19 November 2014 Adaptive and fast focusing technology research based on configurational entropy for high resolution satellites in orbit
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Abstract
Due to the complex launch condition, dynamic space environment, and up to 0.1" high-resolution imaging requirements, automatic focus (AF) technology in orbit has become one of the key technologies to obtain high-quality images for high-resolution imaging satellite, especially for the long focal length, large diameter optical remote sensor. This paper analyzes the focusing criterion theory of the smallest image entropy. For high-resolution optical imaging satellites, we have proposed innovatively an AF method based on configuration entropy focusing criterion. Data show that configurational entropy focusing criterion is more suitable for low-contrast celestial observation targets. For diffraction limited focal ratio and space optical remote sensor with F#=39, focal length detection sensitivity reaches 0.1mm. Configurational entropy focusing technology improves the efficiency of image processing 22k times, which dramatically reduces the number of focusing movements. Adaptive AF with high speed and high precision satisfies imaging requirements of low-contrast targets for space exploration.
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Linghua Guo, "Adaptive and fast focusing technology research based on configurational entropy for high resolution satellites in orbit", Proc. SPIE 9264, Earth Observing Missions and Sensors: Development, Implementation, and Characterization III, 92641V (19 November 2014); doi: 10.1117/12.2084217; https://doi.org/10.1117/12.2084217
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