超高精度星跟踪器影响误差源的一般约束
General constraints on influential error sources for super-high accuracy star tracker
摘要：
虽然采用在轨标定方法可以将星跟踪器上单个星点的位置误差降低到0.02 pixel以内，但对于一些较大的误差源，在轨标定的精度达到什么程度，往往导致在轨校正效率低下。本文基于Cramer Rao下界（CRLB）理论，给出了高斯型轮廓的最小误差约束的一般理论和估计，不仅包括位置约束，还包括强度和尺度约束。通过对运动、焦距漂移等进行约束，可以在发射前解析地确定飞行误差源的容限和星跟踪器的最终精度。
英文摘要：
Though in-orbit calibration is adopted to reduce position error of individual star spot down to 0.02pixel on star tracker, little study has been conducted on the accuracy to what extent for some significant error sources which often leads to in-orbit correction inefficiency. This study presents the general theory and estimates of the minimum error constraints, including not only on position but also on intensity and scale of Gaussian shaped profile based on Cramer Rao Lower Bound(CRLB) theory. By imposing those constraints on motion, drift in focal length and so on, margins of in-flight error sources and the final accuracy of star tracker can be analytically determined before launch.
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