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为了确保空间遥感相机的成像质量,设计了采用光电编码器的输出值作为线位移反馈量实现闭环控制的调焦控制系统。从保证航天航空设备安全性、可靠性、高精度、高抗干扰能力出发,介绍了反馈装置的选取原则,阐述了调焦控制系统的构成,给出了调焦控制系统的硬件及软件实现,并对调焦控制系统的精度进行了实验分析。本调焦控制系统在航天相机中的应用试验表明:应用光电编码器的角度量输出值作为反馈量形成闭环控制的调焦控制系统,减少了由于步进电机和机械传动结构本身造成的调焦误差,具有较高的调焦精度,满足总体设计的像平面位置控制精度为±2个光电编码器码值的要求。
In order to ensure the imaging quality of the space remote sensing camera, a focusing control system using closed-loop control using the output value of the photoelectric encoder as the linear displacement feedback is designed. From the assurance of safety, reliability, high precision and high anti-interference ability of aerospace equipment, the principle of selection of feedback device is introduced, the structure of focusing control system is described, the hardware and software of focusing control system are given, Focusing control system and the accuracy of the experimental analysis. The application of the focusing control system in the space camera shows that the application of the optical encoder's angular output value as the feedback to form the closed-loop control focusing control system reduces the focusing caused by the stepping motor and the mechanical transmission structure itself Error, with high focusing accuracy, to meet the overall design of the image plane position control accuracy of ± 2 photoelectric encoder code value requirements.