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  • 1
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    Shuttle GPS R/PA configuration and specification study (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Changes in the technical specifications for a global positioning system (GPS) receiving system dedicated to space shuttle use are presented. Various hardware functions including acquisition, tracking, and measurement are emphasized. The anti-jam performance of the baseline GPS systems are evaluated. Other topics addressed include: the impact on R/PA design of the use of ground based transmitters; problems involved with the use of single channel tests sets; utility of various R/PA antenna interconnections topologies; the choice of the averaging interval for delta range measurements; and the use of interferometry techniques for the computation of orbiter attitude were undertaken.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-160396 , TR-1080-1779
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    SPS phase control system performance via analytical simulation (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A solar power satellite transmission system which incorporates automatic beam forming, steering, and phase control is discussed. The phase control concept centers around the notation of an active retrodirective phased array as a means of pointing the beam to the appropriate spot on Earth. The transmitting antenna (spacetenna) directs the high power beam so that it focuses on the ground-based receiving antenna (rectenna). A combination of analysis and computerized simulation was conducted to determine the far field performance of the reference distribution system, and the beam forming and microwave power generating systems.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-160582 , TR-7903-0977
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 3
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    Shuttle GPS R/PA evaluation analysis and performance tradeoff study (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Primary responsibility was understanding and analyzing the various GPS receiver functions as they relate to the shuttle environment. These receiver functions included acquisition properties of the sequential detector, acquisition and tracking properties of the various receiver phase locked loops, and the techniques of sequential receiver operation. In addition to these areas, support was provided in the areas of oscillator stability requirements, antenna management, and navigation filter requirements, including preposition aiding.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-CR-151854 , TR-0978-0278
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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