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2017, Volume 18, Issue 10

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Frontiers of Information Technology & Electronic Engineering >> 2017, Volume 18, Issue 10 doi: 10.1631/FITEE.1601221

Modeling of a dynamic dual-input dual-output fast steeringmirror system

. Ocean College, Zhejiang University, Zhoushan 316021, China.. School of Digital Media & Design, Hangzhou Dianzi University, Hangzhou 310018, China.. State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Jilin 130033, China.. Blue-Science Opto-Electronics Co. Ltd., Hangzhou 310018, China.. Core Tomorrow Science & Technology Co. Ltd., Harbin 150080, China

Available online: 2018-01-18
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Abstract

A modeling method is proposed for a dynamic fast steering mirror (FSM) system with dual inputs and dual outputs. A physical model of the FSM system is derived based on first principles, describing the dynamics and coupling between the inputs and outputs of the FSM system. The physical model is then represented in a state-space form. Unknown parameters in the state-space model are identified by the subspace identification algorithm, based on the measured input-output data of the FSM system. The accuracy of the state-space model is evaluated by comparing the model estimates with measurements. The variance-accounted-for value of the state-space model is better than 97%, not only for the modeling data but also for the validation data set, indicating high accuracy of the model. Comparison is also made between the proposed dynamic model and the conventional static model, where improvement in model accuracy is clearly observed. The model identified by the proposed method can be used for optimal controller design for closed-loop FSM systems. The modeling method is also applicable to FSM systems with similar structures.

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