Error-based observation control of an image-based control loop for disturbance suppression in segmented lightweight large-scaled diffractive telescope (SLLDT)

Ruan, Yong; Xu, Tian; Liu, Yang; Xie, Zongliang; Ma, Haotong; Du, Junwei; Yang, Tao; Tang, Tao; Hu, Yang; Peng, Zhenming

doi:10.1016/j.optlaseng.2022.107105

Cited by 5 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, some researchers have focused their efforts on disturbance observerbased (DOB) [17] control algorithms. The main feature of these algorithms is to estimate the external disturbances using the structure of the observer [18], [19] and then suppress them. Recently, the optimal designing Q-filter based on Youla parameterization is proposed to reduce the waterbed effect and to cope with different types of vibrations in tip-tilt mirror systems [20], [21].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Observer-Based Repetitive Control for Tip-Tilt Disturbance Rejections Beyond Control Bandwidth in Optical-Stabilized Systems

Feng

Ruan

et al. 2023

IEEE Photonics J.

Self Cite

View full text Add to dashboard Cite

The stabilization and tracking performance of an image-based tip-tilt system is usually deteriorated by tip-tilt vibrations and beam jitter in optical links due to a limited tip-tilt correction bandwidth. This paper proposes an enhanced observer-based repetitive control (OBRC) method to break the bandwidth limitation of the time delay tip-tilt stabilized loop, which achieves high-frequency disturbance rejections beyond control bandwidth even up to Nyquist frequency. The enhanced repetitive controller is fused with the optimized observer based on Youla parameterization, which improves the stability of the closed-loop and reduces the waterbed effect in non-repetitive frequency. Furthermore, the time delay of the closed-loop system could be compensated by the OBRC. Therefore, disturbance suppressions can be transformed into the design of a repetitive controller, which is effective and easy to be used for tip-tilt vibrations and beam jitter suppression. Finally, simulation and experimental results show that the OBRC effectively suppresses the high-frequency disturbance beyond the control bandwidth of the optical-stabilized system.

show abstract