Results 1 to 10 of about 543,396 (133)
Star Centroiding Based on Fast Gaussian Fitting for Star Sensors [PDF]
Sensors, 2018 The most accurate star centroiding method for star sensors is the Gaussian fitting (GF) algorithm, because the intensity distribution of a star spot conforms to the Gaussian function, but the computational complexity of GF is too high for real-time ...
Gangyi Wang, Jian Li, Xinguo Wei
exaly +6 more sources
Sieve Search Centroiding Algorithm for Star Sensors
Sensors, 2023 The localization of the center of the star image formed on a sensor array directly affects attitude estimation accuracy. This paper proposes an intuitive self-evolving centroiding algorithm, termed the sieve search algorithm (SSA), which employs the ...
Pravin Singru, Narayan Manjarekar
exaly +6 more sources
Enhancement of the centroiding algorithm for star tracker measure refinement
Acta Astronautica, 2003 Abstract The application of the hyperacuity technique to image processing of star trackers is analysed. An analytical study of the error introduced by the centroiding algorithm is presented and it is shown that a systematic contribution and a random one exist.
Domenico Accardo, Giancarlo Rufino
exaly +4 more sources
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
doaj +2 more sources
IEEE Access, 2019 Extracting accurate star centroids in the observed star images is one of the key problems for image navigation of the geosynchronous interferometric infrared sounder (GIIRS) of Fengyun-4A Satellite (FY-4A), the first scientific experimental satellite of ...
Jian Shang, Zhiguo Jiang, Lei Yang
exaly +3 more sources
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
doaj +2 more sources
An Autonomous Predictive Centroiding Algorithm for Star Sensor
Applied Mechanics and Materials, 2011 Of all current methods for measuring spacecraft attitude, the use of star sensors produces the most accurate measurements. Conventional star sensors repeat these processes with Lost-In-Space case. To advance the methods available to solve these problems, this paper presents an autonomous predictive centroiding algorithm for the star sensor.
Bao Hua Li, Jing Li, Xi Jun Chen
openaire +2 more sources
Development of Daytime Observation Model for Star Sensor and Centroiding Performance Analysis [PDF]
Journal of Astronomy and Space Sciences, 2005 A star sensor daytime observation model is developed in order to test the performance of the star sensor useful for daylight application. The centroid errors of the star sensor in the day time application are computed by using the model.
Jakyoung Nah, Yu Yi, Yong Ha Kim
doaj +3 more sources
Real-Time Convolutional-Neural-Network-Based Star Detection and Centroiding Method for CubeSat Star Tracker [PDF]
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
core +4 more sources
Stratospheric temperature measurements from nanosatellite stellar occultation observations of refractive bending [PDF]
Atmospheric Measurement Techniques, 2023 Stellar occultation observations from space can probe the stratosphere and mesosphere at a fine vertical scale around the globe. Unlike other measurement techniques like radiosondes and aircraft, stellar occultation has the potential to observe the ...
D. L. McGuffin +8 more
doaj +1 more source