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为了满足在地面对星敏感器进行误差标定及功能测试时的实时性要求,及避免因导航星漏选现象引起的检测误差,提出了一种改进的全天球分区动态星图仿真算法。它可以实现飞行器任意时刻发射、任意姿态下的在轨星图仿真。算法中充分考虑了天球上赤经弧长随纬度增加而逐渐缩短的情况,对传统的赤经赤纬划分天球的方法进行了改进,提出了一种新的天区划分,采用新的分区检索方法搜索导航星,既避免了导航星的漏选也提高了星图更新频率。分析了星点光斑的数学模型,使得星图仿真更加真实。对星图因动态产生的扫尾现象进行了仿真,可以很好地仿真飞行器在轨高动态情况下星敏感器的实际工作情况。
In order to meet the real-time requirement of error calibration and function test of the star sensor on the ground and to avoid the detection error caused by missed star selection, an improved all-celestial zonal dynamic star map simulation algorithm is proposed. It can be achieved at any time launch aircraft, orbit at any attitude under the star map simulation. In the algorithm, the arc length of the celestial arc on the celestial sphere is gradually shortened as the latitude increases. The traditional method of dividing the celestial sphere by the aurigadendelunchus is improved. A new celestial division is proposed, and a new zoning search The method of searching for navigation stars not only avoids the missed selection of navigation stars but also improves the frequency of star map update. The mathematical model of star point spot is analyzed, which makes the star map simulation more realistic. This paper simulates the dynamic sweep of star image, which can well simulate the actual working condition of star sensor under the condition of orbit high dynamic.