Centroid location of star sub-pixels based on iterative Lagrange interpolation

Chao Zeng; Kun Gao; Yongtian Zhang; Xiaomei Chen; Yaqing Xiao

doi:10.1117/12.2648403

23 January 2023 Centroid location of star sub-pixels based on iterative Lagrange interpolation

Chao Zeng, Kun Gao, Yongtian Zhang, Xiaomei Chen, Yaqing Xiao

Proceedings Volume 12557, AOPC 2022: Optical Sensing, Imaging, and Display Technology; 125570W (2023) https://doi.org/10.1117/12.2648403
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

One of the key technologies of high precision star sensor is to improve the star location accuracy of star sensor, which plays an important role in astronomical navigation. Because the traditional star location algorithm is based on the standard Gaussian distribution model, the location accuracy is poor when the star energy is not Gaussian distribution. According to the different imaging models of stars by star sensors, a subpixel localization algorithm based on iterative Lagrange interpolation is proposed to improve the centroid extraction accuracy of non-Gaussian stars. Experimental results show that the accuracy of the proposed method is up to 0.01pixel, and the average error of the proposed method is 49.38% higher than that of the traditional method.

Citation Download Citation

Chao Zeng, Kun Gao, Yongtian Zhang, Xiaomei Chen, and Yaqing Xiao "Centroid location of star sub-pixels based on iterative Lagrange interpolation", Proc. SPIE 12557, AOPC 2022: Optical Sensing, Imaging, and Display Technology, 125570W (23 January 2023); https://doi.org/10.1117/12.2648403

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KEYWORDS

Stars

Star sensors

Detection and tracking algorithms

Point spread functions

Diffusion

Statistical analysis

Image processing

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