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  • Communications and Radar  (7)
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  • 1
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    Latest Changes to NASA's Laser Communication Relay Demonstration Project (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Over the last couple of years, NASA has been making changes to the Laser Communications Relay Demonstration Project (LCRD), a joint project between NASA's Goddard Space Flight Center (GSFC), the Jet Propulsion Laboratory, California Institute of Technology (JPL), and the Massachusetts Institute of Technology Lincoln Laboratory (MIT/LL). The changes made makes LCRD more like a future Earth relay system that has both high speed optical and radio frequency links. This will allow LCRD to demonstrate a more detailed concept of operations for a future operational mission critical Earth relay. LCRD is expected to launch in June 2019 and is expected to be followed a couple of years later with a prototype user terminal on the International Space Station. LCRD's architecture will allow it to serve as a testbed in space and this paper will provide an update of its planned capabilities and experiments.
    Keywords: Communications and Radar
    Type: GSFC-E-DAA-TN50575 , SPIE Photonics West 2018 Conference; Jan 27, 2018 - Feb 01, 2018; San Francisco, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The Laser Communications Relay Demonstration Experiment Program (2017)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: This paper elaborates on the Laser Communications Relay Demonstration (LCRD) Experiment Program, which will engage in a number of pre-determined experiments and also call upon a wide variety of experimenters to test new laser communications technology and techniques, and to gather valuable data. LCRD is a joint project between NASA's Goddard Space Flight Center (GSFC), the Jet Propulsion Laboratory (JPL), and the Massachusetts Institute of Technology Lincoln Laboratory (MIT LL). LCRD will test the functionality in various settings and scenarios of optical communications links from a GEO (Geosynchronous Earth Orbit) payload to ground stations in Southern California and Hawaii over a two-year period following launch in 2019. The LCRD investigator team will execute numerous experiments to test critical aspects of laser communications activities over real links and systems, collecting data on the effects of atmospheric turbulence and weather on performance and communications availability. LCRD will also incorporate emulations of target scenarios, including direct-to-Earth (DTE) links from user spacecraft and optical relay providers supporting user spacecraft. To supplement and expand upon the results of these experiments, the project also includes a Guest Experimenters Program, which encourages individuals and groups from government agencies, academia and industry to propose diverse experiment ideas.
    Keywords: Communications and Radar
    Type: GSFC-E-DAA-TN46359 , Ka and Broadband Communications Conference; Oct 16, 2017 - Oct 19, 2017; Trieste; Italy|AIAA International Communications Satellite Systems Conf. (ICSSC); Oct 16, 2017; Trieste; Italy
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    An Update on the CCSDS Optical Communications Working Group Interoperability Standards (2019)
    In:  CASI
    Details
    Publication Date: 2019-11-14
    Description: International space agencies around the world are working together in the Interagency Operation Advisory Group (IOAG) and the Consultative Committee for Space Data Systems (CCSDS) to develop interoperability standards for optical communications. The standards support optical communication systems for both Near Earth and Deep Space robotic and human-rated spacecraft. The standards generally address both free space links between spacecraft and free space links between spacecraft and ground. This paper will overview the history and structure of the CCSDS Optical Communications Working Group and provide an update on the set of optical communications standards being developed. The paper will address the ongoing work on High Photon Efficiency communications, High Data Rate communications, and Optical On/Off Keying communications. It will also cover the working being done within CCSDS on documenting atmospheric measurement techniques and link operations concepts.
    Keywords: Communications and Radar
    Type: GSFC-E-DAA-TN73523 , IEEE International Conference on Space Optical Systems and Applications; Oct 14, 2019 - Oct 16, 2019; Portland, OR; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Commercialization and Standardization Progress Towards an Optical Communications Earth Relay (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA is planning to launch the next generation of a space based Earth relay in 2025 to join the current Space Network, consisting of Tracking and Data Relay Satellites in space and the corresponding infrastructure on Earth. While the requirements and architecture for that relay satellite are unknown at this time, NASA is investing in communications technologies that could be deployed to provide new communications services. One of those new technologies is optical communications. The Laser Communications Relay Demonstration (LCRD) project, scheduled for launch in 2018 as a hosted payload on a commercial communications satellite, is a critical pathfinder towards NASA providing optical communications services on the next generation space based relay. This paper will describe NASA efforts in the on-going commercialization of optical communications and the development of inter-operability standards. Both are seen as critical to making optical communications a reality on future NASA science and exploration missions. Commercialization is important because NASA would like to eventually be able to simply purchase an entire optical communications terminal from a commercial provider. Inter-operability standards are needed to ensure that optical communications terminals developed by one vendor are compatible with the terminals of another. International standards in optical communications would also allow the space missions of one nation to use the infrastructure of another.
