摘要： 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。
关键词:
天文导航,
姿态参数,
星图仿真,
卫星仿真软件,
计算模型
Abstract: A new method of star map simulation is proposed to test and evaluate the performance of star sensors.To start with,a star position calculation model based on the spacecraft is established,and stars are drawed in the celestial sphere according to the star point model.Then the field of view is changed on any attitude by the imaging method of star sensor.OpenGL’s perspective projection function is used to automatically image the star which can be seen in the field so as simplify the step of navigation star search and improve the simulation efficiency.The apparent position calculation model used for simulation is more precise,and the star model dispersion effect is better,which improves the centroid sub-pixel location accuracy.Simulation results show that the standard deviation of star positioning is less than 0.023 pixel and lower star angular distance error in the 32° field of view remains,which displays the high precision of star position and high imitation of real starry sky.
Key words:
celestial navigation,
attitude parameter,
star map simulation,
satellite simulation software,
calculation model
中图分类号: