Готові списки джерел за темами / Earth-satellite free space optical links

Добірка наукової літератури з теми "Earth-satellite free space optical links"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Earth-satellite free space optical links"

Chaudhry, Aizaz U., and Halim Yanikomeroglu. "Temporary Laser Inter-Satellite Links in Free-Space Optical Satellite Networks." IEEE Open Journal of the Communications Society 3 (2022): 1413–27. http://dx.doi.org/10.1109/ojcoms.2022.3198391.

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Lim, Hyung-Chul, Jong Uk Park, Mansoo Choi, Chul-Sung Choi, Jae-Dong Choi, and Jongah Kim. "Performance Analysis of DPSK Optical Communication for LEO-to-Ground Relay Link Via a GEO Satellite." Journal of Astronomy and Space Sciences 37, no. 1 (March 2020): 11–18. http://dx.doi.org/10.5140/jass.2020.37.1.11.

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Satellite optical communication has gained significant attention owing to its many quality features (e.g., a larger bandwidth, license free spectrum, higher data rate, and better security) compared to satellite microwave communication. Various experiments have been performed during many space missions to demonstrate and characterize inter-satellite links, downlinks, and uplinks. Korea has also planned to establish an experimental communication system using a geostationary earth orbit (GEO) satellite and the Geochang station as an optical ground station for low Earth orbit (LEO)-to-ground optical relay links. In this study, the performance of inter-satellite communication links and downlinks was investigated for the new Korean experimental communication system in terms of link margin, bit error rate (BER), and channel capacity. In particular, the performance of the inter-satellite links was analyzed based on the receiving apertures and the transmitting power, while that of the downlink was analyzed in terms of atmospheric turbulence conditions and transmitting power. Finally, we discussed two system parameters of receiving aperture and transmitting power to meet the three criteria of link margin, BER, and channel capacity.

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Tiwari, Gayatri. "A Review on Inter-Satellite Links Free Space Optical Communication." Indian Journal of Science and Technology 13, no. 06 (February 14, 2020): 712–24. http://dx.doi.org/10.17485/ijst/2020/v13i06/147998.

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Falodun, S. E., J. S. Ojo, and O. L. Ojo. "Analysis of visibility effects on free space earth-to-satellite optical link based on measurement data in Nigeria." Nigeria Journal of Pure and Applied Physics 9, no. 1 (April 21, 2020): 41–45. http://dx.doi.org/10.4314/njpap.v9i1.8.

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The effect of atmospheric variables on signals propagating from earth to space are of concern in the design and performance of wireless communications systems. Since atmospheric effects which led to atmospheric losses (attenuations, fading and scintillation) are location-dependent, climatological phenomena such as fog, snow, rain, and haze has much effect on Free Space Optical (FSO) and can cause reduction in the link availability. This paper analysed the effect of fog on FSO communication links from earth to satellite links over five selected locations (Ikeja, Akure, Enugu, Jos and Port-Harcourt) in Nigeria. One year (2012) visibility data obtained at Nigeria Meteorological Agency (NIMET) have been used to estimate the specific attenuation caused by fog on FSO communication links in the selected locations. Link margin was deduced in all the five locations. The estimated specific attenuation caused by fog was based on operating frequencies associated with a typical commercial FSO. The result shows that at 352 THz frequency, Ikeja recorded the highest value of about 38.60 dB/km for the specific attenuation due to fog on FSO link followed by Akure with value of about 30.33 dB/km. Enugu recorded the least estimated attenuation of about 14.19 dB/km . The implication of the result is that Ikeja and Akure will suffer more signal loss, while Enugu will suffer less signal loss. Result on link margin performed on FSO link also showed that Ikeja has the highest link margin of -109.79 dB, Port-Harcourt with link margin value of -91.99 dB while Jos experienced lowest link margin of about -37.48 dB. Keywords: Free space optical systems; Fog induced specific attenuation; Earth-space links; Link margin

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Goncalves Teixeira, Mafalda, Julio Ramirez Molina, and Vasco N. G. J. Soares. "Review on Free-Space Optical Communications for Delay and Disruption Tolerant Networks." Electronics 10, no. 13 (July 5, 2021): 1607. http://dx.doi.org/10.3390/electronics10131607.

