扫描镜稳定度对TDI CCD测量精度的影响  

Impact of scan mirror stability on TDI CCD system measure accuracy

作　　者：贺小军[1,2] 曲宏松[1,2] 张贵祥[1,2] 王金玲[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]小卫星技术国家地方联合工程研究中心,吉林长春130033

出　　处：《中国光学》2014年第4期665-671,共7页Chinese Optics

基　　金：国家高技术研究发展计划(863计划)资助项目(No.2007AA12Z113)

摘　　要：利用TDI CCD成像数值仿真模型,研究了TDI CCD测量系统的测角精度随扫描镜速度稳定度的变化规律。首先根据TDI CCD推扫成像的物理过程,建立了数值仿真模型,设计了从光学像和扫描镜稳定度到数字图像的仿真链路;然后利用图像重心计算方法求取图像中心坐标并得到目标点的角位置坐标;通过蒙特卡诺法进行海量打靶试验,对结果进行统计得到扫描镜各稳定度水平上的测量精度值;最后将某工程样机的扫描镜速度稳定度带入仿真模型,仿真结果表明:测试误差增大5.67μrad,达到了像元角分辨率的1/4。在光学测量系统的系统设计时,需要考虑像元分辨率及扫描镜稳定度的综合影响,选用合适的扫描镜稳定度要求,使测量角分辨率满足用户需求。Numerical simulation model of TDI CCD imaging is used to study the relationship between the speed stability of the scanning mirror and angle measurement accuracy in a TDI CCD measurement system .First, based on the physical process of TDI CCD push-broom imaging , a numerical simulation model is established to describe the whole process from optical image and scan mirror stability to digital images , and then gravity cen-tre of image is calculated and the target angular coordinate is got;Monte Carlo method is used to complete a simulation experiment , and the statistical results could describe the relation between stability of the scanning mirror and measure accuracy .In the end , the speed stability of an engineering scanning mirror is substituted into the simulation module , and the simulation results show that the error increases by 5.67μrad, reached 1/4 of pixel angular resolution.So in high-precision measurement, the comprehensive influence of the pixel an -gular resolution and the speed stability of the speed stability need to be considered .The appropriate speed stabilityof the scanning mirror showed be chosen to meet the requirement of pixel angular resolution .

关 键 词：光学测量 TDI CCD 成像仿真 扫描镜 

分 类 号：TP701[自动化与计算机技术—检测技术与自动化装置]