Method of maximum likelihood estimation of compact group objects location on CCD-frame
DOI:
https://doi.org/10.15587/1729-4061.2014.28028Keywords:
CCD frame, maximum likelihood method, compact group of asteroids, location estimation, CoLiTecAbstract
The urgency of developing computational methods of high-accuracy location estimation of nearby objects on a digital image is caused by a significant increase in penetrating power of optical systems. In this regard, the difficulty of achieving the required observation accuracy of nearby objects with statistically dependent images significantly increases.
The paper proposes a method that allows with potential accuracy to assess the location of several nearby objects on the CCD frame. Using sub-pixel Gaussian model for object image, high measurement accuracy was achieved. The method is based on the maximum likelihood method, which reduces the computational complexity of the method. The developed method can be used in operational automated asteroids detection systems, for example, in the CoLiTec program, to assess the location of several nearby statistically dependent objects.
This method is already being used in the operational automated asteroids detection system CoLiTec. The method has shown high accuracy in estimating the location of several nearby statistically dependent objects [14].
Implementation of the proposed method in CoLiTec software has increased the measurement accuracy of objects. Due to this, program users have improved their rating by the number of measurements of small solar system bodies. Namely, in 2012, among the most productive world observatories, observatories-users of CoLiTec have taken 9, 13, 22 places. According to the RMSD parameter, in pixels, objects location estimates, observatories-partners of CoLiTec for the 2012 have: ISON-NM Observatory (H15) – 0.25 pixels (5th place), Andrushevsky Astronomical Observatory (A50) - 0.23 pixels (3 place), ISON-Kislovodsk Observatory - 0.23 pixels (3rd place). Based on the average module of residuals, observatories-partners of CoLiTec also take leading positions in their class of telescopes. In 2012, this indicator was 0.061” (H15) and 0.06” (A50). So, according to this indicator, observatories H15 and A50 have taken 3 and 2 places among small aperture telescopes.
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Copyright (c) 2014 Любовь Олеговна Михайлова, Вадим Евгеньевич Саваневич, Наталья Сергеевна Соковикова, Михаил Михайлович Безкровный, Сергей Васильевич Хламов, Артём Витальевич Погорелов
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