Results 261 to 270 of about 1,576,156 (288)

Improved TRIAD for star sensor

Proceedings of 2011 International Conference on Computer Science and Network Technology, 2011
TRIAD is an attitude determination algorithm, which only uses two observed vectors to calculate the attitude of spacecrafts. It has disadvantage of asymmetry using the two observed vectors and not making full use of all the observed star vectors captured by the star sensor.
null Chen Feng-gen, null Liang Bin, null Zhang Tao, null Yang Jun   +3 more
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Star Sensor Thermal Mode

SAE Technical Paper Series, 1998
<div class="htmlview paragraph">Results of thermal mode mathematical evaluation and thermal vacuum tests of the star sensor developed for the “Yamal” project were compared. “TERM” software package was used for mathematical evaluation. The comparison of its results with information, obtained during thermal vacuum tests of sensor in shadow shows ...
E. A. Vitrichenko, V. I. Lazarev, V. I. Panferov, Yu. A. Poskonin, N. B. Revzina, A. S. Vasileisky, V. V. Altov, R. M. Kopiatkevich, A. N. Starostin, E. P. Belyavskiy, A. P. Elchin   +10 more
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Improving night sky star image processing algorithm for star sensors

Journal of the Optical Society of America A, 2014
In this paper, the night sky star image processing algorithm, consisting of image preprocessing, star pattern recognition, and centroiding steps, is improved. It is shown that the proposed noise reduction approach can preserve more necessary information than other frequently used approaches. It is also shown that the proposed thresholding method unlike
Mohammad Vali, Arbabmir, Seyyed Mohammad, Mohammadi, Sadegh, Salahshour, Farshad, Somayehee   +3 more
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A hybrid method for accurate star tracking using star sensor and gyros

Review of Scientific Instruments, 2017
Star tracking is the primary operating mode of star sensors. To improve tracking accuracy and efficiency, a hybrid method using a star sensor and gyroscopes is proposed in this study. In this method, the dynamic conditions of an aircraft are determined first by the estimated angular acceleration. Under low dynamic conditions, the star sensor is used to
Jiazhen Lu, Lie Yang, Hao Zhang
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STAR PATTERN RECOGNITION SENSOR OF THE ASTRO TYPE

IFAC Proceedings Volumes, 1992
Abstract A Star Pattern Recognition Sensor (SPRS) system has been designed for autonomous, all stellar attitude determination. The system consists of three optical heads, including the CCD camera, three image processors and an attitude determination processor. The first system, the ASTRO 1, was realized from 1984 to 1987 and launched in November 1989
Ch. Elstner, D. Ratzsch, W. Skarus
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Algorithm for Screening Navigation Stars on Star Sensors

Laser & Optoelectronics Progress, 2021
王海涌 Wang Haiyong, 徐皓 Xu Hao
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Lightweight rainfall radiometer STAR aircraft sensor

IEEE International Geoscience and Remote Sensing Symposium, 2003
The X-Band Lightweight Rainfall Radiometer using synthetic thinned aperture radiometer technology (LRR-X STAR) is an aircraft microwave sensor that is jointly under development by the NASA Goddard Space Flight Center and the University of Michigan. It operates at 10.7 GHz with 86+ simultaneous 2.1/spl deg/ HPBW antenna beams distributed over a /spl ...
Christopher S. Ruf, Caleb Principe, Tom Dod, Brian Gosselin, Bryan Monosmith, Stephen B. Musko, Steven A. Rogacki, Alphonso Stewart, Zhaonan Zhang   +8 more
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A star pattern recognition algorithm for the double-FOV star sensor

IEEE Aerospace and Electronic Systems Magazine, 2015
A reliable attitude determination system is critical to the success of spacecrafts [1]–[3]. As high accuracy and high reliability devices, star sensors play an important role in attitude determination for satellites [4]–[6]. Based on the star images sampled by star sensors, the locations of the star image in the star sensor coordinate system can be ...
Baohua Li, Qi Sun, Tongshuang Zhang
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Inertial Information Based Star Detection for Airborne Star Sensor

SSRN Electronic Journal, 2022
Hongjie Lei, Bin Li, Qing Wei, Yazhou Yue, Xiaokun Ding, Ke Liang, Linfeng Chen, Haijin Yang, Weigang Zhang, Xiaodong Hu   +9 more
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Different types of star identification algorithms for satellite attitude determination using star sensor

Aerospace Systems, 2021
Reza Ghasemi
exaly