Accession Number : AD0775290

Title :   Report on DABS/ATCRBS (Discrete Address Beacon System/Air Traffic Control Radar Beacon System) Field Testing Program.

Descriptive Note : Project rept.,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Samson,J. R. ; Crocker,E. A.

Report Date : 13 FEB 1974

Pagination or Media Count : 52

Abstract : The purpose of the field test program was to verify laboratory measurements of the effect of discrete address beacon system uplink signal formats on air traffic control radar beacon system transponders. The DABS interrogations tested were: (1) a combined ATCRBS Mode A/DABS All-Call consisting of a standard Mode A interrogation with an additional pulse following the P sub 3 pulse; (2) a DABS uplink message transmission consisting of a P sub 1-P sub 2 pulse pair followed by 25 microseconds of 4 megabit per second DPSK data modulation. The timing aspects of these waveforms were selected on the basis of a previous series of laboratory bench tests made in a small cross-section of the ATCRBS transponder population. The results of these field measurements performed on a larger cross-section of field operational ATCRBS transponders agree with the results of the bench testing program: The recommended DABS uplink transmissions result in an effective combined ATCRBS/DABS All-Call mode and minimum triggering of ATCRBS transponders by DABS message transmissions. (Author)

Descriptors :   *Air traffic control systems, Radar beacons, Data links, Transmitting, Electromagnetic compatibility, Transponders

Subject Categories : Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE