微型无人侦察机变倍同步聚焦镜头控制

摘要

根据微型无人侦察机系统机载摄像机需求,设计了一种用步进电机控制的摄像机镜头快速变倍同步聚焦控制电路.利用无人侦察机飞控系统内置ARM处理器的富余I/O资源,结合SiTI公司的MD127步进电机驱动器,完成了对两相步进电机的驱动,实现了高速飞行状态下平稳快速的变焦与聚焦功能.经过飞行测试,本系统能够安全可靠、精确稳定地工作.%To meet the needs of camera onboard mini Unmanned Reconnaissance Aerial Vehicle ( URAV) , a synchronous focus control circuit of camera lens controlled by stepper motor was designed. The driving of the bipolar stepper motor was implemented and the functions of rapid and smooth zooming and focusing during high speed flight were realized by adopting the redundant I/O resources of ARM processor inside the URAV control system and a SiTI company's MD127 stepper motor driver IC. Flight tests showed that the system can work reliably and accurately.