高精度高动态星模拟器研究

给出了高精度高动态星模拟器系统组成和总体结构, 提出一种基于亚像素显示技术提高动态星模拟器星点位置显示精度从而减小星点几何中心与能量中心位置偏差的新方法. 针对动态星模拟器高动态性要求, 提出一种快速精确检索全天球导航星的新方法, 将已知SAO (Smithsonian Astrophysical Observatory) 星表进行分区, 计算当前姿态四元数并分析航天器视轴所在区域, 对于距离视轴较远区域停止搜索和匹配, 很大程度上缩小了导航星搜索范围, 进而缩短了全天球恒星遍历所需时间. 软件测试结果表明, 此快速检索法可使全天球导航星的选取速度提高近10倍.

Study on High Precise and High Dynamic Star Simulator

The composition and overall structure of high precise and high dynamic star simulator system is presented, and a new method is put forward based on sub-pixel display technology to improve the dynamic star simulator to display the star point more precisely, which can reduce the position deviations of both geometric center and the energy center of the star point. Meanwhile, a new method for fast and accurate retrieval of the navigational star in the entire celestial sphere is presented by partitioning the SAO (Smithsonian Astrophysical Observatory) star catalogue, analyzing the four elements of the spacecraft attitude to determine where the visual axis points to, eliminating the search and match of navigational stars far from the visual axis so as to reduce the search area, hence decreasing the time that the whole celestial stars traversal required. Through simulation testing, results show that the speed of this quick search method to select the celestial navigational star has been increased by nearly 10 times.