Results 241 to 250 of about 1,366,151 (284)

Optimization method for star recognition of LAPAN star sensor

AIP Conference Proceedings, 2021
LAPAN-A3/IPB satellite carries a star sensor using a star catalog containing selected star data with identity-based clustering methods, namely Density-based Spatial Clustering of Application with Noise (DBSCAN), a visual magnitude-based filtering method and serial search method in the star recognition process.
D. E. Amin, M. Taufik, M. A. Saifuddin
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Rapid Star Tracking Algorithm for Star Sensor

IEEE Aerospace and Electronic Systems Magazine, 2009
A rapid star tracking algorithm is proposed. In order to speed up the tracking, three techniques includng parallel star centroiding, sorting, and star catalogue partition are designed for three time-consuming portions in tracking algorithms. The parallel star centroiding is implemented with Field Programmable Gate Array (FPGA) which avoid image storage
null Jie Jiang, null Guangjun Zhang, null Xinguo Wei, null Xiao Li   +3 more
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Rapid star acquisition algorithm in star sensor

2008 International Conference on Information and Automation, 2008
A new rapid star acquisition method is presented. At first, the characteristic of digital star image is analyzed and the thresholding method for image segmentation is discussed. By use of the optimal thresholding method, the practicable automatic threshold is found.
null Yufeng Li, null Rongkun Xue, null Fei Liang   +2 more
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The Mariner Spacecraft Star Sensors

Applied Optics, 1970
The development history of the star sensors used on the Mariner spacecraft is traced, and design and performance details are described. The electrooptically controlled sensor, which was developed for the 1964 Mariner IV Mars mission, was modified for the 1967 Mariner V Venus mission to withstand the intense planetary illumination.
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Parameters optimization of image sensor for star sensors

2017 IEEE International Conference on Imaging Systems and Techniques (IST), 2017
A star sensor realizes 3-axis attitude measurement by star imaging and star recognition, and is widely used for the spacecraft. Image sensor is the core device achieving photoelectric conversion (P-E) in the star sensor and its parameters such as exposure time and gain affect the performance of accuracy and dynamic.
Yuanfang Liao, Xinguo Wei, Jian Li, Gangyi Wang   +3 more
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Star image fusion and star recognition of multi-FOV star sensor

Proceedings of 2014 IEEE Chinese Guidance, Navigation and Control Conference, 2014
A star image fusion method based on coordinate transformation is presented for a multi-FOV star sensor. By using coordinate transformation, simulated star images are generated and images from different FOVs are fused in the same coordinate system. Star image fusion is combined with triangle algorithm which is widely applied, and the star recognition ...
Junpeng Hua, Tao Zhang, Hailong Zhu
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The Blurred Stars Image Preprocessing Technique of Star Sensor

2012 Symposium on Photonics and Optoelectronics, 2012
When the star sensor with high dynamic rotation, blurred image preprocessing technique of the star sensor is need to discuss in detailed. Firstly, the motion-blurred image model in star sensor is given. Then, applying sub-windows technique to improve the dynamics of the star sensor and dynamic compensation for the area starlight reached, which adopt ...
Xiao fang Shen, Chao shan Liu
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Study on guide star selection for infrared star sensors

SPIE Future Sensing Technologies, 2019
Star sensors achieve very accurate attitudes for space vehicles by comparing observed stars in their field of view with the cataloged guide stars. Guide star selection is a key work during the star sensor designing. Infrared star sensor provides accuracy navigation information to air vehicles which fly near the ground in the atmosphere.
Feng Wu, Ruxi Xiang, Qingquan Xu, Jie Zhou, Xiu Yang   +4 more
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Star Detectability Analysis of Daytime Star Sensor

Journal of the Korean Society for Aeronautical & Space Sciences, 2005
This paper discusses the daytime atmospheric conditions and the possibility of daytime star detection with the purpose of practical use of the star sensor for daylight navigation. In order to estimate the daytime atmospheric data, we use the standard atmospheric model (LOWTRAN 7), from which atmospheric transmittance and radiance from background sky ...
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An Autonomous Predicted Star Locations Algorithm for Star Sensor

Applied Mechanics and Materials, 2014
The larger area threshold scan window in star image is scanned with conventional star tracking algorithm under large maneuvering of the vehicle. This results that the number of calculating angular separation between two stars is increased. So the update rate of star sensor is decreased and the feasibility of errors star locations is increased.
Xun Jiang Zheng, Guang Jun Zhang, Bao Hua Li   +2 more
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