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NASA's mobile satellite communications program; ground and space segment technologiesThis paper describes the Mobile Satellite Communications Program of the United States National Aeronautics and Space Administration (NASA). The program's objectives are to facilitate the deployment of the first generation commercial mobile satellite by the private sector, and to technologically enable future generations by developing advanced and high risk ground and space segment technologies. These technologies are aimed at mitigating severe shortages of spectrum, orbital slot, and spacecraft EIRP which are expected to plague the high capacity mobile satellite systems of the future. After a brief introduction of the concept of mobile satellite systems and their expected evolution, this paper outlines the critical ground and space segment technologies. Next, the Mobile Satellite Experiment (MSAT-X) is described. MSAT-X is the framework through which NASA will develop advanced ground segment technologies. An approach is outlined for the development of conformal vehicle antennas, spectrum and power-efficient speech codecs, and modulation techniques for use in the non-linear faded channels and efficient multiple access schemes. Finally, the paper concludes with a description of the current and planned NASA activities aimed at developing complex large multibeam spacecraft antennas needed for future generation mobile satellite systems.
Document ID
19850030889
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Naderi, F.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Weber, W. J.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Knouse, G. H.
(NASA Headquarters Washington, DC United States)
Date Acquired
August 12, 2013
Publication Date
October 1, 1984
Subject Category
Communications And Radar
Report/Patent Number
IAF PAPER 84-84
Accession Number
85A13040
Distribution Limits
Public
Copyright
Other

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