Techniques were developed and applied in making trade-off evaluations of the overall synchronization effectiveness of various levels of airborne vs ground-based hierarchal time relaying equippage. It is shown that the number of ground-based master stations required to supply a desired level of synchronization coverage to all aircraft (hierarchal and non-hierarchal), increases rapidly as the number of hierarchal aircraft is diminished. Trade-off studies were made of the master station site selection algorithms. It was shown that the priority algorithm is very near optimum. However, choices of alternate sets of sites (such as air traffic hubs) can be used to obtain operational or economic advantages with only slight reduction in overall effectiveness. Analytic and computational processes developed in Phases I and II were extended to evaluate the effects of atypical operations: master station outages, reduction in hierarchal support due to airline outage and weather. In all cases, hierarchal interconnection provided a high degree of redundancy and the overall system exhibited little loss in effectiveness under abnormal conditions. NTSB records of aircraft collisions indicated that a high level of coverage could be supplied by five master stations complemented by larger aircarrier equipped with hierarchal equipment. (Author)

  • Supplemental Notes:
    • See also AD-779 538.
  • Corporate Authors:

    Society of Naval Architects of Japan

    23 Shiba-kotohiracho, Minato-ku
    Tokyo 135,   Japan 

    Federal Aviation Administration

    Systems R&D Service, 800 Independence Avenue, SW
    Washington, DC  United States 
  • Authors:
    • Holt, J M
    • Watson, F D
  • Publication Date: 1974-5

Media Info

  • Pagination: 75 p.

Filing Info

  • Accession Number: 00080278
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: Phase 3 Final Rpt.
  • Contract Numbers: DOT-FA73WA-3172
  • Files: NTIS, USDOT
  • Created Date: Jan 29 1975 12:00AM