenna system is facing the complex environment of low frequency wind disturbance, it can not make the system achieve the high precision servo index. In this paper, an optimal quadratic output feedback control algorithm based on internal model principle is proposed. The performance of large antenna servo system, simulation results and field test results show that this control algorithm is excellent in pointing accuracy and low frequency wind disturbance resistance of servo system. However, the premise of the application of optimal control theory is usually based on accurate model. Therefore, before designing advanced controller, this paper discusses a Hankle matrix identification method based on pseudorandom signal, and realizes the accurate identification of the system. Finally, a software platform to help design the controller is introduced. The system identification method discussed in this paper, as well as the controller design algorithm, can provide a reference for the design of the servo control system of the large aperture radio telescope.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH751

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