CCD噪声模型在几何最优线性姿态估计中的应用  

Application of CCD noise model in geometric OLAE

作　　者：周世龙[1] 龚德仁[1] 段登平[1] 

机构地区：[1]上海交通大学航空航天学院,上海200240

出　　处：《传感器与微系统》2015年第3期154-157,160,共5页Transducer and Microsystem Technologies

基　　金：52批中国博士后科学基金资助项目(2012M520899)

摘　　要：星敏感器噪声主要来源于CCD图像传感器和控制与数据处理电路,这些噪声对姿态估计精度的影响不容忽视。在研究了CCD图像传感器中光子散粒噪声、暗电流噪声、电荷转移噪声及读出噪声四种主要噪声的基础上,分析了它们对亚像元质心法提取精度的影响。根据亚像元质心法提取结果,采用几何解析的最优线性姿态估计(OLAE)方法解算卫星姿态。仿真结果表明:考虑星敏感器噪声模型比单纯引入高斯白噪声具有更高的姿态估计精度。The remarkable noises of star sensor mainly come from CCD image sensor,and control and data processing circuit,and effect of these noises on precision of attitude estimation can not be ignored. On the basis of studying CCD image sensor noises such as photon shot noise,dark current noise,charge transfer noise and readout noise,their effects on extraction precision of subpixel centroid method are analyzed. According to results of subpixel centroid method satellite attitude is calculated by use geometric analytic OLAE method. Simulation results show that star sensor noise model has higher precision of attitude estimation compared with the model which only introduces Gaussian white noise.

关 键 词：CCD图像传感器噪声 亚像元质心法 几何 最优线性姿态估计 

分 类 号：V448.22[航空宇航科学与技术—飞行器设计]