CAJ | 학술논문

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300～1 100nm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0.042 2"、1.965 2"和3.389 1",约为原来的54%、65%和70%;色温为9 600 K、7 600 K、5 600 K和3 600 K的恒星像斑能量分别约为原来的58%、62%、63%和51%.
색온영향성민감기항성정위정도,운용광선추적방법,연구색온대항성정위정도적영향.재분석불동색온항성광보분포특정적기출상,건립항성광보모형,계산색온차이인기적항성정위오차,계산결과표명:중심시장부근색온차이인기적항성정위오차교시장변연소;통과합리선택광학계통적향응파단,가이감소색온차이인기적항성정위오차,단회손실항성도체탐측기감광면적광능량.례여,당향응파장종300～1 100nm감소위400～800nm시,성민감기시장(0°,0°)、(0°,2°)화(0°,4°)처적단과항성정위오차분별감소위0.042 2"、1.965 2"화3.389 1",약위원래적54%、65%화70%;색온위9 600 K、7 600 K、5 600 K화3 600 K적항성상반능량분별약위원래적58%、62%、63%화51%.
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, if the 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