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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 91 records · Page 5
All sourcesNASA NTRSDOE OSTI
NASA NTRS2012

Development of the Optical Communications Telescope Laboratory: A Laser Communications Relay Demonstration Ground Station

The Laser Communications Relay Demonstration (LCRD) project will demonstrate high bandwidth space to ground bi-directional optical communications links between a geosynchronous satellite and two LCRD optical ground stations located in the southwestern United States. The project plans to operate for two years with a possible extension to five. Objectives of the demonstration include the development of operational strategies to prototype optical link and relay services for the next generation tracking and data relay satellites. Key technologies to be demonstrated include adaptive optics to correct for clear air turbulence-induced wave front aberrations on the downlink, and advanced networking concepts for assured and automated data delivery. Expanded link availability will be demonstrated by supporting operations at small sun-Earth-probe angles. Planned optical modulation formats support future concepts of near-Earth satellite user services to a maximum of 1.244 Gb/s differential phase shift keying modulation and pulse position modulations formats for deep space links at data rates up to 311 Mb/s. Atmospheric monitoring instruments that will characterize the optical channel during the link include a sun photometer to measure atmospheric transmittance, a solar scintillometer, and a cloud camera to measure the line of sight cloud cover. This paper describes the planned development of the JPL optical ground station.

optical commuication↗
NASA NTRS2010

Preliminary Results of the OCTL to OICETS Optical Link Experiment (OTOOLE)

JPL in collaboration with JAXA and NICT demonstrated a 50Mb/s downlink and 2Mb/s uplink bi-directional link with the LEO OICETS satellite. The experiments were conducted in May and June over a variety of atmospheric conditions. Bit error rates of 10-(sup 1) to less than 10-? were measured on the downlink. This paper describes the preparations, precursor experiments, and operations for the link. It also presents the analyzed downlink data results.

Table Mountain↗
NASA NTRS2018

Optical Communications Systems for NASA's Human Space Flight Missions

The Laser-Enhanced Mission Communications Navigation and Operational Services (LEMNOS) office at Goddard Space Flight Center (GSFC) manages two NASA optical communication related projects, the Orion EM-2 Optical Communications Terminal (O2O) and the Integrated Laser Communications Relay Demonstration (LCRD) Low-Earth Orbit (LEO) User Modem and Amplifier Terminal (ILLUMA-T) projects. The main goal of LEMNOS is the advancement and implementation of optical communications systems and technologies for NASA missions. The O2O mission is sponsored by NASA's Human Exploration and Operations (HEO) Mission Directorate. The O2O project will provide optical communications capability to the Orion series of spacecraft, starting with the demonstration of operational utility on EM-2. It will be the first time a human exploration mission will rely on optical communications for its high-bandwidth link. ILLUMA-T is sponsored by the Space Communications and Navigation (SCaN) Program Office. It is destined for the International Space Station (ISS) as an external payload attached to the Japanese Experiment Module - Exposed Facility (JEM-EF). The ILLUMA-T project is developing an optical communications user terminal to demonstrate high bandwidth data transfer between LEO and the ground through the geosynchronous LCRD relay. ILLUMA-T will be the first demonstration of a LEO user of the LCRD system, pointing and tracking from a moving spacecraft at LEO to GEO satellite and vice versa, end-to-end operational utility of optical communications, and 51 Mbps forward link to ISS from ground. Both projects are collaborations between GSFC, Massachusetts Institute of Technology â€" Lincoln Laboratory (MIT-LL), and a number of contractors.

Lasercom↗
NASA NTRSDate not supplied

Optical Communications Operations Concept for the Artemis II Crewed Mission to the Moon

NASA’s Artemis II mission will fly a human crew of 4 to the Moon aboard the Orion spacecraft for the first time since the Apollo missions. The Orion spacecraft includes an optical communication payload, known on board as “OpCom,” which is part of NASA’s Orion Artemis II Optical Communications (O2O) demonstration. OpCom will be controlled directly from the Mission Control System (MCC) in Houston and will support forward links up to 20 Mbps and return links up to 250 Mbps for at least 1 hour per mission day. It will be used to transfer files and provide real-time video SD and HD video to/from MCC. We describe the OpCom system architecture and operations concept.

optical communications↗
NASA NTRSDate not supplied

System Level TVAC Functional Testing for the Integrated LCRD Low-Earth Orbit User Modem and Amplifier Terminal (ILLUMA-T) Payload Destined for the International Space Station

The Integrated LCRD Low-Earth Orbit User Modem and Amplifier Terminal (ILLUMA-T) Payload will be launched to the International Space Station (ISS) in 2023. ILLUMA-T is an optical communications payload that will make the ISS the first space-based user to communicate with NASA’s Laser Communications Relay Demonstration (LCRD). The system will support all-optical forward links up to 150 Mbps and return links up to 1 Gbps. The payload recently underwent system level Thermal VACuum (TVAC) functional testing at MIT Lincoln Laboratory. We present an overview of the payload’s TVAC functional tests and results.

lasercom↗
NASA NTRSDate not supplied

On-Orbit Demonstration of 100 Gbps Optical Downlinks from the TBIRD Cubesat

In June 2022, NASA’s TeraByte Infrared Delivery (TBIRD) program successfully demonstrated 100 Gbps laser communications from low-Earth orbit to a ground. The 3U communication terminal (hosted on a 6U nanosatellite) established downlinks during 5-minute passes over the ground station that resulted in the transfer of Terabyte-class data volumes. This paper provides an overview of the system architecture, operations, and link performance results.

ISS↗
NASA NTRSDate not supplied

On-Orbit Results of Pointing, Acquisition, and Tracking for the TBIRD CubeSat Mission

NASA’s TeraByte Infrared Delivery (TBIRD) program launched in May 2022 and successfully demonstrated high-rate laser communications from low-Earth orbit to ground. The laser communications payload provides pointing feedback to the host spacecraft to precisely track the ground station through the 5-minute pass. This paper presents the on-orbit results of the pointing system for TBIRD, including initial acquisition and closed-loop performance within about 30 urad RMS per axis.

Lasercom↗