A REVIEW AND ANALYSIS OF THE MCDONNELL DOUGLAS COLLISION AVOIDANCE SYSTEM. PHASE II

The study represents the second phase of IDA's evaluation of the Collision Avoidance System (CAS) development by the McDonnell Douglas Electronics Company (MDEC). The MDEC CAS is an air-derived synchronous system based on time/frequency multiplexing techniques - synchronization timing is disseminated by ground stations and by air-to-air relay among appropriately equipped aircraft. Range-rate measurement accuracies were re-examined because of the design changes, i.e., replacement of doppler measurements with range difference measurements. Synchronization was addressed in some detail to complement the Phase I study. In particular, the limitations imposed by transmitter power, antenna nulls/fades, and receiver sensitivity were analyzed in the context of the air-to-air synchronization relay links. Ultimately, the analysis led to the question: 'What happens when there is no synchronization and the asynchronous Back-Up Mode (BUM) will have to be invoked'. For this reason, a portion of the study was devoted to the analysis of the BUM.

  • Supplemental Notes:
    • See also Phase 1, AD-021 678.
  • Corporate Authors:

    Institute for Defense Analyses

    400 Army Navy Drive
    Arlington, VA  USA  22202

    Federal Aviation Administration

    Systems R&D Service, 800 Independence Avenue, SW
    ,   USA 

    Department of Defense

    Advanced Research Projects Agency
    Arlington, VA  USA  22209
  • Authors:
    • Krinitz, A
  • Publication Date: 1975-10

Media Info

  • Pagination: 88 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00094468
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FAA-RD-75-143-2 Final Rpt., S-458
  • Contract Numbers: DAHC15-73-C-0200
  • Files: NTIS, TRIS, USDOT
  • Created Date: Apr 21 1976 12:00AM