Results 131 to 140 of about 306 (171)
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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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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
Haopeng Zhang, Zhiguo Jiang
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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
Xinguo Wei, Jian Li, Guangjun Zhang
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Subpixel centroiding algorithm for EMCCD star tracker
SPIE Proceedings, 2008 Star tracker is the most precision attitude measurement instrument of spacecrafts, which plays a very important role in attitude measurement and control system. The technology of star tracker based on CCD is very popular. Unfortunately, with a CCD system, a single integration period for the entire sensor is necessitated.
Yufeng Li, Dongmei Li, Yanbo Liang
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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.
Xinyuan Qian, Shoushun Chen
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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.
Xinyuan Qian, Shoushun Chen
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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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Centroid Locating for Star Image Object by FPGA
Advanced Materials Research, 2011Fast and accurately centroid locating can makes the star image recognition more efficient. The Gauss curve fitting method has higher accurate than traditional centroid locating. The process of centroid locating was investigated with the parallel character of FPGA. First, the star image was divided with the method of average threshold.
Hao Jiang, Xiao Yu Fan
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