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CMOS APS Noise Effect on Position Accuracy of Star Tracker

SHI Shaolong 1,2 ,YIN Dayi 1 (1.Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China;2.University of Chinese Academy of Sicences,Beijing 100049,China)  
The technology of CCD as a star sensor starlight detector has been very mature,but the bottleneck is becoming exposed.On the basis of parameters of IBIS5-B-1300A,the article analyzes CMOS APS noise effects on position accuracy of star sensor,obtains the maximum star position accuracy which a CMOS APS sensor can achieve and verifies the theoretical analysis results through modeling and simulation.Then two conclusions are drawn.First,when gauss dispersion radius is 0.7 and the windows size is 5×5,we can obtain optimized subpixel accuracy;Second,Fixed Pattern Noise (FPN) has the greatest effect on the accuracy of centroid algorithm.This article provides a theoretical basis and support for the selection of the starlight detector for a star sensor system.
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