Results 11 to 20 of about 306 (171)
Variable-Weighted Grayscale Centroiding and Accuracy Evaluating
Advances in Mechanical Engineering, 2013 Grayscale-weighted centroiding weights the pixel intensity to estimate the center of a circular image region such as a photogrammetric target or a star image.
Mingli Dong +4 more
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Fusion of a priori information and energy distribution for the centroiding method of the star sensor
AIP AdvancesThe star sensor is the most accurate measurement instrument in the spacecraft attitude measurement system, and the accurate centroid of the star point is the basis for ensuring the performance of the star sensor.
Liu Zhang, Bo Sun, He Liu, Guowei Fan
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Hardware Accelerator for Star Centroiding
, 2020 Since the dawn of civilization mankind has gazed upon the night sky and looked for directions. In this modern age, the stars have proved to be a reliable reference point for navigation in space. From small-satellites for gathering weather data to inter-planetary missions like Cassini Orbiter, figuring out the location of a spacecraft has been done ...
Sakib, Nazmus
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IEEE Transactions on Aerospace and Electronic SystemsStar trackers are one of the most accurate celestial sensors used for absolute attitude determination. The devices detect stars in captured images and accurately compute their projected centroids on an imaging focal plane with subpixel precision. Traditional algorithms for star detection and centroiding often rely on threshold adjustments for star ...
Hongrui Zhao +4 more
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A Novel Peak-Shape Aware Approach for Mass Alignment in Mass Spectrometry. [PDF]
Rapid Commun Mass SpectromABSTRACT Rationale In mass spectrometry measurements, mass shifts may be inadvertently introduced due to instrumental drift and calibration inaccuracies, potentially compromising the accuracy of subsequent data analysis. This work presents a novel, label‐free algorithm to improve relative mass alignment between mass spectra.
Vanhemel T +5 more
europepmc +2 more sources
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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Region-confined restoration method for motion-blurred star image of the star sensor under dynamic conditions [PDF]
, 2016 Under dynamic conditions, the centroiding accuracy of the motion-blurred star image decreases and the number of identified stars reduces, which leads to the degradation of the attitude accuracy of the star sensor.
Jiang, Guangwen +5 more
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Hardware Design and Star Selection Algorithm for Arcsecond Pico Star Tracker [PDF]
, 2020 The star tracker estimates pointing knowledge of a satellite in arcsecond accuracy in three axes without apriori knowledge. But star trackers are larger in size, heavier, power hungry and expensive for nanosatellite missions.
Muruganandan VA
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