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Parameter Selection and Optical Design of All-day Star Sensor

PAN Yue;WANG Hu;JING Nan;SHEN Yang;XUE Yao-ke;LIU Jie;Xi′an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;  
Detecting a 4.5 magnitude star in the observation height of 10 km,the radiance of stars between 600~1 100 nm was analyzed,the radiance of sky background and the optical transmission of atmosphere were calculated by using Modtran.When the threshold of SNR is 5,typical parameters are selected.With a plane mirror and a silicon material sphere lens,a lighter miniature optical system was designed.The result shows that the optical system spot shape approaches a circle between 600~1 100 nm of full field of view,modulation transfer function approaches perfection and have outstanding image of quality.The Ground-based daytime and nighttime detection SNR of the star tracter is calculated and the detection ability limit is estimated in the threshold 5of SNR,which is 2.5stellar magnitude G star in daytime on the ground and 6at night.
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