Low velocity tracking control-based ADRC for large-scale telescope system

Huaxiang Cai; Yongmei Huang; Junfeng Du; Tao Tang; Dan Zuo

doi:10.1117/12.2196799

8 October 2015 Low velocity tracking control-based ADRC for large-scale telescope system

Huaxiang Cai, Yongmei Huang, Junfeng Du, Tao Tang, Dan Zuo

Proceedings Volume 9678, AOPC 2015: Telescope and Space Optical Instrumentation; 967803 (2015) https://doi.org/10.1117/12.2196799
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

In this paper, an improved Active Disturbance Rejection control (ADRC) method is proposed to enhance the tracking precision of telescope if the telescope runs in a low velocity. Low velocity telescope system usually suffers some obvious nonlinear disturbances, such as nonlinear friction and unknown external disturbance. Thereby, to ensure the tracking precision, multiple loops control structure is a common control method in telescope system, which includes current loop, velocity loop and position loop. The proposed control method is used in the velocity loop which consists of a PD controller and an Extend State Observer (ESO). The ESO is designed to estimate the disturbance involved in the telescope system. Besides, the PD controller is designed to stabilize the closed-loop system. Furthermore, this control method theoretically guarantees a prescribed tracking performance and final tracking accuracy. Finally, the experiment results show that the proposed control method has excellent performance for reducing the tracking error of low velocity.

Citation Download Citation

Huaxiang Cai, Yongmei Huang, Junfeng Du, Tao Tang, and Dan Zuo "Low velocity tracking control-based ADRC for large-scale telescope system", Proc. SPIE 9678, AOPC 2015: Telescope and Space Optical Instrumentation, 967803 (8 October 2015); https://doi.org/10.1117/12.2196799

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