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The increase of data-rates that are provided by free-space optical (FSO) communications is essential in our data-driven society. When used in satellite and interplanetary networks, these optical links can ensure fast connections, yet they are susceptible to atmospheric disruptions and long orbital delays. The Delay and Disruption Tolerant Networking (DTN) architecture ensures a reliable connection between two end nodes, without the need for a direct connection. This can be an asset when used with FSO links, providing protocols that can handle the intermittent nature of the connection. This paper provides a review on the theoretical and state-of-the-art studies on FSO and DTN. The aim of this review is to provide motivation for the research of an optical wireless satellite network, with focus on the use of the Licklider Transmission Protocol. The assessment presented establishes the viability of these networks, providing many examples to rely on, and summarizing the most recent stage of the development of the technologies addressed.

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Viswanath, Anjitha, Pooja Gopal, Virander Kumar Jain, and Subrat Kar. "Performance enhancement by aperture averaging in terrestrial and satellite free space optical links." IET Optoelectronics 10, no. 3 (June 1, 2016): 111–17. http://dx.doi.org/10.1049/iet-opt.2015.0042.

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He, Wang, Liu, Song, Zhou, Wang, Gao, et al. "Shipborne Acquisition, Tracking, and Pointing Experimental Verifications Towards Satellite-to-Sea Laser Communication." Applied Sciences 9, no. 18 (September 19, 2019): 3940. http://dx.doi.org/10.3390/app9183940.

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Acquisition, tracking, and pointing (ATP) is a key technology in free space laser communication that has a characteristically high precision. In this paper, we report the acquisition and tracking of low-Earth-orbit satellites using shipborne ATP and verify the feasibility of establishing optical links between laser communication satellites and ships in the future. In particular, we developed a shipborne ATP system for satellite-to-sea applications in laser communications. We also designed an acquisition strategy for satellite-to-sea laser communication. In addition, a method was proposed for improving shipborne ATP pointing error. We tracked some stars at sea, achieving a pointing accuracy of less than 180μrad.We then acquired and tracked some low-Earth-orbit satellites at sea, achieving a tracking accuracy of about 20μrad. The results achieved in this work experimentally demonstrate the feasibility of ATP in satellite-to-sea laser communications.

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Gutiérrez-Montor, M., G. A. Yañez-Casas, C. E. Enríquez-Ortiz, and J. J. Hernández-Gómez. "Teletraffic analysis and simulation on FSO systems: the traffic generators approach." Journal of Physics: Conference Series 2475, no. 1 (April 1, 2023): 012003. http://dx.doi.org/10.1088/1742-6596/2475/1/012003.

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Abstract Free Space Optical Communications (FSO) has become an interesting topic to researchers in recent years since the amount of data generated by devices is growing, and it is necessary to use data links that support high bandwidth to transmit them from one device to another. This technology is used to establish not only terrestrial links but also space links. A CubeSat satellite is generally deployed in the Low Earth Orbit (LEO) region. To maintain the altitude, the satellite must have a high orbital speed. For that reason, the time to transmit data between a particular ground station and the CubeSat satellite is limited. On the other hand, the volume, mass, and energy storage capacity are restricted in a CubeSat. The greater the bandwidth capacity of radio frequency links, the greater the demand for volume, mass, and energy they require. For that reason, to transmit a significant amount of data, traditional radio frequency links are not suitable and are becoming replaced by FSO as technology improves. Despite research in physical layer technologies on FSO (modulation schemes, error mitigation techniques, pointing and tracking systems), there is very little research in the literature about data link layer protocols for FSO. Secondly, there is little research to measure the data traffic demand on CubeSat satellites so that a certain data link layer protocol can be selected or adapted to be implemented in an FSO system. This paper presents research to address the issue of teletraffic through the use of traffic generators. The result is the design and development of a traffic generator for a discrete event simulator that will later be used to observe the behavior and to measure the performance of the Selective Repeat ARQ protocol in a simulated satellite FSO link, in order to propose improvements to adapt the protocol to this scenario.

