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Sensors 2017, 17(3), 479; doi:10.3390/s17030479

Error-Based Observer of a Charge Couple Device Tracking Loop for Fast Steering Mirror

1,2,* , 1,2,3
,
1,2
,
1,2
,
1,2
,
1,2
and
1,2
1
Key Laboratory of Optical Engineering, Chinese Academy of Science, Chengdu 610209, China
2
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
3
University of Chinese Academy of Sciences, Beijing 100039, China
*
Author to whom correspondence should be addressed.
Academic Editor: Manuela Vieira
Received: 13 January 2017 / Revised: 19 February 2017 / Accepted: 24 February 2017 / Published: 28 February 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [1759 KB, uploaded 28 February 2017]   |  

Abstract

The charge couple device (CCD) tracking loop of a fast steering mirror (FSM) is usually used to stabilize line of sight (LOS). High closed-loop bandwidth facilitates good performance. However, low-rate sample and time delay of the CCD greatly limit the high control bandwidth. This paper proposes an error-based observer (EBO) to improve the low-frequency performance of the CCD tracking system. The basic idea is by combining LOS error from the CCD and the controller output to produce the high-gain observer, forwarding into the originally closed-loop control system. This proposed EBO can improve the system both in target tracking and disturbance suppression due to LOS error from the CCD’s sensing of the two signals. From a practical engineering view, the closed-loop stability and robustness of the EBO system are investigated on the condition of gain margin and phase margin of the open-loop transfer function. Two simulations of CCD experiments are provided to verify the benefits of the proposed algorithm. View Full-Text
Keywords: CCD error-based observer; fast steering mirror; image sensor; light of sight error; low-rate sample; time delay CCD error-based observer; fast steering mirror; image sensor; light of sight error; low-rate sample; time delay
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Tang, T.; Deng, C.; Yang, T.; Zhong, D.; Ren, G.; Huang, Y.; Fu, C. Error-Based Observer of a Charge Couple Device Tracking Loop for Fast Steering Mirror. Sensors 2017, 17, 479.

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