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  • 1
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    Complementary satellite sound broadcasting systems: A NASA assessment for the Voice of America (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Satellite concepts are examined which offer potentially significant sound broadcast coverage of audio as a complement to VOA's existing and planned terrestrial sound broadcasting system. HF bands are emphasized but additional discussion is included for systems using higher frequencies. Low altitude satellites, shuttle altitude (275 km) and sun synchronous (about 1600 to 1800 km), would not be practical for international broadcasting since many satellites would be required for reliable and widespread coverage. Two concepts are discussed which would offer significant and practical broadcast coverage at HF. One, an 8-hr posigrade equatorial orbit, would offer about 1 hr of widespread, twice daily, coverage to three areas of the globe. The time of coverage is even greater when confined to densely populated areas only (2 to 3 hrs). Another orbit, the Apogee at Constant Time/Equatorial (ACE), provides the same coverage, but only once daily to each area. The latter orbit is highly elliptical, allowing insertion of a greater payload (more broadcast channels) with the existing launch capability. The ACE and 8-hr orbit concepts led to systems of about equal costs, with the ACE being slightly better.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-100300 , E-3948 , NAS 1.15:100300
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An allotment planning concept and related computer software for planning the fixed satellite service at the 1988 space WARC (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Described is a two-phase approach to allotment planning suitable for use in establishing the fixed satellite service at the 1988 Space World Administrative Radio Conference (ORB-88). The two phases are (1) the identification of predetermined geostationary arc segments common togroups of administrations, and (2) the use of a synthesis program to identify example scenarios of space station placements. The planning approach is described in detail and is related to the objectives of the confernece. Computer software has been developed to implement the concepts, and a complete discussion on the logic and rationale for identifying predetermined arc segments is given. Example scenarios are evaluated to give guidance in the selection of the technical characteristics of space communications systems to be planned. The allotment planning concept described guarantees in practice equitable access to the geostationary orbit, provides flexibility in implementation, and reduces the need for coordination among administrations.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-100244 , E-3777 , NAS 1.15:100244
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Numerical Arc Segmentation Algorithm for a Radio Conference-NASARC (version 4.0) technical manual (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The information contained in the NASARC (Version 4.0) Technical Manual and NASARC (Version 4.0) User's Manual relates to the Numerical Arc Segmentation Algorithm for a Radio Conference (NASARC) software development through November 1, 1988. The Technical Manual describes the NASARC concept and the algorithms used to implement the concept. The User's Manual provides information on computer system considerations, installation instructions, description of input files, and program operation instructions. Significant revisions were incorporated in the Version 4.0 software over prior versions. These revisions have further enhanced the modeling capabilities of the NASARC procedure and provide improved arrangements of predetermined arcs within the geostationary orbits. Array dimensions within the software were structured to fit within the currently available 12 megabyte memory capacity of the International Frequency Registration Board (IFRB) computer facility. A piecewise approach to predetermined arc generation in NASARC (Version 4.0) allows worldwide planning problem scenarios to be accommodated within computer run time and memory constraints with enhanced likelihood and ease of solution.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-101453 , E-4736 , NAS 1.15:101453
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Numerical Arc Segmentation Algorithm for a Radio Conference (NASARC), version 4.0: User's manual (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The information in the NASARC (Version 4.0) Technical Manual (NASA-TM-101453) and NASARC (Version 4.0) User's Manual (NASA-TM-101454) relates to the state of Numerical Arc Segmentation Algorithm for a Radio Conference (NASARC) software development through November 1, 1988. The Technical Manual describes the NASARC concept and the algorithms used to implement the concept. The User's Manual provides information on computer system considerations, installation instructions, description of input files, and program operation instructions. Significant revisions were incorporated in the Version 4.0 software over prior versions. These revisions have further enhanced the modeling capabilities of the NASARC procedure and provide improved arrangements of predetermined arcs within the geostationary orbit. Array dimensions within the software were structured to fit within the currently available 12-megabyte memory capacity of the International Frequency Registration Board (IFRB) computer facility. A piecewise approach to predetermined arc generation in NASARC (Version 4.) allows worldwide planning problem scenarios to be accommodated within computer run time and memory constraints with enhanced likelihood and ease of solution.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-101454 , E-4987 , NAS 1.15:101454
