基于LED的多色温多星等单星模拟器

LED-Based Single Star Simulator with Multi-Color-Temperature and Multi-Star-Magnitude Output

针对星模拟器与星敏感器观星的色温不匹配对星敏感器光信号定标精度产生的影响,设计了一种基于LED的多色温多星等单星模拟器,采用该系统模拟特定色温的星光用于星敏感器光信号定标,大幅降低了色温非匹配带来的定标误差。从理论上分析了色温非匹配影响星敏感器光信号的定标精度的机理;根据设计指标确定了星模拟器的设计方案,主要解决了光源的选型、多色温多星等单星模拟器驱动和控制系统、色温星等匹配算法、多色温多星等单星模拟器软件设计四项关键技术问题;对多色温多星等单星模拟器进行了标定和性能测试:0等星4000K和3等星7000 K星光的光谱匹配误差分别为4.87%和7.83%,星等等级分别为0.03和2.93;光源稳定后,多色温多星等单星模拟器的平行光管出口Φ100 mm口径内的照度非均匀度为6.5%,均满足设计指标。

A LED-based single star simulator system with multi-color-temperature and multi-star-magnitude output is developed to calibrate star sensor＇s optical signal, and it can significantly diminish the calibration error caused by the non-matching between star simulator＇s color temperature and star sensor＇s detecting color temperature. The mechanism of how color temperature＇s non-matching affects star sensor＇s optical signal calibration accuracy is analyzed. The design scheme of LED-based single star simulator is determined, which is divided into four key issues, the determination of light source, the design of drive circuit and control system, the design of color temperature and star magnitude matching algorithm, and the design of control software. The LED- based single star simulator is calibrated and tested, the spectral matching errors of starlight with 4000 K color temperature, 0 star magnitude and starlight with 7000 K color temperature, 3 star magnitude are 6.37% and 8.76% respectively, and their star magnitudes are 0.03 and 2.93 respectively. The irradiance non-uniformity in φ100 mm area of LED-based single star simulator is 6.5%. They all meet design requirements.