ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 6, pp. 106-118

Development of algorithms for filtering primary data in a star tracker

S.A. Prokhorova 1 , P.S. Smetanin 1 , A.A. Forsh 1 
1 Space Research Institute RAS, Moscow, Russia
Accepted: 25.10.2018
DOI: 10.21046/2070-7401-2018-15-6-106-118
The paper provides a brief overview of the primary data filters used in the star trackers of the BOKZ family. The algorithm of line filtration as well as the threshold selection mechanism are described in detail. The need to modify the threshold calculation procedure for parrying structural defects arising from the image sensor irradiation in space is considered. The choice of a single-line sliding filter for the optical head of the star tracker based on the CMOS sensor is substantiated. A brief description of the experiments on image sensor irradiation and its subsequent study in the climatic chamber is given. Finally, an experiment on modeling and comparison of line filters with different threshold setting options is described. The efficiency of line filters is compared by the number of filtered pixels, localized objects and the number of recognized stars at the output of the filter module. We conclude that it is possible to parry a significant part of the noise with filters.
Keywords: star tracker, primary filtration, line filter, photodetector, temperature, neutrons, proton events, structural effects, radiation tests
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