    Keywords: Communications and Radar
    Type: GSFC-E-DAA-TN32963 , 2015 IEEE Aerospace Conference; Mar 07, 2015 - Mar 14, 2015; Big Sky, MT; United States|Proceedings of 2015 IEEE Aerospace Conference
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A Geosynchronous Orbit Optical Communications Relay Architecture (2014)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA is planning to fly a Next Generation Tracking and Data Relay Satellite (TDRS) next decade. While the requirements and architecture for that satellite are unknown at this time, NASA is investing in communications technologies that could be deployed on the satellite to provide new communications services. One of those new technologies is optical communications. The Laser Communications Relay Demonstration (LCRD) project, scheduled for launch in December 2017 as a hosted payload on a commercial communications satellite, is a critical pathfinder towards NASA providing optical communications services on the Next Generation TDRS. While it is obvious that a small to medium sized optical communications terminal could be flown on a GEO satellite to provide support to Near Earth missions, it is also possible to deploy a large terminal on the satellite to support Deep Space missions. Onboard data processing and Delay Tolerant Networking (DTN) are two additional technologies that could be used to optimize optical communications link services and enable additional mission and network operations. This paper provides a possible architecture for the optical communications augmentation of a Next Generation TDRS and touches on the critical technology work currently being done at NASA. It will also describe the impact of clouds on such an architecture and possible mitigation techniques.
    Keywords: Communications and Radar
    Type: GSFC-E-DAA-TN32961 , 2014 IEEE Aerospace Conference; Mar 01, 2014 - Mar 08, 2014; Big Sky, MT; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Update on NASA's Laser Communications Relay Demonstration Project (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper provides an update on NASA's Laser Communications Relay Demonstration Project (LCRD), a joint project between NASA's Goddard Space Flight Center (GSFC), the Jet Propulsion Laboratory, California Institute of Technology (JPL), and the Massachusetts Institute of Technology Lincoln Laboratory (MIT/LL). LCRD will provide a minimum of two years of high data rate optical communications services to demonstrate a concept of operations for future mission critical Earth relay satellites. LCRD is expected to launch in June 2019 and demonstrate how optical communications can meet NASA's growing need for higher data rates, or for the same data rate provided by a comparable RF system, how it enables lower power, lower mass communications systems on user spacecraft. In addition, LCRD's architecture will allow it to serve as a testbed in space for the development of additional symbol coding, link and network layer protocols, etc. LCRD's mission and architecture has slowly evolved since the project first started and this paper will provide an update of LCRD and planned capabilities and experiments.
    Keywords: Communications and Radar
    Type: GSFC-E-DAA-TN53991 , International Conference on Space Operations (SpaceOps 2018); May 28, 2018 - Jun 01, 2018; Marseille; France
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    An Update on the CCSDS Optical Communications Working Group (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: International space agencies around the world are currently developing optical communication systems for Near Earth and Deep Space applications for both robotic and human rated spacecraft. These applications include both links between spacecraft and links between spacecraft and ground. The Interagency Operation Advisory Group (IOAG) has stated that there is a strong business case for international cross support of spacecraft optical links. It further concluded that in order to enable cross support the links must be standardized. This paper will overview the history and structure of the space communications international standards body, the Consultative Committee for Space Data Systems (CCSDS), that will develop the standards and provide an update on the proceedings of the Optical Communications Working Group within CCSDS. This paper will also describe the set of optical communications standards being developed and outline some of the issues that must be addressed in the next few years. The paper will address in particular the ongoing work on application scenarios for deep space to ground called High Photon Efficiency, for LEO to ground called Low Complexity, for inter-satellite and near Earth to ground called High Data Rate, as well as associated atmospheric measurement techniques and link operations concepts.
    Keywords: Communications and Radar
    Type: GSFC-E-DAA-TN46232 , IEEE International Conference on Space Optical Systems and Applications (ICSOS) 2017; Nov 14, 2017 - Nov 16, 2017; Okinawa; Japan
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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