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Wang, Jing, and Bernardo A. Huberman. "An Overview on Deployment Strategies for Global Quantum Key Distribution Networks." Wireless Communications and Mobile Computing 2022 (April 25, 2022): 1–15. http://dx.doi.org/10.1155/2022/9927255.

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We present a comprehensive literature review and comparative study on the deployment strategies of quantum key distribution (QKD) networks for global coverage. The state-of-the-art deployment strategies, including terrestrial QKD via optical fibers, free-space QKD via ground-based fixed links and ground-to-air dynamic links, and satellite QKD, are reviewed and compared in terms of channel loss, interference, distance limit, connection topology, and deployment cost. Selection criteria and deployment strategies are developed to enable a global coverage of QKD networks from intercontinental, long-haul, metro, to access networks.

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Дисертації з теми "Earth-satellite free space optical links"

Ghosna, Fadi Jawdat. "Pulse position modulation coding schemes for optical inter-satellite links in free space." Thesis, University of Huddersfield, 2010. http://eprints.hud.ac.uk/id/eprint/8766/.

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The rapid and significant development of communications links between satellites has made it possible to use various applications such as relay voice, video, multimedia, etc. As a result, a great deal of research has been done in this field during the last few years to reduce power consumption and increase transmission reliability. This thesis is concerned with an analysis of intersatellite links in free space, with optical links using laser sources being considered in particular. It includes a literature survey and a thorough theoretical investigation into designing the model of the link in free space. This thesis describes the novel technique of designing the optical receiver that consists of PIN photodiode as a photodetector, Semiconductor optical amplifier (SOA) and a 3rd order Butterworth filter with central decision detection. In addition, it discusses the use of several different coding schemes for use in such links: multiple pulse position modulation (MPPM); digital pulse position modulation (DPPM); Dicode pulse position modulation (Dicode PPM). This novel technique of an optical receiver is investigated and new work is presented in order to examine the noise performance of this optical receiver and hence determine its sensitivity and the number of photons received for a specified error rate. Further new work is carried out to compare these coding schemes in terms of error weightings and coding efficiency through showing how the PCM error rate is affected by false alarm and erasure errors for MPPM, DPPM and Dicode PPM coding 3, 4, 5 and 6 bits of PCM. An original maximum likelihood sequence detector (MLSD) is presented in this thesis in order to perform these comparisons. In addition, computer simulations models (using MCAD) are performed to compare these three coding schemes operating with 3, 4, 5 and 6 bits of PCM in terms of sensitivity and bandwidth efficiency. These comparisons show that MPPM coding 3, 4, 5 and 6 bits of PCM is the appropriate coding scheme to be used in optical inter-satellite links in free space and PCM data rates of 1 Gbit/s.

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Nguyen, Tam Nguyen Thuc. "Laser beacon tracking for free-space optical communication on small-satellite platforms in low-earth orbit." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/101446.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2015.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 91-94).
Free-space optical (FSO) communication, or laser communication, is capable of providing high-rate communication links, meeting the growing downlink demand of space missions, including those on small-satellite platforms. FSO communication takes advantage of the high-gain nature of narrow laser beams to achieve higher link efficiency than traditional radio-frequency systems. In order for a FSO link to be established and maintained, the spacecraft's attitude determination and control system needs to provide accurate pointing at the optical ground station. However, small satellites, such as CubeSats, have limited ground-tracking capabilities with existing attitude sensors. Miniaturized laser beacon tracking system, on the other hand, has the potential to provide precise ground-based attitude knowledge, enabling laser communication to be accomplished on small-satellite platforms. This thesis details the development of a CubeSat-sized laser beacon camera capable of achieving a sub-milliradian attitude knowledge accuracy with low fade probability during various sky conditions, sufficient to support a high-rate FSO communication link on a CubeSat platform on low-Earth orbit. The high-level Nanosatellite Optical Downlink Experiment (NODE) system architecture, the beacon camera conceptual design as well as prototype development are presented in detail. An end-to-end beacon simulation was constructed to validate the attitude sensing performance of the module under expected atmospheric turbulence and sky brightness conditions. The simulation results show a high-accuracy attitude sensing performance and low fade probability, capable of supporting NODE's laser links.
by Tam Nguyen Thuc Nguyen.
S.M.

