一种基于快速反射镜的星敏感器图像稳定系统  

A fast-steering mirror based image stabilization system for Star Sensor

作　　者：胡晓东[1] 丁小昆[1] HU Xiaodong;DING Xiaokun(The Flight Automatic Control Research Institute of AVIC,Xi’an 710065,China)

机构地区：[1]航空工业集团公司西安飞行自动控制研究所,西安710065

出　　处：《中国惯性技术学报》2020年第1期47-52,共6页Journal of Chinese Inertial Technology

基　　金：装备预研中航工业联合基金项目(6141B05060701)。

摘　　要：在机载星敏感器工作过程中,大气抖动和载体晃动将会导致星图模糊产生拖尾,影响测量精度,降低观测效率。基于快速反射镜的星敏感器图像稳定系统通过补偿图像位移保持光路的稳定性。首先利用改进的质心提取算法对星敏感器获取的星图进行开窗搜索,然后在窗口内计算星点质心坐标,以获得星点相对于图像中心的脱靶量。控制系统根据脱靶量驱动音圈电机,带动快速倾斜镜反向位移,补偿外界运动,将星点控制在图像中心,以达到稳定图像的目的。研究结果表明,当系统的校正频率为100Hz,曝光时间为8ms时,图像晃动的幅度可减小约3个像素。载体运动对成像的影响基本消除,同时大气抖动导致的图像抖动也被大大改善,系统的观测效率得以显著提升。During the operation of the airborne star sensor, star image is caused to be blurred by the atmosphere disturbance or carrier vibration, which influences measurement precision and decreases observation efficiency. The Fast-steering Mirror based image stabilization system in star sensor is presented to compensate the image motion to keep the optical path stable. First of all, the centroid of the star target is calculated by the barycenter method in a certain window, which is determined by searching from the star image acquired by star sensor in an improved centroid calculating method. Consequently, the miss distance between star target and image center could be obtained. According to this, the controlling system drives the voice coil motor to ensure the fast-steering mirror moving to compensate the carrier motion, which keeps the star staying at the center of the image and enhances the image stability. The experimental results show that, when the correcting frequency of the system is about 100 Hz and the exposure time is 8 ms, the vibration amplitude reduced by about 3 pixels. The influence of carrier vibration is mostly eliminated, and the impact of atmospheric disturbance has also been improved. Thus the observation efficiency is obviously increased.

关 键 词：快速反射镜 图像稳定 星敏感器 大气抖动 载体晃动 

分 类 号：TH752[机械工程—仪器科学与技术] V249.3[机械工程—精密仪器及机械]