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  • 1
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    Optical Communications Telescope Laboratory (OCTL) Support of Space to Ground Link Demonstrations (2014)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The NASA/JPL Optical Communication Telescope Laboratory (OCTL) was built for dedicated research and development toward supporting free-space laser communications from space. Recently, the OCTL telescope was used to support the Lunar Laser Communication Demonstration (LLCD) from the Lunar Atmospheric Dust Environment Explorer (LADEE) spacecraft and is planned for use with the upcoming Optical Payload for Lasercomm Science (OPALS) demonstration from the International Space Station (ISS). The use of OCTL to support these demonstrations is discussed in this report. The discussion will feed forward to ongoing and future space-to-ground laser communications as it advances toward becoming an operational capability.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: SpaceOps 2014; May 05, 2014 - May 09, 2014; Pasadena, CA; United States
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    NASA TECHNICAL REPORTS
  • 2
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    Mars Mission Scenario: Data Volume and PDT Notes (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Objectives of this work are: (1) Investigate methods for quantifying the value of interoperability for deep space missions: A network of optical receive stations Each one potentially owned by a different space agency. Reduces overall cost to any individual agency Provides geographically diverse locations to mitigate weather problems (clouds, wind, rain, dust, etc.) (2) Metrics: a. Total data volume returned over mission duration b. Percent data transferred (PDT) or something similar.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: European Space Agency Optical Link Study Group; Apr 01, 2012; Darmstadt; Germany
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    NASA TECHNICAL REPORTS
  • 3
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    Evaluation of Deep-Space Laser Communication under Different Mission Scenarios (2012)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A number of space agencies, including NASA, are considering free-space laser communications as a means for returning higher data-rates from future space missions. In this paper, potential deep-space missions are evaluated to show that with optical communication a 10x increase relative to state-of-the art telecommunication systems could be achieved. The maximum deep-space distance where ground transmitted laser beacons could assist acquisition and tracking; and operating points where optical communication performance degrades faster than the inverse square distance are also discussed.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: SPIE Photonics West; Jan 21, 2012 - Jan 26, 2012; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
  • 4
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    Deep-Space Optical Terminals (DOT) (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A conceptual design study titled Deep-Space Optical Terminals was recently completed for an optical communication technology demonstration from Mars in the 2018 time frame. We report on engineering trades for the entire system, and for individual subsystems including the flight terminal, the ground receiver and the ground transmitter. A point design is described to meet the requirement for greater than 0.25 Gb/s downlink from the nearest distance to Mars of 0.42 AU with a maximum mass and power allocation of 40 kg and 110 W. Furthermore, the concept design addresses link closure at the farthest Mars range of 2.7 AU. Maximum uplink data-rate of 0.3 Mb/s and ranging with 30 cm precision are also addressed.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: Photonics West - Free Space Optical Communications; Jan 22, 2011 - Jan 27, 2011; San Francisco, CA; United States
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    NASA TECHNICAL REPORTS
  • 5
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    A Study of an Optical Lunar Surface Communications Network with High Bandwidth Direct to Earth Link (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A lunar surface systems study explores the application of optical communications to support a high bandwidth data link from a lunar relay satellite and from fixed lunar assets. The results show that existing 1-m ground stations could provide more than 99% coverage of the lunar terminal at 100Mb/s data rates from a lunar relay satellite and in excess of 200Mb/s from a fixed terminal on the lunar surface. We have looked at the effects of the lunar regolith and its removal on optical samples. Our results indicate that under repeated dust removal episodes sapphire rather than fused silica would be a more durable material for optical surfaces. Disruption tolerant network protocols can minimize the data loss due to link dropouts. We report on the preliminary results of the DTN protocol implemented over the optical carrier.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: 2011 IEEE International Conference on Space Optical Systems and Applications (ICSOS); May 11, 2011 - May 13, 2011; Santa Monica, CA; United States
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    NASA TECHNICAL REPORTS
  • 6
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    Optical PAyload for Lasercom Science: OPALS (2013)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: No abstract available
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: Joint CSA/ESA/JAXA/NASA Increment 37 and 38 Science Symposium; May 28, 2013 - May 29, 2013; Webinar; United States
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    NASA TECHNICAL REPORTS
  • 7
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    A Study of an Optical Lunar Surface Communications Network with High Bandwidth Direct to Earth Link (2011)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Analyzed optical DTE (direct to earth) and lunar relay satellite link analyses, greater than 200 Mbps downlink to 1m Earth receiver and greater than 1 Mbps uplink achieved with mobile 5cm lunar transceiver, greater than 1Gbps downlink and greater than 10 Mpbs uplink achieved with 10cm stationary lunar transceiver, MITLL (MIT Lincoln Laboratory) 2013 LLCD (Lunar Laser Communications Demonstration) plans to demonstrate 622 Mbps downlink with 20 Mbps uplink between lunar orbiter and ground station; Identified top five technology challenges to deploying lunar optical network, Performed preliminary experiments on two of challenges: (i) lunar dust removal and (ii)DTN over optical carrier, Exploring opportunities to evaluate DTN (delay-tolerant networking) over optical link in a multinode network e.g. Desert RATS.
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: 2011 IEEE International Conference on Space Optical Systems and Applications (ICSOS); May 11, 2011 - May 13, 2011; Santa Monica, CA; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Advanced Communications, Navigation and Technology Concepts for a Mars 2018 Orbiter (2013)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Space Communications, Spacecraft Communications, Command and Tracking
    Type: IEEE Aerospace Conference; Mar 02, 2013 - Mar 09, 2013; Big Sky, MT; United States
    Format: text
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    NASA TECHNICAL REPORTS
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