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  • 1
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    Station Data Acquisition and Control System. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Station Data Acquisition and Control System (STADAC), a multicomputer data handling and control system, is expected to be installed in six network stations, the first station to be established at Goddard Space Flight Center. Network control data, in the form of schedules and acquisition pointing data, flow from the Network Control Center to the stations, while station status data flow in the other direction. The system will format spacecraft telemetry data for real-time transmission of control and status data to the project operations control centers and for transmission of experiment data to the data processing facilities. The system will also schedule station equipment resources, perform prepass tests to assure data quality, and automatically set up selected station equipment.
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: International Convention and Exposition; Mar 26, 1973 - Mar 30, 1973; New York, NY
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The design and planning of feeder links to broadcasting satellites (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Design and planning guidelines being followed to define feeder link parameters for the U.S. ITU Region 2 DBS system are outlined. The carrier/noise (C/N) ratio determines the signal quality acceptable to the consumer and sets the standards which the link must meet. A 10 dB margin is required to meet a 99 percent availability criterion for the times of heaviest rainfall attenuation. The receiver gain is limited by the bandwidth, system noise temperature, and the antenna size. Three mechanisms have been identified for ensuring receiver discrimination between desired and interfering signals. Test points must be selected to examine the effectiveness of the chosen feeder link configuration in maintaining signal reception and channel separation, of the antennas installed, and of the orbital positions of the satellites.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Journal on Selected Areas in Communications (ISSN 0733-8716); SAC-3; 181-185
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Broadcasting satellite feeder links - Characteristics and planning (1982)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The paper presents the results of recent studies by the Feeder Link Sub-Working Group of the FCC Advisory Committee for the 1983 Regional Administrative Radio Conference (RARC). These studies conclude that specification of a few key parameters will make feeder link planning relatively straightforward. Feeder links can be located anywhere within a country if satellite orbit locations are separated by 10 deg for adjacent service areas and key parameter values presented in the paper are adopted. Colocated satellites serving a common service area need special attention to attain sufficient isolation between a desired channel and its adjacent cross-polarized channels and alternate co-polarized channels. In addition to presenting planning conclusions by the Advisory Committee, the paper presents and analyzes actions of the International Radio Consultative Committee's Conference Planning Meeting (CPM) concerning feeder links. The CPM reached conclusions similar to, and compatible with, those of the Advisory Committee.
    Keywords: COMMUNICATIONS AND RADAR
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The impact of WARC '79 on space applications and research (1980)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: Prior to the 1979 World Administrative Radio Conference (WARC), no frequency bands were allocated for remote sensing measurements. Actions taken by the WARC insure that frequencies will be available for such use, and that operations can be conducted without harmful interference on a worldwide basis for the benefit of all nations. New global allocations for Space Research will permit worldwide acquisition of research data via relay satellites. Wideband allocations for deep-space research will allow more accurate position determination of deep-space probes and transmission of higher resolution data. The WARC had an impact on a number of other applications and research areas such as: meteorological satellites, land-mobile satellites, search and rescue systems, solar power satellites, standard-frequency satellites, radio astronomy and the search for extraterrestrial intelligence. The actions taken at the WARC affecting these services and applications will be described in the paper.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: ICC ''80; International Conference on Communications; Jun 08, 1980 - Jun 12, 1980; Seattle, WA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The impact of WARC-79 on space applications (1981)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: It is pointed out that the decisions of WARC-79 are crucial to the future utility of applications evolving from research and development of space techniques. WARC-79 provided the spectrum allocations and protection which will permit continued development of a broad range of space applications. Space research and earth-exploration satellite services are discussed, taking into account remote sensing, spectrum requirements, implications for designers and regulators, and space research and earth exploration satellite services. Meteorological satellites are considered along with search-and-rescue operations, standard frequency and time satellites, the search for extraterrestrial intelligence, and the solar-power satellite. The WARC rejected a U.S. allocation proposal for the solar-power satellite on the basis that the proposal was premature because spectrum, biological, and ecological impacts have not yet been fully examined.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: IEEE Transactions on Electromagnetic Compatibility; EMC-23; Aug. 198
    Format: text
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    NASA TECHNICAL REPORTS
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