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Optical Engineering

Acceleration feedback of a CCD-based tracking loop for fast steering mirror
Author(s): Tao Tang; Yongmei Huang; Chengyu Fu; Shunfa Liu
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Paper Abstract

In the control system of a CCD-based tracking loop for a fast steering mirror (FSM), the most effective method often employed to improve pointing performance is to increase high gain of the control system for a high bandwidth, which, however, usually suffers a great deal from a low CCD sampling rate and the mechanics of the FSM. Moreover, the amount of time delay engendered by sampling and data processing can significantly reduce the performance of a closed-loop system. Therefore, a tentative approach to the implementation of a CCD-based tracking control system with acceleration feedback is proposed. In theory, the position open loop is made of double integrators with a high bandwidth of the acceleration feedback loop; in fact, however, the acceleration open loop of the FSM response includes a quadratic differential, and it is very difficult to compensate a quadratic differential with an integral algorithm. To solve this problem, a novel acceleration closed system such as a bandpass filter is proposed. The position is reconstructed into a simple first-order filter instead of a third-order control system. In addition experimental results show that the acceleration feedback proposed here can effectively enhance the bandwidth of the closed-loop system and its trajectory tracking and pointing performance.

Paper Details

Date Published: 1 January 2009
PDF: 6 pages
Opt. Eng. 48(1) 013001 doi: 10.1117/1.3065500
Published in: Optical Engineering Volume 48, Issue 1
Show Author Affiliations
Tao Tang, Institute of Optics and Electronics (China)
Yongmei Huang, Institute of Optics and Electronics (China)
Chengyu Fu, Institute of Optics and Electronics (China)
Shunfa Liu, Institute of Optics and Electronics (China)

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