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Exposure Time Optimization for Highly Dynamic Star Trackers

Under highly dynamic conditions, the star-spots on the image sensor of a star tracker move across many pixels during the exposure time, which will reduce star detection sensitivity and increase star location errors. However, this kind of effect can be compensated well by setting an appropriate expos...

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Detalles Bibliográficos
Autores principales: Wei, Xinguo, Tan, Wei, Li, Jian, Zhang, Guangjun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003974/
https://www.ncbi.nlm.nih.gov/pubmed/24618776
http://dx.doi.org/10.3390/s140304914
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author Wei, Xinguo
Tan, Wei
Li, Jian
Zhang, Guangjun
author_facet Wei, Xinguo
Tan, Wei
Li, Jian
Zhang, Guangjun
author_sort Wei, Xinguo
collection PubMed
description Under highly dynamic conditions, the star-spots on the image sensor of a star tracker move across many pixels during the exposure time, which will reduce star detection sensitivity and increase star location errors. However, this kind of effect can be compensated well by setting an appropriate exposure time. This paper focuses on how exposure time affects the star tracker under highly dynamic conditions and how to determine the most appropriate exposure time for this case. Firstly, the effect of exposure time on star detection sensitivity is analyzed by establishing the dynamic star-spot imaging model. Then the star location error is deduced based on the error analysis of the sub-pixel centroiding algorithm. Combining these analyses, the effect of exposure time on attitude accuracy is finally determined. Some simulations are carried out to validate these effects, and the results show that there are different optimal exposure times for different angular velocities of a star tracker with a given configuration. In addition, the results of night sky experiments using a real star tracker agree with the simulation results. The summarized regularities in this paper should prove helpful in the system design and dynamic performance evaluation of the highly dynamic star trackers.
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spelling pubmed-40039742014-04-29 Exposure Time Optimization for Highly Dynamic Star Trackers Wei, Xinguo Tan, Wei Li, Jian Zhang, Guangjun Sensors (Basel) Article Under highly dynamic conditions, the star-spots on the image sensor of a star tracker move across many pixels during the exposure time, which will reduce star detection sensitivity and increase star location errors. However, this kind of effect can be compensated well by setting an appropriate exposure time. This paper focuses on how exposure time affects the star tracker under highly dynamic conditions and how to determine the most appropriate exposure time for this case. Firstly, the effect of exposure time on star detection sensitivity is analyzed by establishing the dynamic star-spot imaging model. Then the star location error is deduced based on the error analysis of the sub-pixel centroiding algorithm. Combining these analyses, the effect of exposure time on attitude accuracy is finally determined. Some simulations are carried out to validate these effects, and the results show that there are different optimal exposure times for different angular velocities of a star tracker with a given configuration. In addition, the results of night sky experiments using a real star tracker agree with the simulation results. The summarized regularities in this paper should prove helpful in the system design and dynamic performance evaluation of the highly dynamic star trackers. MDPI 2014-03-11 /pmc/articles/PMC4003974/ /pubmed/24618776 http://dx.doi.org/10.3390/s140304914 Text en © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
Wei, Xinguo
Tan, Wei
Li, Jian
Zhang, Guangjun
Exposure Time Optimization for Highly Dynamic Star Trackers
title Exposure Time Optimization for Highly Dynamic Star Trackers
title_full Exposure Time Optimization for Highly Dynamic Star Trackers
title_fullStr Exposure Time Optimization for Highly Dynamic Star Trackers
title_full_unstemmed Exposure Time Optimization for Highly Dynamic Star Trackers
title_short Exposure Time Optimization for Highly Dynamic Star Trackers
title_sort exposure time optimization for highly dynamic star trackers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003974/
https://www.ncbi.nlm.nih.gov/pubmed/24618776
http://dx.doi.org/10.3390/s140304914
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AT tanwei exposuretimeoptimizationforhighlydynamicstartrackers
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