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Частини книг з теми "Earth-satellite free space optical links"

Domb, Menachem, and Guy Leshem. "Signal Strength Extrapolation after Crossing an Urban Area." In New Frontiers in Communication and Intelligent Systems, 697–702. Soft Computing Research Society, 2022. http://dx.doi.org/10.52458/978-81-95502-00-4-70.

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Free space wireless signal communication has the capacity and vast spread expansion to provide the right platform to support the growing demand for communication services. The propagation of electronic waves is the core of actual wireless communication links between ground stations and satellite ground communications. However, rain, dust, ground topography, urban surface, and other physical barriers weakened the transmitted signal strength and loss, reducing the quality and completion of the data transfer process. This work focuses on diffraction, weakening, and loss of signals when crossing urban areas surrounded by high buildings. We present a machine learning model for estimating the signal strength after crossing the urban areas. This assessment helps recommend the proper signal strength required when launching the signals towards the end station located in urban surroundings. We use a neural network system that derives patterns and rules from a given dataset containing simulated sampling data and predicts the optimal transmission strength when launched.

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Goldsmith, Jack, and Tim Wu. "How Governments Rule the Net." In Who Controls the Internet? Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195152661.003.0010.

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In 1966 a retired British Major named Paddy Roy Bates took a liking to a small, abandoned concrete platform in the North Sea nicknamed “Rough’s Tower.” Rough’s Tower was a World War II gun tower used by the British to fire at German bombers on their way to London. By 1966, nobody wanted the rusting contraption, so Bates renamed it the “Principality of Sealand” and declared independence from the United Kingdom, six miles away. He awarded himself the title of Prince Roy, and proceeded to issue Sealand passports and Sealand stamps with pictures of his wife, Joan, an ex-beauty queen. Sealand has had a colorful history, but before 1999, nothing suggested that a chunk of concrete and steel off the English coast might have anything to do with the history of the Internet. That year, Bates agreed to let a young man named Ryan Lackey move to Sealand and begin transforming it into a “data haven.” Lackey’s company, “HavenCo,” equipped Sealand with banks of servers, and Internet links via microwave and satellite connections. Borrowing an idea from cyberpunk fiction, HavenCo aimed to rent computer space on Sealand to anyone who wanted to escape the clutches of government. It promised potential clients—porn purveyors, tax evaders, Web gambling services, independence movements, and just about any other government-shy Internet user—that data on Sealand servers would be “physically secure against any legal action.” HavenCo, the company boasted, would be “the first place on earth where people are free to conduct business without someone looking over their shoulder.” HavenCo was the apotheosis of the late 1990s belief in the futility of territorial government in the Internet era. Lackey’s company was premised on the commonplace assumption that governments cannot control what happens beyond their borders, and thus cannot control Internet communications from abroad. “If the king’s writ reaches only as far as the king’s sword, then much of the content of the Internet might be presumed to be free from the regulation of any particular sovereign,” wrote Duke law professor James Boyle, generalizing the point.

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Тези доповідей конференцій з теми "Earth-satellite free space optical links"

Fuchs, Christian, Florian Moll, Juraj Poliak, Andrew Reeves, and Christopher Schmidt. "Optical satellite links at DLR." In Free-Space Laser Communications XXXV, edited by Hamid Hemmati and Bryan S. Robinson. SPIE, 2023. http://dx.doi.org/10.1117/12.2659377.

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Silvestri, Fabrizio, Federico Pettazzi, Martin Eschen, Jeroen J. Boschma, Jochem B. Lutgerink, Geerten F. Kramer, Wim C. Korevaar, Remco den Breeje, Cristina M. Duque, and Niek J. Doelman. "Beam multiplexing for satellite communication optical feeder links." In Free-Space Laser Communications XXXII, edited by Hamid Hemmati and Don M. Boroson. SPIE, 2020. http://dx.doi.org/10.1117/12.2543035.

