Controller design for the sub-axis of large aperture telescope base on fast observation target

RongQi Ma; YunXia Xia; Xiang Liu; LiangZhu Yuan; JiaMing Lei; ZhiWeng Wang; JiaWei Yuan; Tong Zhang; Chunshen Xiang; Qiang Wang; ChuanXin Luo; YongMei Huang; Yi Tan; QiLiang Bao; Ge Ren

doi:10.1117/12.2604203

13 December 2021 Controller design for the sub-axis of large aperture telescope base on fast observation target

RongQi Ma, YunXia Xia, Xiang Liu, LiangZhu Yuan, JiaMing Lei, ZhiWeng Wang, JiaWei Yuan, Tong Zhang, Chunshen Xiang, Qiang Wang, ChuanXin Luo, YongMei Huang, Yi Tan, QiLiang Bao, Ge Ren

Author Affiliations +

Proceedings Volume 12070, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirror and Telescopes; 1207008 (2021) https://doi.org/10.1117/12.2604203
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

Compound axis servomechanism (CAS) is the most popular form of structure used in the large aperture telescope (LAT) system in the last few decades. In the control system of the CAS, the sub-axis which is driven by a fast-steering mirror (FSM) plays a decisive role in observation target tracking. In this paper, the kinetic dynamic of fast observation target (FOT) is analyzed by the time-frequency spectrum method. A sub-axis controller base on the FOT’s kinetic dynamic is proposed to improve the tracking performance of the CAS system. Traditional double-loop control is applied in sub-axis control. The inner loop is designed to provide a large bandwidth to cope with the FOT. As for the outer loop, a new control approach that is PIPI double integrations control is introduced to achieve a better tracking performance for the FOT. Additionally, the relationship between time delay and bandwidth of the LAT system is analyzed to demonstrate that the time delay is the main restriction to further improve the bandwidth of a CCD-based sub-axis controller. The theory and the simulation result indicate the proposed approach can improve the tracking performance of the LAT system to a certain extent, but still not sufficient when it comes to the FOT.

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RongQi Ma, YunXia Xia, Xiang Liu, LiangZhu Yuan, JiaMing Lei, ZhiWeng Wang, JiaWei Yuan, Tong Zhang, Chunshen Xiang, Qiang Wang, ChuanXin Luo, YongMei Huang, Yi Tan, QiLiang Bao, and Ge Ren "Controller design for the sub-axis of large aperture telescope base on fast observation target", Proc. SPIE 12070, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirror and Telescopes, 1207008 (13 December 2021); https://doi.org/10.1117/12.2604203

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KEYWORDS

Ear

Time-frequency analysis

Telescopes

Control systems

Error analysis

Charge-coupled devices

Device simulation

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