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  • COMMUNICATIONS  (3)
  • LAUNCH VEHICLES AND SPACE VEHICLES  (1)
  • 1
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    The role of time-frequency in satellite position determination systems. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Tests were conducted by NASA on radio navigation satellite systems that employ the use of time-frequency determination. The satellites used for this purpose were the ATS 1 and 3, and the Nimbus 3 and 4. Several systems were tested in order to examine the feasibility of three satellite navigation concepts: (1) multiple satellite range measurements, (2) satellite range rate, or range and range rate measurements and (3) satellite angle measurements. Test results indicate that locations of ships and aircraft can be determined to within 3-5 km, one sigma, by these satellite methods, and that location accuracy is both a function of the RF employed and of the extent of knowledge of the satellite orbit.
    Keywords: COMMUNICATIONS
    Type: IEEE; vol. 60
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Satellite aids for aviation. (1968)
    In:  Other Sources
    Details
    Publication Date: 2011-08-12
    Description: Satellite system providing combined communications, weather and navigational services for commercial aircraft
    Keywords: COMMUNICATIONS
    Type: ; ECTRON (
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Communication and terrestrial navigation applications from earth orbiting spacecraft. (1965)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Unmanned and manned satellites for communication and terrestrial navigation, noting future plans of NASA
    Keywords: COMMUNICATIONS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Satellites for distress alerting and locating: Report by Interagency Committee for Search and Rescue Ad Hoc Working Group (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The background behind the congressional legislation that led to the requirement for the Emergency Locator Transmitter (ELT) and the Emergency Position-Indicating Radio Beacon (EPIRB) to be installed on certain types of aircraft and inspected marine vessels respectively is discussed. The DAL problem is discussed for existing ELT and EPIRB equipped aircraft and ships. It is recognized that the DAL requirement for CONUS and Alaska and the maritime regions are not identical. In order to address the serious DAL problem which currently exists in CONUS and Alaska, a low orbiting satellite system evolves as the most viable and cost effective alternative that satisfies the overall SAR system design requirements. A satellite system designed to meet the needs of the maritime regions could be either low orbiting or geostationary. The conclusions drawn from this report support the recommendation to proceed with the implementation of a SAR orbiting satellite system.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: NASA-TM-74770
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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