|Optical Communications Systems for NASA's Human Space Flight Missions|
Antonios A. Seas, Bryan Robinson, Tina Shih, Farzana Khatri, Mark Brumfield
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 Multi-GNSS Space Service Volume|
Joel J. Parker, Frank H. Bauer, Benjamin W. Ashman, James J. Miller, Werner Enderle, Daniel Blonski
Global Navigation Satellite Systems (GNSS), now routinely used for navigation by spacecraft in low Earth orbit, are being used increasingly by high-altitude users in geostationary orbit and high eccentric orbits as well, near to and above the GNSS constellations themselves.
|Space User Visibility Benefits of the Multi-GNSS Space Service Volume: An Internationally-Coordinated, Global and Mission-Specific Analysis|
Werner Enderle, Francesco Gini, Henno Boomkamp, Joel J. Parker, Benjamin W. Ashman, Bryan W. Welch, Mick V. Koch, Obed S. Sands
The number and scope of Global Navigation Satellite System (GNSS)-based space applications has grown significantly since the first GNSS space receiver was flown in the early 1980's. The vast majority of GNSS space users operate in Low-Earth Orbit (LEO), where the use of GNSS receivers has become routine.
|Space Mobile Network Concepts for Missions Beyond Low Earth Orbit|
David J. Israel, Christopher J. Roberts, Robert M. Morgenstern, Jay L. Gao, Wallace S. Tai
The Space Mobile Network (SMN) is an architectural framework that will allow for quicker, more efficient and more easily available space communications services, providing user spacecraft with an experience similar to that of terrestrial mobile network users.
|Securing and Auto-Synchronizing Communication over Free-Space Optics Using Quantum Key Distribution and Chaotic Systems|
Naveed Mahmud, Esam El-Araby, Harry Shaw, La Vida Cooper
Free-Space Optical (FSO) communication provides very large bandwidth, relatively low cost, low power, low mass of implementation, and improved security when compared to conventional Free-Space Radio-Frequency (FSRF) systems.
|Investigation into New Ground Based Communications Service Offerings in Response to SmallSat Trends|
Scott H. Schaire, Serhat Altunc, Yen Fun Wong, Obadiah O. Kegege, George D. Bussey, Marcus Murbach, Howard Garon, Yudhajeet Dasgupta, Steve Gaines, Edward McCarty
The number of NASA sponsored Small Satellite (SmallSat) missions is expected to continue to grow rapidly in the next decade and beyond. There is a growing trend towards more ambitious SmallSat missions, including formation flying (Constellation, Cluster, Trailing) SmallSats and SmallSats destined for lunar orbit and beyond.
|Automated Spacecraft Communications Service Demonstration Using NASA's SCaN Testbed|
Dale J. Mortensen, Christopher Roberts, Richard C. Reinhart
The traditional paradigm for space mission operations relies on inefficient, highly scripted pre-planned activities between space communications & navigation service providers and user ground mission operations centers.
|NASA's Launch Communications Ground Segment for the 21st Century Florida Spaceport|
Christopher J. Roberts, David R. McCormick, Robert N. Tye, Eric J. Harris, David L. Carter, John J. Hudiburg, Patricia H. Peskett, Peter B. Celeste, Patricia R. Perrotto
The National Aeronautics and Space Administration (NASA) Near Earth Network (NEN) Project is implementing a new launch communications ground segment to provide services for the next generation of human and robotic space exploration systems.
|Commissioning of NASA's 3rd Generation Tracking and Data Relay Satellites (TDRS KLM)|
Jennifer Donaldson, Gregory Heckler, Cheryl Gramling, Benjamin Ashman, Marco Toral, Christopher Carson, Jeremy Lyon
In the summer of 2017, the third and final spacecraft of the 3rd generation of the Tracking and Data Relay Satellites (TDRS) launched aboard an Atlas V rocket from Complex 41 on the Eastern Test Range. Finishing final testing and integration in the first quarter of 2018, the TDRS-M communication and navigation satellite completes a constellation that began service in the early 1980s.
|Space Mobile Network (SMN) User Demonstration Satellite (SUDS) for a Practical On-Orbit Demonstration of User Initiated Services (UIS)|
Harry C. Shaw, David J. Israel, Christopher J. Roberts, Jacob C. Burke, Jin S. Kang, Jeffery T. King
This paper will discuss the various aspects of implementation of the Space Mobile Network (SMN) architecture framework within the context of operations of various nodes equipped with the User Initiated Services (UIS) protocol.