动态因素对星敏感器测星影响的分析
|
摘要
在捷联惯导系统中,星敏感器直接固定在弹体上,在动态环境下工作。本文根据光学成像原理、快门速度和图像传感器上星点移动速度等,建立了动态条件下星敏感器所获星点光斑的数学模型。通过计算机仿真得出了曝光时间与动态星点像元能量最大值的关系、不同曝光时间下的动态星点定位精度。仿真结果表明,动态星点像元能量最大值不能随着曝光时间的延长始终增大,动态星点形变对星点定位精度的影响可以忽略。
Star sensor is directly fixed on the missile in strap-down inertial navigation system.It works in a dynamic state because of the movement of missile.According to the theory of optical imaging,the speed of shutter and the velocity of star spot on image sensor,etc,dynamic star spot mathematical model is founded.Relationship between the maximum pixel energy of star spot and integration time is discussed by computer simulation.The position locating accuracy of dynamic star spot which is obtained in different time of exposure is also analyzed.The simulation results show that the maximum pixel energy of dynamic star spot can not increase continuously by extending time of exposure and the effect of the deformation of dynamic star spot on the accuracy of centroid location can be neglected.
Star sensor is directly fixed on the missile in strap-down inertial navigation system.It works in a dynamic state because of the movement of missile.According to the theory of optical imaging,the speed of shutter and the velocity of star spot on image sensor,etc,dynamic star spot mathematical model is founded.Relationship between the maximum pixel energy of star spot and integration time is discussed by computer simulation.The position locating accuracy of dynamic star spot which is obtained in different time of exposure is also analyzed.The simulation results show that the maximum pixel energy of dynamic star spot can not increase continuously by extending time of exposure and the effect of the deformation of dynamic star spot on the accuracy of centroid location can be neglected.
引文
[1]杨博雄.CCD细分技术及其应用研究[D].中国地震局地球物理研究所博士论文,2005:6.
[2]Hancock B R,etc.CMOS Active Pixel Sensor SpecificPerformance Effects on Star Tracker/Imager Position Ac-curacy[C].Proceedings of SPIE,2001,4284:44.
[3]董瑛,邢飞,尤政.基于CMOS APS的星敏感器光学系统参数确定[J].宇航学报,2004,(6):664.
[4]蔡喆,邓年茂.单星星图细分定位算法的研究[J].计算机仿真,2006,(3):35.
[5]魏新国,张广军,江洁.星敏感器中星图图像的星体细分定位方法研究[J].北京航空航天大学学报,2003,(9):813.
[6]王晓东.大视场高精度星敏感器技术研究[D].中国科学院研究生院博士论文,2003:18.
[2]Hancock B R,etc.CMOS Active Pixel Sensor SpecificPerformance Effects on Star Tracker/Imager Position Ac-curacy[C].Proceedings of SPIE,2001,4284:44.
[3]董瑛,邢飞,尤政.基于CMOS APS的星敏感器光学系统参数确定[J].宇航学报,2004,(6):664.
[4]蔡喆,邓年茂.单星星图细分定位算法的研究[J].计算机仿真,2006,(3):35.
[5]魏新国,张广军,江洁.星敏感器中星图图像的星体细分定位方法研究[J].北京航空航天大学学报,2003,(9):813.
[6]王晓东.大视场高精度星敏感器技术研究[D].中国科学院研究生院博士论文,2003:18.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心