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Proceedings Paper

Sub-pixel location with phase transfer function for star tracker
Author(s): Jiangbo Xi; Zongxi Song; Wei Gao
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Paper Abstract

Star tracker has been widely used as a precise and reliable device for the attitude measuring of a spacecraft. The accuracy of star location will affect the accuracy of star identification and finally the accuracy of attitude measurement. This paper proposed a novel method to locate the star position with the phase transfer function (PTF). The numerical expressions are deduced with the diffraction model of the star point in 1-D and given directly in 2-D. Then calculation is performed and the accuracy is better than 2.1% pixels (SNR=20) with a 3×3 window of airy disk, which is higher than the traditional centroid method. Different sizes of the airy disk from 3 to 6 are simulated with PTF method and we find that the optimal window size is 3 to 5. Finally the Additive Gaussian Noise with SNR from 2 to 40 is introduced to evaluate the novel method and compare it with the traditional centroid method. The accuracy of the new method can reach better than 2.5% pixels and it is much robust than the traditional centroid method, which proves that the method we proposed has a good performance under the noise environment.

Paper Details

Date Published: 31 January 2013
PDF: 7 pages
Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 87590U (31 January 2013); doi: 10.1117/12.2015091
Show Author Affiliations
Jiangbo Xi, Xi'an Institute of Optics and Precision Mechanics (China)
Graduate School of the Chinese Academy of Sciences (China)
Zongxi Song, Xi'an Institute of Optics and Precision Mechanics (China)
Wei Gao, Xi'an Institute of Optics and Precision Mechanics (China)


Published in SPIE Proceedings Vol. 8759:
Eighth International Symposium on Precision Engineering Measurement and Instrumentation
Jie Lin, Editor(s)

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