快速反射镜在像移补偿中的应用

Application of fast steering mirror in image motion compensation

本文提出了一种基于快速反射镜的像移补偿方法用于解决航空成像中的像移问题。首先通过计算航空相机在曝光时间内的像移速度证明了像移补偿的必要性;针对快速反射镜存在伺服模型不确定性的问题,设计了模型参考自适应控制器;最后通过实验验证了该算法的性能,结果显示:采用本算法后,快速反射镜的阶跃响应稳定时间降低了50%以上,在振动情况下快速反射镜的稳定精度都可以达到10μrad,精度比传统控制方案提升10倍以上。最终的像移补偿成像实验成功验证了基于快速反射镜的像移补偿方案有较高的工程应用价值。

A method of image motion compensation based on Fast Steering Mirrors(FSM)is proposed to solve the problem of image motion in aeronautical imaging.Firstly,the necessity of image motion compensation is proven by calculating the image motion velocity of the aeronautical camera in exposure time.Then,a model reference adaptive controller is designed to solve uncertainties in the servo model of an FSM.The experimental results indicate that the stable time of step response is reduced by more than 50%comparing with traditional methods.The stability accuracy of the FSM can reach 10μrad even under vibration condition,which means the accuracy of this method is 10 times better than that of traditional methods.A final image motion compensation imaging experiment proves that our image motion compensation scheme based on an FSM has high value in engineering applications.