pdf document 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.
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pdf document GPS Operations in High Earth Orbit: Recent Experiences and Future Opportunities

Benjamin W. Ashman, Frank H. Bauer, Joel J.K. Parker, Jennifer E. Donaldson

Over the past two decades, spacecraft in Low Earth Orbit (LEO) have significantly benefited from real-time reception of navigation and timing signals from the Global Positioning System (GPS).
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pdf document Update on NASA's Laser Communications Relay Demonstration Project

Bernard L. Edwards, David J. Israel

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).
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pdf document Education and Outreach at NASA's Goddard Space Flight Center

Harry C. Shaw, Sandra Vilevac, Seema Vithlani

NASA's Space Communications and Navigation (SCaN) Program Office maintains a year-round educational program for undergraduate and graduate students.
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pdf document 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.
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pdf document 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.
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pdf document Text Size Grow Text Size Shrink Text Size Record 7 of 162 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.
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pdf document 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.
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Next-Generation NASA Earth-Orbiting Relay Satellites: Fusing Optical and Microwave Communications Next-Generation NASA Earth-Orbiting Relay Satellites: Fusing Optical and Microwave Communications

David J. Israel, Harry Shaw

NASA is currently considering architectures and concepts for the generation of relay satellites that will replace the Tracking and Data Relay Satellite (TDRS) constellation, which has been flying since 1983. TDRS-M, the last of the second TDRS generation, launched in August 2017, extending the life of the TDRS constellation beyond 2030.
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Sextant X-Ray Pulsar Navigation Demonstration: Initial On-Orbit Results Sextant X-Ray Pulsar Navigation Demonstration: Initial On-Orbit Results

Jason W. Mitchell, Luke B. Winternitz, Munther A. Hassouneh, Samuel R. Price, Sean R. Semper, Wayne H. Yu, Paul S. Ray, Michael T. Wolf, Matthew Kerr, Kent S. Wood

Millisecond pulsars (MSPs) are rapidly rotating neutron stars that appear to pulsate across the electromagnetic spectrum. Some MSPs have long-term timing stability that rivals that of atomic clocks. Pulse arrival phase can be predicted with great accuracy at any reference point in the Solar System through use of a pulsar timing model on a spacecraft.
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