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为测试和评估星敏感器性能,提出一种航天器上星敏感器成像的仿真方法。建立基于航天器平台的恒星视位置计算模型,利用星点模型在天球上绘制出全天星图,通过星敏成像原理完成任意姿态下的视场转换。使用OpenGL的透视投影功能自动成像可见星,省略导航星搜索环节,提高仿真效率。仿真使用的视位置计算模型更精确,星点模型弥散效果更好,提高了星点亚像元细分定位的精度。仿真结果表明,星点定位标准差在0.023像素以内,在32°视场内,星间角距误差较低,仿真效果逼近真实星空。
In order to test and evaluate the performance of star sensor, a simulation method of spacecraft star sensor imaging is proposed. Based on spacecraft platform, the model of stellar apparent position calculation is established. The star image is drawn on the celestial sphere using the star point model. The transformation of the field of view under arbitrary attitude is accomplished by the principle of star-sensitive imaging. Use OpenGL’s Perspective Projection feature to automatically visualize visible stars, omitting navigation star search sessions and improve simulation efficiency. The model of apparent location calculation used in simulation is more accurate, the diffuse effect of the star point model is better, and the precision of subdivision positioning of the star point is improved. The simulation results show that the standard deviation of satellite positioning is within 0.023 pixels, and the error of inter-satellite angular distance is lower in the 32 ° field of view, and the simulation effect approaches the real star.