Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2017, Vol. 14, No. 3, pp. 67-77
Classification and analysis of errors in estimating coordinates of objects in images of starry sky
M.L. Belichenko
1 , R.V. Bessonov
1 , D.S. Zavgorodniy
2 , I.D. Elyashev
1 , S.A. Prokhorova
1 1 Space Research Institute RAS, Moscow, Russia
2 LOMO JSC, Saint Petersburg, Russia
Accepted: 14.03.2017
DOI: 10.21046/2070-7401-2017-14-3-67-77
The study of errors in determining coordinates of energy centers of star image on the star tracker’s photoreceiver is presented. The total error consists of methodical and noise components, which are identified within the research process. Methodological error appears regardless of the noise superimposed on the image, but its contribution can be minimized if there are optimal focusing parameters. Thus, in addition to classifying this determination errors, it is necessary to determine the optimal parameters of the star tracker focusing. An important step in solving this task was the simulation of objects images. An ideal case was considered - Gaussian distribution and a model taking into account the impact of the lens real characteristics. A number of factors affecting the image, such as stars’ spectral class, the temperature or tracker operation conditions were also analyzed. The final stage of the study was the comparison of the model with experimental data. One of the simulated experiments for the same optical system as in the model was reproduced at one star imitator. This made it possible to compare the results and to assess the high degree of model and experiment correlation.
Keywords: orientation, frames, pixels, noise, photoreceiver, star trackers, star sensors, methodical error, errors, subpixel accuracy
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