| Citation: | HE Yiyang, WANG Hongli, FENG Lei, et al. Star spot motion trajectory modeling and error evaluation under large angular velocity[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(8): 1653-1662. doi: 10.13700/j.bh.1001-5965.2018.0762(in Chinese)
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Star spots obtained by the star sensor on the imaging plane will be seriously blurred under large angular velocity, which affects the performance of the star sensor. In order to fully understand the star spot motion blur trajectory and quantitatively evaluate the influence of the star spot motion blur on the star centroid extraction process, this paper firstly establishes the mathematical model of the star spot motion trajectory on the imaging plane. It is derived that the star spot motion blur trajectory on the imaging plane is a part of the circle during the exposure time. Then the energy distribution model of the blurred star spot is established and the star spot centroid coordinate error based on the centroid method is evaluated under the large angular velocity. It is analyzed that the modulus of the star spot centroid error can be approximated to one half of the length of the star spot motion blur trajectory. The simulation results verify the correctness of the conclusions obtained in this paper.
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