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Baister, G. "Applications for optical free space links in inter-satellite and intra-satellite communications." In IEE Colloquium on Optical Free Space Communication Links. IEE, 1996. http://dx.doi.org/10.1049/ic:19960195.

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Gopal, Pooja, V. K. Jain, and Subrat Kar. "Modulation techniques used in earth-to-satellite and inter-satellite free space optical links." In SPIE Security + Defence, edited by Edward M. Carapezza, Panos G. Datskos, and Christos Tsamis. SPIE, 2014. http://dx.doi.org/10.1117/12.2067560.

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Welch, Matthew, James Edmunds, Naresh Thipparapu, Aubin Donnot, and Peter Kean. "Extremely powerful optical sources (EPOS) for Tbit/s satellite links." In Free-Space Laser Communications XXXV, edited by Hamid Hemmati and Bryan S. Robinson. SPIE, 2023. http://dx.doi.org/10.1117/12.2646594.

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Stampoulidis, Leontios, Ahmed Osman, I. Sourikopoulos, Matthew Welch, James Edmunds, Stratos Kehayas, Georg Winzer, et al. "H2020-SPACE-ORIONAS miniaturized optical transceivers and amplifiers for high-speed optical inter-satellite links." In Free-Space Laser Communications XXXIV, edited by Hamid Hemmati and Bryan S. Robinson. SPIE, 2022. http://dx.doi.org/10.1117/12.2609596.

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Awan, M. S., Marzuki, E. Leitgeb, B. Hillbrand, F. Nadeem, and M. S. Khan. "Cloud attenuations for free-space optical links." In 2009 International Workshop on Satellite and Space Communications (IWSSC). IEEE, 2009. http://dx.doi.org/10.1109/iwssc.2009.5286364.

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Betti, Silvello, Valeria Carrozzo, and Elisa Duca. "Use of Optical Amplifiers in GEO-HAP free space links." In 2007 International Workshop on Satellite and Space Communications. IEEE, 2007. http://dx.doi.org/10.1109/iwssc.2007.4409395.

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Weerackody, V., A. R. Hammons, and D. J. Tebben. "Multi-Input Multi-Output Free Space Optical Satellite Communication Links." In 2007 41st Annual Conference on Information Sciences and Systems. IEEE, 2007. http://dx.doi.org/10.1109/ciss.2007.4298392.

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Awan, Muhammad Saleem, Erich Leitgeb, Marzuki, Muhammad Saeed Khan, Farukh Nadeem, and Carlo Capsoni. "Evaluation of fog attenuation results for optical wireless links in free space." In 2008 IEEE International Workshop on Satellite and Space Communications (IWSSC). IEEE, 2008. http://dx.doi.org/10.1109/iwssc.2008.4656761.

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Звіти організацій з теми "Earth-satellite free space optical links"

McHugh, Power, and Randell. L51972 Encroachment Monitoring via Earth Observation Data. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), June 2001. http://dx.doi.org/10.55274/r0011240.

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The objective of the pipeline encroachment monitoring project was to demonstrate the feasibility of using Earth observation (EO) satellites for early detection of third-party encroachment activities. Examples of encroachment activities include road construction, cable laying, farming, and residential or commercial development. Optical and synthetic aperture radar (SAR) images taken from space-borne platforms were evaluated for use in detecting encroachment activities. C-CORE and TransCanada Pipelines Ltd. conducted an encroachment field program near Whitecourt, Alberta. Various encroachment activities, principally involving heavy equipment, were staged and concurrent satellite-based optical (IKONOS) and SAR (RADARSAT) images acquired. These images were then analyzed for signatures of the encroachment events. A total of 22 multispectral and panchromatic IKONOS images and 14 RADARSAT SAR images were acquired. The IKONOS satellite proved to be effective in detecting smaller vehicles (for example, small trucks or Bobcat tractors) in areas that are free from cloud cover. RADARSAT proved effective in the detection of larger vehicles (for example, excavators or dump trucks), linear excavation, deforestation, and the provision of reliable coverage in all weather conditions.

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