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Numerical arc segmentation algorithm for a radio conference-NASARC (version 2.0) technical manual (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The information contained in the NASARC (Version 2.0) Technical Manual (NASA TM-100160) and NASARC (Version 2.0) User's Manual (NASA TM-100161) relates to the state of NASARC software development through October 16, 1987. The Technical Manual describes the Numerical Arc Segmentation Algorithm for a Radio Conference (NASARC) concept and the algorithms used to implement the concept. The User's Manual provides information on computer system considerations, installation instructions, description of input files, and program operating instructions. Significant revisions have been incorporated in the Version 2.0 software. These revisions have enhanced the modeling capabilities of the NASARC procedure while greatly reducing the computer run time and memory requirements. Array dimensions within the software have been structured to fit within the currently available 6-megabyte memory capacity of the International Frequency Registration Board (IFRB) computer facility. A piecewise approach to predetermined arc generation in NASARC (Version 2.0) allows worldwide scenarios to be accommodated within these memory constraints while at the same time effecting an overall reduction in computer run time.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-100160 , E-3722 , NAS 1.15:100160
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Numerical Arc Segmentation Algorithm for a Radio Conference-NASARC, Version 2.0: User's Manual (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The information contained in the NASARC (Version 2.0) Technical Manual (NASA TM-100160) and the NASARC (Version 2.0) User's Manual (NASA TM-100161) relates to the state of the Numerical Arc Segmentation Algorithm for a Radio Conference (NASARC) software development through October 16, 1987. The technical manual describes the NASARC concept and the algorithms which are used to implement it. The User's Manual provides information on computer system considerations, installation instructions, description of input files, and program operation instructions. Significant revisions have been incorporated in the Version 2.0 software over prior versions. These revisions have enhanced the modeling capabilities of the NASARC procedure while greatly reducing the computer run time and memory requirements. Array dimensions within the software have been structured to fit into the currently available 6-megabyte memory capacity of the International Frequency Registration Board (IFRB) computer facility. A piecewise approach to predetermined arc generation in NASARC (Version 2.0) allows worldwide scenarios to be accommodated within these memory constraints while at the same time reducing computer run time.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-100161 , E-3723 , NAS 1.15:100161
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    An allotment planning concept and related computer software for planning the fixed satellite service at the 1988 space WARC (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The authors describe a two-phase approach to allotment planning suitable for use in planning the fixed satellite service at the 1988 Space World Administrative radio Conference (ORB-88). The two phases are (1) the identification of predetermined geostationary arc segments common to groups of administrations and (2) the use of a synthesis program to identify example scenarios of space station placements. The planning approach is described in detail and is related to the objectives of the conference. Computer software has been developed to implement the concepts, and the logic and rationale for identifying predetermined arc segments is discussed. Example scenarios are evaluated to give guidance in the selection of the technical characteristics of space communications systems to be planned. The allotment planning concept described guarantees equitable access to the geostationary orbit, provides flexibility in implementation, and reduces the need for coordination among administrations.
    Keywords: COMMUNICATIONS AND RADAR
    Type: GLOBECOM ''87 - Global Telecommunications Conference; Nov 15, 1987 - Nov 18, 1987; Tokyo; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Millimeter wavelength communications applications for the SEI (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The potentially complex missions of the Space Exploration Initiative (SEI) require advanced lunar communications, navigation, and information systems to provide voice, data, and image transmissions. The objectives here are to determine which SEI telecommunications applications will benefit from millimeter wave technology, assess the state of the art in millimeter wave technology, and describe the technology development shortfalls with respect to potential mission time frames. The assumptions for the analysis as well as other non-performance related issues are also presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-TM-105275 , E-6598 , NAS 1.15:105275 , AIAA PAPER 91-3589 , Conference on Advanced Space Exploration Initiative Technologies; Sep 04, 1991 - Sep 06, 1991; Cleveland, OH; United States
    Format: text
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