Beacon CAS (BCAS) An Integrated Air/Ground Collision Avoidance System.
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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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
- Flight Control and Instrumentation
- Air Navigation and Guidance