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Proceedings Paper

Active pixel sensor geometrical characteristic effects on star image subdivided locating accuracy for star tracker
Author(s): Jie Li; Jinguo Liu; Zhihang Hao
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Paper Abstract

Active pixel sensor (APS) star tracker becomes an investigated hotspot because of its technical advantages. And centroid algorithm is a subpixel method proper to star position calculation because of its high accuracy and simplicity. When centroid algorithm is applied on APS star tracker, APS pixel geometrical characteristics might effect on star image position accuracy. Because the amplifier circuit and other function circuits inter pixel of APS take up some pixel area, the Fill Factor is less than 100%. Moreover, the active sensitive area has a certain geometrical shape, such as square, rectangle and L shape. The Fill Factor of pixel influences on star image subdivided locating accuracy when using centioid algorithm. In this paper, we have analyzed all pixel geometrical characteristics influence on the star position accuracy. From simulation experiments, we can conclude that Fill factor and pixel geometric shape influence on star position accuracy. The star locating error increased when Fill Factor decreased, and different geometrical shape of active sensitive area of pixel can make different influence on star location accuracy, the symmetrical sensitive area in x or y axis have symmetrical location error in the same axis.

Paper Details

Date Published: 2 February 2006
PDF: 9 pages
Proc. SPIE 6031, ICO20: Remote Sensing and Infrared Devices and Systems, 60310C (2 February 2006); doi: 10.1117/12.667919
Show Author Affiliations
Jie Li, Changchun Univ. (China)
Changchun Institute of Optics, Fine Mechanics and Physics (China)
Jinguo Liu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Zhihang Hao, Changchun Institute of Optics, Fine Mechanics and Physics (China)


Published in SPIE Proceedings Vol. 6031:
ICO20: Remote Sensing and Infrared Devices and Systems
Jingshan Jiang; O. Yu. Nosach; Jiaqi Wang, Editor(s)

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