航空光电成像消旋电视数字控制器

Digital controller for aerial camera with despun control

介绍了消旋电视摄像系统的工作原理,通过对系统的分析,得出了消旋系统保证像质所允许的最大旋转角速度。根据消旋速度要求,设计了消旋系统的电视数字控制器。该控制器以DSP为核心微处理器;以测速机为速度敏感元件,作为系统速度环的反馈;速率陀螺测得飞行器的扰动速率,用作速度环的前馈。系统采用了传统的超前滞后补偿方法,并加入了积分环节以减小稳态时的漂移角速度。实验结果表明,在消旋拍摄过程中,消旋速度满足设计要求,拍摄图片清晰,消旋速率精度为14.3(°)/s。理论分析和实验结果都证明了该消旋摄像系统的可行性。

The principle of the despun digital control of a CCD camera is introduced, and a maximum rotational speed for assuring an ideal image in despun control system is obtained by analyzing the system. According to the speed of the despun control, a digital controller of camera for despun control system is design by taking a DSP as its core, a velocimeter as speed sensitive element to offer feedback for velocity loop in the system, and perturbation frequency measured by rate gyroscope as a feedforward function. The experiment results show that the velocity meets the demand of despun controll for its good image quality and the precision standard of 14.3（°）/s. Theoretical and lab researches both prove the feasibility of the despun control system.