摘要
空间目标的天基观测是未来空间目标监视系统的主要观测方式。天基观测可以利用轴系定位和天文定位两种方式实现对空间目标的定位,其中天文定位方式能够达到较高的定位精度。星载相机的姿态测量误差和目标位置提取误差都会影响空间目标的天文定位精度。基于此,本文推导了空间目标天基天文定位的误差公式,结合一套星载相机的参数,采用计算机仿真的方法,研究并分析了各项误差因素对天文定位精度的影响规律。计算结果表明,空间目标的视赤经的精度随视轴赤纬角的增大而变差,视赤纬精度水平高于视赤经的精度水平;将空间目标成像在CCD面中心位置附近,能够得到较高的定位精度;视位置测量精度与目标星点质心提取精度呈线性关系;就目前的硬件水平而言,视赤纬可以达到标准偏差优于2″的水平,视赤经精度稍差。
Space-based observation is a main observation mode of space surveillance system in the future.There are two positioning mode,i.e.shafting positioning and celestial positioning,and the latter has better positioning accuracy.The accuracy of space-based celestial positioning come under the influence of attitude error of camera onboard and coordinates error of space objects.So in this paper,error formulas are derived for space-based celestial positioning of space objects.By means of computer simulation,using estimated parameters of a typical camera,the law on how errors are affected by positioning accuracy are researched and analyzed.The results show that the accuracy of apparent right ascension becomes worse as the declination increases,and the accuracy of apparent declination is better than that of apparent right ascension;When the image point of a space object is near the principal point of CCD,the positioning accuracy is better;The centroiding accuracy of space object influences the accuracy of angular measurements linearly;So far as current hardware performance is concerned,the standard deviation of apparent declination is better than 2″ and the standard deviation of apparent right ascension is worse.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2010年第5期1345-1351,共7页
Journal of Astronautics
基金
民用航天预先研究项目(C5220062303)
中国科学院西部之光"西部博士资助项目"(A08K020)
关键词
空间目标
天基观测
天文定位
误差分析
Space object
Space-based observation
Celestial positioning
Error analysis
