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  • 1
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    ACTS on-orbit multibeam antenna pattern measurements (1995)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Advanced Communication Technology (ACTS) is a key to NASA's goal of developing high-risk, advanced communications technology using multiple frequency bands to support the nation's future communication needs. Using the multiple, dynamic hopping spot beams and advanced on board switching and processing systems, ACTS will open a new era in communications satellite technology. One of the key technologies to be validated as part of the ACTS program is the multibeam antenna (MBA) with rapidly reconfigurable hopping and fixed spot beams to serve users equipped with small-aperture terminals within the coverage areas. The MBA test program is designed to evaluate the on-orbit ACTS antenna performance. The main parameters measured are beam shape, beam center location and gain.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-107044 , E-9879 , NAS 1.15:107044
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    30/20 GHz wideband technology verification program (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper discusses various aspects of the 30/20 GHz wideband technology verification activities of NASA. The discussion considers the objectives, approach, system requirements, possible experiment configuration and payload, and the supporting research and technology elements.
    Keywords: COMMUNICATIONS AND RADAR
    Type: In: ICC ''79; International Conference on Communications; Jun 10, 1979 - Jun 14, 1979; Boston, MA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Communication satellite services for special purpose users (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present study identifies potential satellite services, examines the technology necessary for efficient implementation of these services, and determines minimum service cost versus user network size. The generic satellite services evaluated comprise TV and radio distribution (for retransmission), video teleconferencing (interactive), audio/facsimile teleconferencing (interactive), multiplexed data/voice (point-to-point), and satellite-supported land mobile. Satellite costs are based on extrapolations from ongoing commercial satellite programs. Production methods, new technology, and effect of production quantities on present and future production costs are examined to provide information on earth station equipment cost versus the variable 'buy'. Six different launch vehicles from a Delta 2914 to a dedicated Shuttle and three frequency bands and both broadcast (no eclipse capability) and fixed service satellites are considered to assess the effect of satellite size on cost and performance. It is assumed that the user pays only for his prorata share of the space segment costs.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Intelcom ''77 Symposium; Oct 09, 1977 - Oct 15, 1977; Atlanta, GA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    20/30 GHz satellite systems technology needs assessment (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper surveys the system and market work done at NASA-Lewis with regard to exploring the potential of the 20/30 GHz bands for domestic satellite communications. The 20/30 GHz bands appear attractive economically and, with certain technology advances, appear to offer a virtually unlimited spectrum resource. This attractiveness is especially relevant to high density trunking where there is sufficient traffic to justify dual-station site diversity. Ongoing system and market studies actively involve satellite system suppliers and carriers as well as the government in a cooperative, mutually beneficial effort. It is considered that this is the approach most likely to result in a spectrum-efficient acceptable-risk high-capacity 30/30 GHz satellite system which is relevant to anticipated markets.
    Keywords: COMMUNICATIONS AND RADAR
    Type: Instrument Society of America, International Telemetering Conference; Nov 14, 1978 - Nov 16, 1978; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Results of thin-route satellite communication system analyses including estimated service costs (1979)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A variety of cost and performance tradeoffs are addressed and the preliminary design of a communications satellite system capable of meeting isolated rural users' needs is presented. Small inexpensive rural earth stations are linked via the satellite to a nation wide network of large earth stations which are, in turn, interconnected to the switching exchanges of the conventional telephone network. Optimum earth station EIRP and G/T and satellite transponder power are defined as a function of a wide variety of system options.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-79098 , E-9922 , Intern. Telecommun. Exposition; Feb 26, 1979 - Mar 02, 1979; Dallas, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Results of thin-route satellite communication system analyses including estimated service costs (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Ways for determining optimum satellite and terrestrial system architectures and parameters for providing the most economical telephone service to remote areas of the U.S. are explored. Several configurations for an isolated rural telephone system, covering all the states plus Alaska, employing satellites is considered. Both direct-to-the-user and community-type of systems are evaluated using UHF and Ku-band RF equipment for the rural/satellite links. The effect of multiple spot beams, outage, signal quality, modulation method, satellite accessing, forward error correction, and the number of users are also evaluated. The total cost for a 5-minute call from an isolated rural user to a TELCO user was shown to be as low as $1.30 for a system with 1.8 X 10 to the sixth rural users.
    Keywords: COMMUNICATIONS AND RADAR
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    The 20/30 GHz satellite systems technology needs assessment (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Rain attenuation in the 20/30 GHz bands, and the resultant impact on system user costs were estimated for a variety of satellite communication system concepts. Results of previous and current NASA Lewis contractual and in-house studies on system design are reported as well as market studies conducted to evaluate the concepts and test their relevancy against forecasted market needs. The 20/30 GHz bands appear attractive economically and, with certain technology, appear to offer a virtually unlimited spectrum resource. This attractiveness is especially relevant to high density trunking where there is sufficient traffic to justify dual-station site diversity.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-78975 , E-9750 , Intern. Telemetry Conf.; Nov 14, 1978 - Nov 16, 1978; Los Angeles
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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