Results 141 to 150 of about 6,166,267 (187)

Satellite Laser Communication Activities in NICT

2018 Progress in Electromagnetics Research Symposium (PIERS-Toyama), 2018
National Institute of Information and Communications Technology (NICT)has initiated several R&D projects related to satellite laser communications. In this paper we present some of the recent activities in the field, including the Small Optical TrAnsponder (SOTA)for LEO satellites, High-speed Communication with Advanced Laser Instrument (HICALI)for GEO
Dimitar R. Kolev, Alberto Carrasco-Casado, Hideki Takenaka, Yasushi Munemasa, Phuc V. Trinh, Yoshihiko Saito, Hiroo Kunimori, Yoshisada Koyama, Kenji Suzuki, Toshihiro Kubooka, Morio Toyoshima   +10 more
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Satellite Laser Communication and Adaptive Optics

Imaging and Applied Optics Congress, 2020
Adaptive optics enables higher data rates for satellite laser communication. It has recently been demonstrated and several future missions will use AO. There are challenges that AO needs to address to be widely used.
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Laser satellite communications with adaptive optics

SPIE Proceedings, 2005
Laser satellite communications (LCS) appear to have potential applications in the future global communication network. However, bidirectional ground-to-space link performance is degraded by atmospheric turbulence. This paper presents the simulations results of laser uplink and downlink propagation through atmospheric turbulence based on turbulence ...
Chueh Ting, David G. Voelz, Michael K. Giles   +2 more
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Power versus stabilization for laser satellite communication

Applied Optics, 1999
To establish optical communication between any two satellites, the lines of sight of their optics must be aligned for the duration of the communication. The satellite pointing and tracking systems perform the alignment. The satellite pointing systems vibrate because of tracking noise and mechanical impacts (such as thruster operation, the antenna ...
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Inter-satellite laser communication system

2008 International Conference on Computer and Communication Engineering, 2008
Laser communication links in space are attractive alternatives to present-day microwave links. This paper firstly makes an overview of an optical inter-satellite communication terminal. This terminal contains several modules such as transmit assembly, receive assembly, diplexers, mirrors assembly, acquisition and tracking sensor optics, etc.
K. Shantha Lakshmi, M.P. Senthil Kumar, K.V.N. Kavitha   +2 more
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Bandwidth maximization for satellite laser communication

IEEE Transactions on Aerospace and Electronic Systems, 1998
Free space optical communication between satellites networked together can make possible high speed communication between different places on Earth. The basic free space optical communication network includes at least two satellites. In order to communicate between them, the transmitter satellite must track the beacon of the receiver satellite and ...
Arnon Shlomi, Stanley R. Rotman, Norman S. Kopeika   +2 more
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Optimization of a laser satellite communication system with an optical preamplifier

Journal of the Optical Society of America A, 2004
We derive a model that optimizes the performance of a laser satellite communication link with an optical preamplifier in the presence of random jitter in the transmitter-receiver line of sight. The system utilizes a transceiver containing a single telescope with a circulator.
Anna, Polishuk, Shlomi, Arnon
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Satellite laser communication with Brandon orbits

2011 International Conference on Space Optical Systems and Applications (ICSOS), 2011
We estimate worldwide zenith attenuation for 10 micron laser satellite communication systems. The attenuation may be lowered with the aid of switched ground diversity. However, real satellite systems tend to sharply raise the attenuation with low elevation angles and long atmospheric path lengths. Brandon Molniya satellite concepts are expected to give
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Free space satellite laser communication

2000 Digest of the LEOS Summer Topical Meetings. Electronic-Enhanced Optics. Optical Sensing in Semiconductor Manufacturing. Electro-Optics in Space. Broadband Optical Networks (Cat. No.00TH8497), 2002
I present applications of satellite laser communications. Free space optical communication between satellites networked together can make possible high speed communication between different places on the Earth. The advantages of an optical communication system instead of a microwave communication system in free space are: 1) smaller size and weight, 2)
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Climate Satellites with Laser Communication Links

28th AIAA International Communications Satellite Systems Conference (ICSSC-2010), 2010
Low cost, high data rate laser Earth Observation Satellites will be valuable for monitoring global warming. A global warming model is described functionally: it indicates considerable warming at Northern Latitudes. We use a cloud attenuation model derived from key Italsat results to find laser cloud attenuation for satellite-ground links.
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