Results 261 to 270 of about 32,600 (279)
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SPIE Proceedings, 2016
In this paper, a single pixel star sensor has been introduced, which uses the intensity correlation between the modulation matrix and the voltage values of the optical signals. Though controlling single or multiple the reflective mirror of the spatial light modulator as a pixel, it is given in a rough scan or an accurate imaging of the stars.
Ran Yang +5 more
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In this paper, a single pixel star sensor has been introduced, which uses the intensity correlation between the modulation matrix and the voltage values of the optical signals. Though controlling single or multiple the reflective mirror of the spatial light modulator as a pixel, it is given in a rough scan or an accurate imaging of the stars.
Ran Yang +5 more
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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 +10 more
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<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 +10 more
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A hybrid method for accurate star tracking using star sensor and gyros
Review of Scientific Instruments, 2017Star 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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Improving night sky star image processing algorithm for star sensors
Journal of the Optical Society of America A, 2014In 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 +3 more
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STAR PATTERN RECOGNITION SENSOR OF THE ASTRO TYPE
IFAC Proceedings Volumes, 1992Abstract 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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Lightweight rainfall radiometer STAR aircraft sensor
IEEE International Geoscience and Remote Sensing Symposium, 2003The 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 +8 more
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Design and application of star map simulation system for star sensors
SPIE Proceedings, 2013Modern star sensors are powerful to measure attitude automatically which assure a perfect performance of spacecrafts. They achieve very accurate attitudes by applying algorithms to process star maps obtained by the star camera mounted on them. Therefore, star maps play an important role in designing star cameras and developing procession algorithms ...
Feng Wu +4 more
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A star pattern recognition algorithm for the double-FOV star sensor
IEEE Aerospace and Electronic Systems Magazine, 2015A 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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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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Noise suppression algorithm of short-wave infrared star image for daytime star sensor
Infrared Physics and Technology, 2017Xinguo Wei, Jian Li, Gangyi Wang
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