Results 11 to 20 of about 543,396 (133)
Processing Centroids of Smearing Star Image of Star Sensor [PDF]
Mathematical Problems in Engineering, 2014 A novel method was presented for increasing the accuracy of subpixel centroid estimation for smearing star image. Model of the smearing trajectory of smearing star was built. It helped to study the analytical form of the errors, caused by image smearing, for centroid estimation.
Yufu Liao +3 more
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The Measurement of PSF Ellipticity of an Unobstructed Off-Axis Space Telescope: Error Analysis
IEEE Access, 2021 It is an effective method to detect weak gravitational lensing (WL) in the universe by measuring ellipticities of galaxies via astronomical telescopes. Optical properties of telescopes are critical to WL detections.
Kuo Fan +4 more
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Centroid determination hardware algorithm for star trackers
International Journal of Sensor Networks, 2020 The execution of centroid extraction algorithms using a microprocessor consumes considerable resources when compared to the other steps involved in star trackers. This paper presents a method to identify star centroids in star trackers by pre-processing the pixels using a field-programmable gate array (FPGA) directly in the stream transmitted by an ...
Gabriel Mariano Marcelino +3 more
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Engineering, 2023 Subpixel localization techniques for estimating the positions of point-like images captured by pixelated image sensors have been widely used in diverse optical measurement fields.
Haiyang Zhan +6 more
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Star centroiding error compensation for intensified star sensors
Optics Express, 2016 A star sensor provides high-precision attitude information by capturing a stellar image; however, the traditional star sensor has poor dynamic performance, which is attributed to its low sensitivity. Regarding the intensified star sensor, the image intensifier is utilized to improve the sensitivity, thereby further improving the dynamic performance of ...
Jie, Jiang +4 more
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Accurate Star Centroid Detection for the Advanced Geosynchronous Radiation Imager of Fengyun-4A
IEEE Access, 2018 Star observation can be used for the image navigation of certain instruments aboard the three-axis stabilized geostationary satellites. How to extract the accurate star centroids in the observed star images is one of the key problems.
Haopeng Zhang +8 more
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Exposure Time Optimization for Highly Dynamic Star Trackers
Sensors, 2014 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.
Xinguo Wei +3 more
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Sensors, 2017 The simultaneous extraction of optical navigation measurements from a target celestial body and star images is essential for autonomous optical navigation.
Hao Wang, Jie Jiang, Guangjun Zhang
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An Adaptive Multi-Scale Star Centroid Localization Algorithm with Bayesian Iterative Weighting and Performance Analysis [PDF]
ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information SciencesStar centroid localization accuracy fundamentally limits spacecraft attitude determination precision. Existing methods face a critical accuracy-efficiency trade-off: traditional intensity-weighted approaches achieve computational efficiency (<1 ms ...
T. Zhou +6 more
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Improved centroid extraction algorithm for autonomous star sensor
IET Image Processing, 2015 An improved centroid extraction algorithm for autonomous star sensor is proposed in this study, which focuses on the improvements of the location accuracy of stars and the speed of the centroid extraction. First, the coarse positioning of stars is carried out to achieve the dispersive regions of the stars quickly.
Liyan Luo, Lu-ping Xu, Hua Zhang 0015
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