Results 91 to 100 of about 543,396 (133)
Comparison of PSF fitting methods for determining centroids of stars
, 2013 This paper shows a comparison of four fitting models used in order to calculate the centroids for twelve stars. The offsets for each coordinate are calculated with respect to the mean of the coordinates for varying aperture sizes. The computed offsets are then compared to determine if there was any effect from the magnitude of the star or the star's ...
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Gaussian Analytic Centroiding method of star image of star tracker
Advances in Space Research, 2015Abstract The energy distribution of an actual star image coincides with the Gaussian law statistically in most cases, so the optimized processing algorithm about star image centroiding should be constructed also by following Gaussian law. For a star image spot covering a certain number of pixels, the marginal distribution of the gray accumulation on ...
Haiyong Wang +4 more
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S-curve centroiding error correction for star sensor
Acta Astronautica, 2014Abstract A star centroiding error is a critical error in determining the accuracy of star sensors. As an important component of the systematic centroiding errors, the S-curve error is known for its well-regulated sine shape in a period of a pixel. On the basis of the frequency domain analysis, the analytical expression of an S-curve error is given in
Jian Li, Xinguo Wei, Guangjun Zhang
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Star Image Simulation and Subpixel Centroiding for an Earth Observing Sensor
IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium, 2018In this paper, a novel solution is introduced for accurate subpixel star centroiding of the focused geostationary Earth observing sensor on a three-axis stabilized satellite. A small 2-dimensional array is utilized to better capture the star spot than the linear array of detectors. The popular center of mass method is used to compute star centroid in a
Zhiguo Jiang
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Universal star centroiding with stepping variant weighting integration
Guangxue Jingmi Gongcheng/Optics and Precision Engineering, 2011In order to solve the centroiding problem of an over exposed star in star image processing,a universal centroiding algorithm was proposed with "first local calculation and then comprehensive integration".First,the existence of the over exposure stars was confirmed with real star images.Then,by analyzing the grey distribution of over exposed stars,the ...
刘太阳 LIU Tai-yang +2 more
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IEEE Transactions on Circuits and Systems for Video Technology, 2016
A star tracker is a critical sensor for determining and controlling the attitude of a satellite. It utilizes a complementary metal–oxide–semiconductor (CMOS)-active pixel sensor to map the star field onto the focal plane. Starlight is measured and star centroids are calculated to estimate attitude knowledge.
Shoushun Chen, Xinyuan Qian
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A star tracker is a critical sensor for determining and controlling the attitude of a satellite. It utilizes a complementary metal–oxide–semiconductor (CMOS)-active pixel sensor to map the star field onto the focal plane. Starlight is measured and star centroids are calculated to estimate attitude knowledge.
Shoushun Chen, Xinyuan Qian
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The Orlicz–Lorentz centroid inequality for star bodies*
Monatshefte für Mathematik, 2022The paper is inspired by the work [\textit{V. H. Nguyen}, Adv. Appl. Math. 92, 99--121 (2018; Zbl 1380.52011)] on Orlicz-Lorentz centroid bodies. The author extends the Orlicz-Lorentz Busemann-Petty centroid inequality for convex bodies due to Nguyen to the more general case of star bodies.
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The LYZ centroid conjecture for star bodies
Science China Mathematics, 2018For the beginning, the authors give a nice review of centroid bodies theory, in particular they formulate the LYZ Conjecture: If \( \phi \in {\mathcal C}\) and \( K \) is a star body in \( {\mathbb R }^n \) that contains the origin in its interior, then the volume ratio \( |\Gamma_{\phi} K| / |K| \) is minimized if and only if \( K \) is an ellipsoid ...
Wu, Denghui, Zhou, Jiazu
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Journal of Real-Time Image Processing, 2012
Nowadays, hardware implementation of image and video processing algorithms on application specific integrated circuit (ASIC) has become a viable target in many applications. Star tracking algorithm is commonly used in space missions to recover the attitude of the satellite or spaceship. The algorithm matches stars of the satellite camera with the stars
Mohsen Azizabadi +2 more
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Nowadays, hardware implementation of image and video processing algorithms on application specific integrated circuit (ASIC) has become a viable target in many applications. Star tracking algorithm is commonly used in space missions to recover the attitude of the satellite or spaceship. The algorithm matches stars of the satellite camera with the stars
Mohsen Azizabadi +2 more
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Information Theoretic Weighting for Robust Star Centroiding
The Journal of the Astronautical Sciences, 2011A statistical methodology for the global and local analysis of star tracker image content is presented that is based on the A-Contrario framework. A level set analysis using this methodology effectively weights signals with a confidence interval based on the information content. Globally this analysis can represent the non-planar noise floor associated
Brien R. Flewelling, Daniele Mortari
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