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Backscaning step and stare imaging is a popular method for widening the coverage of Electro-Optical/Infra-Red (EO/IR) system. Meanwhile the high fresh rate of thermal panoramic scene is a significant factor for the false alarm rate of system in early warning, the precise motion of steering optical component in this short time as some micro seconds is a challenge, especially in high disturbance environment. The synchronization between optical movement and the integrating point demands the strict time and fine motion for speed-up, back-can and fly-back process of fast steering mirror (FSM). The paper presents the high-order trajectory scanning profile design method for FSM, thereby optimizing the required performance of systems component such as voice coil motor and also improving the overall quality of fly-back process. Next, the linearization feedback controller and linear state observer are used to control the system in both tracking follow trajectory and rejecting disturbance. Finally, a prototype version of fast steering system is built to apply new controller algorithms. The simulation and experimental results show the good agreement that RMS error of Line of Sight (LOS) can be achieved smaller than one hundred micro radian during back-scan process |
