色温对星敏感器恒星定位精度的影响  

Effect of Color Temperature on Position Accuracy of Star Sensor

作　　者：刘海波[1] 谭吉春[1] 沈本剑[1] 杨建坤[1,2] 范清春[2] 

机构地区：[1]国防科技大学理学院技术物理研究所,长沙410073 [2]空间智能控制技术国家级重点实验室,北京100190

出　　处：《光电工程》2009年第11期35-38,42,共5页Opto-Electronic Engineering

摘　　要：色温影响星敏感器恒星定位精度。运用光线追迹方法,研究色温对恒星定位精度的影响。在分析不同色温恒星光谱分布特征的基础上,建立恒星光谱模型,计算色温差异引起的恒星定位误差。计算结果表明:中心视场附近色温差异引起的恒星定位误差较视场边缘小;通过合理选择光学系统的响应波段,可以减小色温差异引起的恒星定位误差,但会损失恒星到达探测器感光面的光能量。例如,当响应波长从300～1100nm减小为400～800nm时,星敏感器视场(0°,0°)、(0°,2°)和(0°,4°)处的单颗恒星定位误差分别减小为0.0422″、1.9652″和3.3891″,约为原来的54%、65%和70%;色温为9600K、7600K、5600K和3600K的恒星像斑能量分别约为原来的58%、62%、63%和51%。Position accuracy of star sensor is restricted by color temperature of star. In order to analyze the effect of color temperature in star sensor, the model of stellar spectrum was presented in this paper. And the position errors of star, which were caused by different stellar spectra, were calculated in an optical system of star sensor. The results show that the star position errors are not remarkable near the optical center. And the effect of color temperature could be minimized by reducing the working wavelength range of optical system, but the spot intensity would be lower at the same time. For example, iftbe working wavelength range is reduced from 300 -1 100 nm to 400 -800 nm, the single star position errors will be 0.042 2″, 1.965 2″ and 3.389 1″ when the field view are （0°,0°）, （0°,2°） and （0°,4°） correspondingly, which are about 54%, 65%and 70%of the original errors. And the spot intensities are about 58%, 62%, 63% and 51% of the original when color temperatures of star are 9 600 K, 7 600 K, 5 600 K and 3 600 K correspondingly.

关 键 词：星敏感器 色差 恒星光谱 恒星定位误差 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]