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BIOGRAPHICAL
SKETCH
Michael
Hadjitheodosiou was born and grew up in Nicosia,
Cyprus. He
graduated
from Peterhouse, University
of Cambridge, U.K., with an M.A. in Electrical
& Information Sciences. He has an M.S. in Electrical & Computer
Engineering
from the University of California,
Irvine and
the Ph.D. in
Engineering (specializing in
satellite communications) from the Centre
for Satellite Engineering Research (CSER) at the University
of Surrey, U.K. He has worked as a Research Fellow in the
Communication
Systems group(CSSR) at
Surrey and has spent a year as a visiting
fellow at the Canadian Government
Communications Research Center
(CRC). Since then he has been a member of the faculty of the Center
for Satellite & Hybrid Communication Networks (CSHCN) at the Institute for Systems Research,
University of Maryland, College
Park.
Among his awards are: a full scholarship for studies at the University of Cambridge from the Cambridge Commonwealth Trust , a Fulbright Scholarship for post-graduate work in the United States (CASP Program), a Research Fellowship from the U.K. Engineering and Physical Sciences Research Council (EPSRC) and the Canadian National Science and Engineering Research Council (NSERC) post-doctoral fellowship award.
Dr. Hadjitheodosiou is an expert on space communications, satellite networks and multi-satellite constellations. He has worked for several years in networking issues for VSAT networks, developed performance evaluation methods for satellite constellations, multiple access schemes for satellite networks and designs for satellite gateways. He is currently working on modeling and design of new satellite systems, utilization of commercial satellite constellations for space mission support, and extending Internet services to NASA missions. His research interests include multimedia traffic modeling, service integration for wireless and hybrid networks, end-to-end performance optimization of satellite and mobile networks, protocol support over satellite channels, and design optimization of next generation broadband satellite systems. He has published on these topics in a variety of books, journals and conference proceedings [List of Publications]. He is a member of the IEEE and of AIAA and the secretary of the IEEE Satellite and Space Communications Technical Committee. He is listed in International WhoÕs Who of Information Technology, WhoÕs Who in Electrical Engineering and WhoÕs Who in the World.
He is also the principal in Celestial Experts, a Telecommunications and Aerospace consulting practice.
Among his awards are: a full scholarship for studies at the University of Cambridge from the Cambridge Commonwealth Trust , a Fulbright Scholarship for post-graduate work in the United States (CASP Program), a Research Fellowship from the U.K. Engineering and Physical Sciences Research Council (EPSRC) and the Canadian National Science and Engineering Research Council (NSERC) post-doctoral fellowship award.
Dr. Hadjitheodosiou is an expert on space communications, satellite networks and multi-satellite constellations. He has worked for several years in networking issues for VSAT networks, developed performance evaluation methods for satellite constellations, multiple access schemes for satellite networks and designs for satellite gateways. He is currently working on modeling and design of new satellite systems, utilization of commercial satellite constellations for space mission support, and extending Internet services to NASA missions. His research interests include multimedia traffic modeling, service integration for wireless and hybrid networks, end-to-end performance optimization of satellite and mobile networks, protocol support over satellite channels, and design optimization of next generation broadband satellite systems. He has published on these topics in a variety of books, journals and conference proceedings [List of Publications]. He is a member of the IEEE and of AIAA and the secretary of the IEEE Satellite and Space Communications Technical Committee. He is listed in International WhoÕs Who of Information Technology, WhoÕs Who in Electrical Engineering and WhoÕs Who in the World.
| LIST OF
PUBLICATIONS |
RESEARCH
BRIEF |
CITATION
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BROADBAND SATELLITE RESEARCH LINKS |
CURRENT RESEARCH PROJECTS
| Flexible
and Secure Access to Space Michael Hadjtheodosiou is the Principal Investigator for a NASA Space Communications Project in Computing Information and Communication Technologies award. The project "Flexible and Secure Access for High Data Rate Space Communicatins" evaluated alternatives for more efficient and dynamic ways to communicate with NASA missions. The objective is to enable scientists to access data "anytime, anywhere" through the Internet. It focuses on issues such as dynamic multiple access techniques for an "on-demand" operational scenario and required modifications of the Ground Network that will enable more efficient access. It also looks at security, traffic analysis and QoS support issues for this architecture. |
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| Communication
requirements for constellation space missions and Planetary Sensor Nets This project addressess the communication requirements for constellation space missions and planetray senson networks. We develop the framework for studying the operational communication trade-offs for typical constellation missions. We developed a simple prototype dynamic routing algorithm for this type of mission. As an example, we studied Magnetospheric Multiscale Mission (MMS) in detail, developed fairly detailed simulation models for this mission and performed simulation and obtained some preliminary simulation results. Sensor networks employed in NASA exploration missions have to pay particular attention to energy, as energy depletion will render them useless. The harsh space environment and the large distances make the problem of designing energy efficiency in all aspects of the network a very challenging problem. We investigate energy efficiency issues in sensor networks at all levels, from hardware to application level. We will investigate energy efficient algorithms for maximizing throughput as well as optimizing other metrics such as mission lifetime. |
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| Communications
for the International Space Station (ISS) As an interim solution to providing high-speed communication services from the ISS to the ground via commercial assets, NASA is considering, in the short term, the option to transmit commercial data from the ISS directly to existing commercial Ka-terminals on the ground While utilizing these existing terminals could save costs, their properties may not be optimum, such as location, terrestrial link to Internet backbone, and available terminal time. Hence, NASA could consider building new terminals that would allow for optimum placement of the terminals and ensure priority service. This project investigated the feasibility of using existing commercial fixed ground Ka-band terminals for ISS communications in the near future, and perform a trade-off analysis between this option versus building new ground terminals at optimally placed locations. |
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| Broadband
Support for a Satellite-based Aeronautical Communication Network The US airspace is reaching its capacity with the current Air Traffic Control System. The FAA has undertaken several initiatives to modernize the National Airspace System (NAS) to ensure the safety of the increasing number of flights. Next generation satellite systems offering global coverage and high capacity can be an alternative to the terrestrial communication systems and the challenges that need to be addressed in doing that will be the focus of this study. We are in the process of studing the current NAS communication system and FAA modernization program, defining the communication requirements for a satellite-based solution to broadband aeronautical communications and designing an efficient and reliable transport layer protocol for aeronautical satellite networks that maintains high utilization of the satellite link and improve fairness among competing TCP connections. |
OTHER ACTIVITIES
Dr. Hadjitheodosiou is on the Board of Directors of the Cyllenius Foundation a 501(c)3 non-profit educational research foundation, drawing upon 12+ years of niche activity in educational technologies, pulling together collaborators in the USA, Australia, Far East and Europe. The Group specializes in data-driven research on teaching (and learning) tools (and media).
He is also the principal in Celestial Experts, a Telecommunications and Aerospace consulting practice.