BCAS is a DABS-based airborne collision avoidance system that exploits the features of DABS discrete addressing and integral data link. This provides for a CAS with the unique capabilities of (1) cooperative threat resolution between BCAS and conflicting aircraft through the transmission of maneuver intent (to DABS-only aircraft) and tie breaking (with other BCAS aircraft) and (2) coordination of CAS activides with the ground ATC control function through the DABS air-ground-air data link. All beacon-equipped aircraft in the vicinity of the BCAS are detected. ATCRBS-equipped aircraft are interrogated using a special Mode C interrogation. DABS aircraft are detected passively through periodic squitters emitted by all DABS transponders. Squitter-detected aircraft are tracked on altitude and only those aircraft that represent a co-altitude threat are discretely interrograted to establish a range/ altitude track. The use of discrete addressing eliminates synchronous garble for the BCAS in the same manner as for DABS. This document provides a general description of BCAS from the viewpoint of its operational features and then describes the avionics package required to achieve this capability. (Author)

  • Corporate Authors:

    Lincoln Laboratory

    Massachusetts Institute of Technology
    Lexington, MA  United States  02173
  • Authors:
    • ORLANDO, V A
    • WELCH, J D
  • Publication Date: 1976-3-23

Media Info

  • Pagination: 22 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00133028
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FAA-RD-76-2 Proj. Rpt., ATC-62
  • Contract Numbers: F19628-76-C-0002, DOT-FA72WAI-261
  • Files: NTIS, TRIS
  • Created Date: Jun 23 1976 12:00AM