摘要
CCD噪声是影响星敏感器星点定位精度的误差源之一,以DV437-BU2型CCD为例,对CCD的暗电流、暗电流散粒噪声、暗电流不均匀噪声等的温度特性进行了实验测量.研究了CCD温度对星敏感器星点定位精度的影响,结果表明:对于DV437-BU2型CCD芯片,当CCD工作温度高于300K时,降温可以显著提高星敏感器星点定位精度,当CCD工作温度低于300K时,降温对星点定位精度的影响不明显;当温度由330K降到300K时,星点定位精度由0.12个像素提高至0.078个像素.
CCD noise is an error source of guide star position of star sensor. The DV437-BU2 CCD chip＇ s dark current, dark current shot noise and dark current non-uniform noise characteristics of temperature have been measured in this paper. The effect of CCD chip＇ s temperature on star position accuracy has been researched. The results show that decreasing CCD chip＇s temperature could improve the star position accuracy effectively when the temperature is higher than 300K, but could not remarkably when the temperature is lower than 300K. The star position accuracy level is improved from 0.12 pixel to 0. 078 pixel when the temperature reduces from 330K to 300K.
出处
《空间控制技术与应用》
2009年第6期36-40,共5页
Aerospace Control and Application
关键词
CCD
噪声
星敏感器
定位精度
致冷
CCD
noise
star sensor
position accuracy
refrigeration
