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CCD noise effects on position accuracy of star sensor

ZHANG Hui1,2,YUAN Jia-hu1,LIU En-hai1(1.The Institute of Optics and Electronics,the Chinese Academy of Sciences,Chengdu 610209,China; 2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China)  
Measurement accuracy of star point is an important character of star sensor accuracy,and it is restricted by optical system error,CCD image sensor noise,circuit noise,arithmetic,etc.Image sensor noise is not negligible,but it is studied rarely.So noise of TH7890M CCD chip,which was used for developing star sensor,was calculated quantitatively.Then based on the subpixel centroid arithmetic,RMS error of different noises was deduced respectively according to respective different noises distribution regular.At last,CCD centroid position accuracy model was received by synthesis.The results show that TH7890M CCD chip has three main noises,i.e.readout noise,photon shot noise and random noise caused by photoresponse nonuniformity,and the preceding two are the main factors which affect star sensor accuracy.For star position estimation,CCD noises can achieve accuracy level of 1/40 pixel for a 6 magnitude stars.
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