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Photovoltaic water electrolysis reaching 31.3% solar-to-H<sub>2</sub> conversion efficiency under outdoor operating conditions. [PDF]
Commun EngMartínez JF +3 more
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Implementation of digital tuberculosis information systems: perspectives from 10 high TB burden countries. [PDF]
BMC Infect DisOga-Omenka C +6 more
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Targeting granulosa cells with engineered DFO nanoparticles for the treatment of chemotherapy-induced premature ovarian failure. [PDF]
TheranosticsZhang T +12 more
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Autonomous Star Tracker Performance
57th International Astronautical Congress, 2006Abstract First in NASA's New Frontiers series of missions, the New Horizons spacecraft was successfully launched on January 19, 2006. New Horizons is scheduled to perform a gravity assist at Jupiter on February 28, 2007, arrive at Pluto on July 14, 2015; completing an extended mission to at least one Kuiper Belt Object in subsequent years.
Gabe D. Rogers +7 more
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SPIE Proceedings, 1986
A high precision star tracker has been developed as part of the attitude measurement and control system of the German Roentgen-Satellit ("ROSAT"). A Peltier cooled CCD array in the focal plane of an 82 mm refractive lens is used to measure the position of up to 3 stars within a field of view (FOV) of 5.9° x 4.4°. The position of a fourth reference star
Gunter Lange +2 more
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A high precision star tracker has been developed as part of the attitude measurement and control system of the German Roentgen-Satellit ("ROSAT"). A Peltier cooled CCD array in the focal plane of an 82 mm refractive lens is used to measure the position of up to 3 stars within a field of view (FOV) of 5.9° x 4.4°. The position of a fourth reference star
Gunter Lange +2 more
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A fast recognition algorithm for star identification of star trackers
IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society, 2017This paper focuses on recognizing the correct match of star identification among multiple possible candidates for star trackers. Derived from the perturbation theory, a tolerance criterion is proposed and proved to check the correctness of the candidates.
Xiaochu Wang +4 more
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Applied Optics, 1966
In many applications of star trackers, extremely short acquisition times, as well as accuracy and sensitivity, are required. Tracking systems employing the vidicon as a radiation sensor have been shown to provide the necessary speed of acquisition for such applications.
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In many applications of star trackers, extremely short acquisition times, as well as accuracy and sensitivity, are required. Tracking systems employing the vidicon as a radiation sensor have been shown to provide the necessary speed of acquisition for such applications.
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Protection Scheme for Star Tracker Images
IEEE Transactions on Aerospace and Electronic Systems, 2019Radiation effects in star trackers can cause malfunctions that may lead to the loss of communication with the satellite. This paper presents a scheme to protect star tracker images stored in memory against single event upsets (SEUs). Fault injection and resource utilization reports show that, with the protection technique, 99.98% of the SEUs can be ...
Luis Alberto Aranda +3 more
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Applied Optics, 1986
A computer-controlled star tracker has been built for use in the IR. A small dedicated computer is the active element in a servo loop that moves two small mirrors located in the light path and keeps the light beam centered in the input aperture of an IR heterodyne spectrometer.
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A computer-controlled star tracker has been built for use in the IR. A small dedicated computer is the active element in a servo loop that moves two small mirrors located in the light path and keeps the light beam centered in the input aperture of an IR heterodyne spectrometer.
openaire +2 more sources
Autonomous Star Tracker Development
IFAC Proceedings Volumes, 1992Abstract The attitude control, pointing control, and navigation systems of future advanced spacecraft will be characterized by a high degree of autonomy, very high accuracy, efficient commandability, and fast fault recovery. These characteristics are incompatible with the constraints of conventional star trackers which mandate a-priori definition and
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