摘要
星敏感器广泛用于空间飞行器的姿态测量,为减少飞行器飞行过程中转动对星敏感器测量精度的影响,定量分析了捷联安装的星敏感器透光孔径、曝光时间、视场、焦距、像素数目与转速之间的关系,提出了大视场、短曝光时间、较少的像素都能提高星敏感器的动态。鉴于这三者之间是相互关联的,首先,由导航星的捕获概率确定了视场大小,然后,根据恒星辐射模型和CMOS有源像素传感器的噪声计算模型,确定了透光孔径、曝光时间。
In order to reduce the influence of rotation on attitude measured by CMOS APS star sensor strapped on the aero craft,the relation between the rotate speed and optical system parameters such as the effective aperture(D),the field of view(FOV),the time of exposal(T),the number of pixels(N) and the focal length(F) are analyzed.Larger FOV or shorter T or smaller N,or two of these factors all can enhance the dynamic of star sensor.First,FOV is obtained by the probability of guidance stars captured.Then,the model of star influx and the noise model of APS are presented,D,T and other parameters are calculated.
出处
《光学技术》
CAS
CSCD
北大核心
2007年第S1期72-73,76,共3页
Optical Technique
