A review on control methodologies of disturbance rejections in optical telescope

Tao Tang; Shuaixu Niu; Jiaguang Ma; Bo Qi; Ge Ren; Yongmei Huang

doi:10.29026/oea.2019.190011

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Tang T, Niu SX , Ma JG, Qi B, Ren G et al. A review on control methodologies of disturbance rejections in optical telescope. Opto‐Electron Adv 2, 190011 (2019). doi: 10.29026/oea.2019.190011

Citation:

Tang T, Niu SX , Ma JG, Qi B, Ren G et al. A review on control methodologies of disturbance rejections in optical telescope. Opto‐Electron Adv 2, 190011 (2019). doi: 10.29026/oea.2019.190011

Review Open Access

A review on control methodologies of disturbance rejections in optical telescope

1.
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
2.
Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu 610209, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

More Information

^*Corresponding author: B Qi, E-mail: qibo@ioe.ac.cn

Received Date 01 March 2019

Accepted Date 25 June 2019

Available Online 18 October 2019

Published Date 18 October 2019

Abstract

Abstract

Structural vibrations in Tip-Tilt modes usually affect the closed-loop performance of astronomically optical telescopes. In this paper, the state of art control methods-proportional integral (PI) control, linear quadratic Gaussian (LQG) control, disturbance feed forward (DFF) control, and disturbance observer control (DOBC) of Tip-Tilt mirror to reject vibrations are first reviewed, and then compared systematically and comprehensively. Some mathematical transformations allow PI, LQG, DFF, and DOBC to be described in a uniform framework of sensitivity function that expresses their advantages and disadvantages. In essence, feed forward control based-inverse model is the main idea of current techniques, which is dependent on accuracies of models in terms of Tip-Tilt mirror and vibrations. DOBC can relax dependences on accuracy model, and therefore this survey concentrates on concise tutorials of this method with clear descriptions of their features in the control area of disturbance rejections. Its applications in various conditions are reviewed with emphasis on the effectiveness. Finally, the open problems, challenges and research prospects of DOBC of Tip-Tilt mirror are discussed.
- structural vibrations /
- astronomical telescope /
- Q-filter /
- error-based DOBC /
- Tip-Tilt mirror

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References

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