| 星敏感器测量模型及其在卫星姿态确定系统中的应用 |
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| 引用本文： | 刘一武,陈义庆.星敏感器测量模型及其在卫星姿态确定系统中的应用[J].宇航学报,2003,24(2):162-167. |
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| 作者姓名： | 刘一武 陈义庆 |
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| 作者单位： | 北京控制工程研究所,北京市2729信箱20分箱,北京,100080 |
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| 摘 要： | 星敏感器是卫星高精度姿态测量的重要部件，如何正确建立其测量误差模型是影响姿态确定精度的关键因素。本文推导出星敏感器三轴姿态测量误差的方差计算公式，对测量误差的性质进行研究，揭示了在星敏感器三轴测量中，光轴测量精度劣于根据另两轴测量所确定的光轴指向精度。在此基础上提出了新的星敏感器测量模型，给出改进的姿态滤波器观测方程，减小了观测误差，由此可以进一步提高姿态确定的精度。本文方法不仅适用于通常使用的双星敏感器姿态确定系统，也可独立地应用于只带单个星敏感器的姿态确定系统。
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| 关 键 词： | 星敏感器 卫星 测量模型 姿态测量 测量误差 |
| 文章编号： | 1000-1328(2003)02-0162-06 |
| 修稿时间： | 2002年3月4日 |
Star-sensor measurement model and its application to the spacecraft attitude determination system |
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| LIU Yi wu,CHEN Yi qing.Star-sensor measurement model and its application to the spacecraft attitude determination system[J].Journal of Astronautics,2003,24(2):162-167. |
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| Authors: | LIU Yi wu CHEN Yi qing |
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| Abstract: | For a satellite attitude determination system based on star sensors.It is important to make an exact model of star sensors measurement error.The error model of three axis attitude measurement with star sensor was studied.We derived the formula for calculating measurement error variance.The error statistical characteristic was also analyzed.It is shown the precision of optic axis measurement is inferior to that one of optic axis direction determinated by the other two axis measurement.Following this conclusion,a better observation equation for attitude filtering was presented,with which the precision of attitude determination can be improved.The offered approach is applicable not only to an attitude determination system with two star sensors,but also to one with a single star sensor. |
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| Keywords: | Star sensor Attitude measurement Attitude determination |
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