摘要
提出一种导航星表的构建方法,该方法以星跟踪器视场内最亮恒星作为信标,把信标锁定在视场中心,测量视场内其他恒星到信标的角间隔,把测量的所有恒星角间隔和信标的赤经、赤纬存储到导航星表中。基于该方法,利用史密森天文观测台恒星星表(SAO),选择星等小于6等的恒星,建立起导航星表,该星表仅包括5103颗星,其容量仅为1.2兆。相对三角形算法,该星表容量更小,可节省星载系统的存储空间,减少识别时间,提高跟踪速率。蒙特-卡诺仿真结果表明,利用该导航星表识别信标具有较好的抗干扰性,且当星跟踪器测角误差(3σ)在1μrad以内时,信标正确识别概率几乎为100%。
A method to construct guide star catalog for deep space optical communication system is proposed in the paper. The method makes use of the brightest star as the beacon and locates it in the centre of the view field of a star tracker, calculates the angle intervals of other stars from the beacon in the view field of the star tracker, and stores all the measured angle intervals and right ascension and declination of the star in the guide star catalog. Based on this method and SAO, a guide star catalog is set up by selecting the stars including 5103 stars below magnitude 6, with a capacity of only 1.2M. in contrast to star catalog constructed with triangle algorithm, the capacity of the star catalog is less, which can save much storage space, reduce the execution time and raise the tracking rate of deep space optical communication. Results from performed Monte-carol simulation show that when the angular measurement error of the star tracker is below 1μrad the correct identification probability is nearly 100%.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2006年第1期31-33,58,共4页
Opto-Electronic Engineering
关键词
深空光通信
星跟踪器
导航星表
蒙特-卡诺仿真
Deep space optical communication
Star tracker
Guide star catalog
Monte-carol simulation
