动态星图显示算法的设计与实现  

Design and Realization of a Dynamic Display Algorithm for Star Map

作　　者：胡宜宁[1] 巩岩[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室

出　　处：《宇航学报》2008年第3期849-853,共5页Journal of Astronautics

基　　金：应用光学国家重点实验室开放基金(O6133FQ062)

摘　　要：为了对星敏感器进行功能和性能方面的测试,需要使用星模拟器,为其提供任一时刻、任一惯性坐标系下指向的模拟星图。星敏感器较短的积分时间特性,要求星模拟器具有较短的采样周期,为此,采取了分区检索导航星的设计方案。首先,根据星图视场,由各颗星的赤经、赤纬数据,对天球进行分区,并计算出给定的光轴所在的分区。然后,根据光轴分区位置,找出邻近的3×3个子区。最后,在这9个子区中,查找出视场内的星。同时,实现了星图的静态与动态模拟。模拟结果表明,利用该算法,可使星模拟器实现指标：星图视场为17.5°×13.1°;模拟星等为2.0～7.0等星;采样周期控制在毫秒级。基本满足动态星模拟器的大视场、宽星等范围、短采样周期等要求。A star simulator is used to test the function and performance of a star sensor by providing the simulating star map at any time and any coordinate system. Because of the characteristic of the short integral time of a star sensor, it is required that a star simulator needs a short sampling period. So, the design project is taken of seeking navigation stars by district-dlviding. First of all, divide the celestial sphere into districts by using the data of right ascension and declination. Then calculate which sub-district the optical-axis is in and find 9 sub-districts around it. Finally search the stars in field of view in the 9 sub-districts. Simulated results indicate that field of view of star map is 17.5°×13.1° and magnitude of stars simulated is 2.0 - 7.0, and the sampling period is controlled within millisecond. It can satisfy the system requirements of large field of view, wide magnitude range, as well as short sampling period.

关 键 词：星模拟器 星敏感器 星图模拟 显示算法 

分 类 号：V448.253[航空宇航科学与技术—飞行器设计]