Sub-pixel location with phase transfer function for star tracker

Jiangbo Xi; Zongxi Song; Wei Gao

doi:10.1117/12.2015091

31 January 2013 Sub-pixel location with phase transfer function for star tracker

Jiangbo Xi, Zongxi Song, Wei Gao

Proceedings Volume 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation; 87590U (2013) https://doi.org/10.1117/12.2015091
Event: International Symposium on Precision Engineering Measurement and Instrumentation 2012, 2012, Chengdu, China

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.

Citation Download Citation

Jiangbo Xi, Zongxi Song, and Wei Gao "Sub-pixel location with phase transfer function for star tracker", Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 87590U (31 January 2013); https://doi.org/10.1117/12.2015091

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