Accession Number : AD0743093

Title :   Technical Evaluation of Dual Input Transponder.

Descriptive Note : Final rept. Jul 69-May 70,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Blazej,Jules E.

Report Date : APR 1971

Pagination or Media Count : 78

Abstract : The Dual Input Transponder was evaluated to determine if it, in conjunction with upper and lower aircraft antennas, could resolve existing Air Traffic Control Radar Beacon System antenna coverage problems by minimizing aircraft antenna shielding phenomena. Flight tests of the DIT and other comparative transponder-antenna configurations were conducted at the National Aviation Facilities Experimental Center (NAFEC), and included several types of manuevers intended to place the test aircraft in numerous shielding attitudes. Results of the test program indicated that the DIT effectively minimized the loss of transponder replies caused by shielding of the antennas and provided essentially uninterrupted antenna coverage. A limited number of tests with two independently operated transponders and two antennas indicated that this configuration resulted in less apparent shielding effects than the DIT system. (Author)

Descriptors :   (*TRANSPONDERS, RELIABILITY(ELECTRONICS)), (*AIR TRAFFIC CONTROL SYSTEMS, *AIRPORT RADAR SYSTEMS), AIRCRAFT ANTENNAS, RADAR BEACONS, FLIGHT TESTING, TURNING FLIGHT, RADAR TARGETS, RADAR CROSS SECTIONS, PLAN POSITION INDICATORS

Subject Categories : Acoustic Detection and Detectors
      Air Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE