The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Gautam D. Badhwar - One of the best experts on this subject based on the ideXlab platform.
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The Radiation Environment in Low-Earth Orbit
Radiation Research, 2006Co-Authors: Gautam D. BadhwarAbstract:The radiation environment in Low-Earth Orbit is a complex mixture of galactic cosmic radiation, particles of trapped belts and secondary particles generated in both the spacecraft and Earth's atmosphere. Infrequently, solar energetic particles are injected into the Earth's magnetosphere and can penetrate into Low-Earth Orbiting spacecraft. In this paper, the sources of charged-particle radiation that contribute significantly to radiation exposure on manned spacecraft are reviewed briefly, and estimates of expected dose rate for the upcoming International Space Station that are based on measurements made on the Russian Mir Orbital station are provided.
Lawrence W Townsend - One of the best experts on this subject based on the ideXlab platform.
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radiation protection guidance for activities in Low Earth Orbit
Advances in Space Research, 2002Co-Authors: Lawrence W TownsendAbstract:Abstract Scientific Committee 75 (SC 75) of the National Council on Radiation Protection and Measurements (NCRP) was assembled for the purpose of providing guidance to NASA concerning radiation protection in Low-Earth Orbit. The report of SC 75 was published in December 2000 as NCRP Report No. 132. In this presentation an overview of the findings and recommendations of the committee report will be presented.
Bo Li - One of the best experts on this subject based on the ideXlab platform.
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Performance study of Low Earth-Orbit satellite systems
IEEE Transactions on Communications, 1994Co-Authors: Aura Ganz, Yebin Gong, Bo LiAbstract:Considerable interest has been focusing on the possibility of employing a large number of Low Earth Orbit (LEG) satellites to provide an overall global coverage. However, there has been no performance study of such systems. The authors investigate the performance of Low Earth Orbit-satellite systems in terms of the system capacity, the average number of beam-to-beam handoffs and satellite-to-satellite handoffs the channel occupancy distribution and the average call drop probability. These performance measures are obtained as a function of: (1) the network constellation, (2) the satellite speed, (3) the cell size, and (4) the average transaction duration. These metrics are exemplified on the Iridium system. The results derived provide useful and simple tools for system design as well as for system analysis. >
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Performance study of Low Earth-Orbit satellite systems
IEEE Transactions on Communications, 1994Co-Authors: Aura Ganz, Yebin Gong, Bo LiAbstract:Considerable interest has been focusing on the possibility of employing a large number of Low Earth Orbit (LEG) satellites to provide an overall global coverage. However, there has been no performance study of such systems. The authors investigate the performance of Low Earth Orbit-satellite systems in terms of the system capacity, the average number of beam-to-beam handoffs and satellite-to-satellite handoffs the channel occupancy distribution and the average call drop probability. These performance measures are obtained as a function of: (1) the network constellation, (2) the satellite speed, (3) the cell size, and (4) the average transaction duration. These metrics are exemplified on the Iridium system. The results derived provide useful and simple tools for system design as well as for system analysis. >
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Performance study of Low Earth-Orbit satellite systems
Proceedings of ICC '93 - IEEE International Conference on Communications, 1993Co-Authors: Aura Ganz, Bo Li, Yebin GongAbstract:The performance of Low-Earth-Orbit satellite systems is investigated in terms of the average number of beam-to-beam handoffs, the average number of satellite-to-satellite handoffs, the channel occupancy distribution, and the average call drop probability. These performance measures are obtained as a function of: 1) the network constellation; 2) the satellite speed; 3) the cell size; and 4) the average transaction duration. These metrics are illustrated on the Iridium system. The results derived provide useful and simple tools for system design, as well as for system analysis.
Aura Ganz - One of the best experts on this subject based on the ideXlab platform.
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Performance study of Low Earth-Orbit satellite systems
IEEE Transactions on Communications, 1994Co-Authors: Aura Ganz, Yebin Gong, Bo LiAbstract:Considerable interest has been focusing on the possibility of employing a large number of Low Earth Orbit (LEG) satellites to provide an overall global coverage. However, there has been no performance study of such systems. The authors investigate the performance of Low Earth Orbit-satellite systems in terms of the system capacity, the average number of beam-to-beam handoffs and satellite-to-satellite handoffs the channel occupancy distribution and the average call drop probability. These performance measures are obtained as a function of: (1) the network constellation, (2) the satellite speed, (3) the cell size, and (4) the average transaction duration. These metrics are exemplified on the Iridium system. The results derived provide useful and simple tools for system design as well as for system analysis. >
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Performance study of Low Earth-Orbit satellite systems
IEEE Transactions on Communications, 1994Co-Authors: Aura Ganz, Yebin Gong, Bo LiAbstract:Considerable interest has been focusing on the possibility of employing a large number of Low Earth Orbit (LEG) satellites to provide an overall global coverage. However, there has been no performance study of such systems. The authors investigate the performance of Low Earth Orbit-satellite systems in terms of the system capacity, the average number of beam-to-beam handoffs and satellite-to-satellite handoffs the channel occupancy distribution and the average call drop probability. These performance measures are obtained as a function of: (1) the network constellation, (2) the satellite speed, (3) the cell size, and (4) the average transaction duration. These metrics are exemplified on the Iridium system. The results derived provide useful and simple tools for system design as well as for system analysis. >
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Performance study of Low Earth-Orbit satellite systems
Proceedings of ICC '93 - IEEE International Conference on Communications, 1993Co-Authors: Aura Ganz, Bo Li, Yebin GongAbstract:The performance of Low-Earth-Orbit satellite systems is investigated in terms of the average number of beam-to-beam handoffs, the average number of satellite-to-satellite handoffs, the channel occupancy distribution, and the average call drop probability. These performance measures are obtained as a function of: 1) the network constellation; 2) the satellite speed; 3) the cell size; and 4) the average transaction duration. These metrics are illustrated on the Iridium system. The results derived provide useful and simple tools for system design, as well as for system analysis.
Morton H Litt - One of the best experts on this subject based on the ideXlab platform.
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atomic oxygen resistant coatings for Low Earth Orbit space structures
Journal of Materials Science, 1995Co-Authors: S. Packirisamy, David Schwam, Morton H LittAbstract:This review presents research in the area of polymeric coatings developed for protecting Low Earth Orbit (LEO) space structures from atomic oxygen. FolLowing a brief description of the LEO environment, ground-based simulation facilities for atomic oxygen and evaluation of protective coatings are discussed. Atomic oxygen resistant coatings based on different polymeric systems such as fluorinated polymers, silicones, poly (carborane-siloxane)s and decarborane-based polymers are presented. Finally, the performances of different coating systems are compared and the scope for further research to improve the performance of some of the coating systems is discussed.
