高精度星敏感器天文标定方法及观测分析  

Astronomical calibration method and observation analysis for high-accuracy star sensor

作　　者：李春艳[1] 李怀锋[1] 孙才红[1] 

机构地区：[1]中国科学院国家天文台

出　　处：《光学精密工程》2006年第4期558-563,共6页Optics and Precision Engineering

摘　　要：提出了一种利用天顶观测来进行星敏感器标定的新方法。将地球当作均匀转动的转台,由一较精确的时钟代替刻度盘,用相对地球静止的星敏感器对天顶邻域进行观测。把星点作为目标,让其匀速扫过视场,建立星点坐标和对应恒星像点坐标的数学模型,求出位置传递函数。此方法简单、方便,标定精度高。通过实际星空观测,对连续拍摄的2037幅星图进行标定计算,每幅星图的积分时间为80 ms。实际观测星在α与δ方向上的标定误差分别为7.267 2″和6.922 0″,系统总的标定误差为10.036 2″。利用标定结果对连续拍摄的星图进行识别,得到星敏感器光轴指向误差为4.846 2″,标定结果比较理想。A new met the earth as the even spots were transited hod utilizing zenith observing to calibrate star sensor was proposed. By regarding ly rotational turntable and the star spots as the targets in this method, the star the FOV evenly. Then the mathematic model that the coordinates of star spots correspond to the star images was established to calculate the position transfer function. This method can achieve the higher calibration accuracy, and it is also very simple. Through observing the real sky, the 2037 star maps continuously are calibrated and calculated in integration time of every star map of 80 ms. The results show the calibration error of the observed stars are 7. 267 2＂ and 6. 922 0＂ in the direction of a and δ, respectively, and the system calibration error is 10. 036 2＂. The obtained star maps are identified using the calibration result. It is indicated that optical axis directional error is 4. 846 2＂, which shows the calibration result is more perfect.

关 键 词：星敏感器 标定 天顶观测 传递函数 

分 类 号：V448.22[航空宇航科学与技术—飞行器设计]