Means for accumulating aircraft position data for a beacon based

Details Means for accumulating aircraft position data for a beacon based Means for accumulating aircraft position data for a beacon based

1977-06-28

1978-12-05

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 65R, 343112TC, G01S 956

Patent

active

041288394

ABSTRACT:
A protected aircraft having a discrete address beacon transponder includes a ground base air traffic control radar beacon system (ATCRBS) interrogator, a collocated discrete address beacon system (DABS) transponder and a directional antenna on the protected aircraft. The protected aircraft synchronizes a local clock with the pulse repetition frequency (PRF) and scan rate of the ATCRBS interrogating his field of interest from which information the protected aircraft can calculate the azimuth angle of responding intruder aircraft with respect to the ground station. By means of his directional antenna the protected aircraft also determines the azimuth of the intruder with respect to itself. Interrogation by the protected aircraft of a collocated ground DABS transponder or a DME or other suitable means of measuring range provides a data base which together with the aforementioned azimuth angles permits the protected aircraft to calculate instantaneous position of the intruder relative to his own.

REFERENCES:
patent: 2891246 (1959-06-01), Reed, Jr.
patent: 3792472 (1974-02-01), Payne et al.
patent: 3808598 (1974-04-01), Carter
patent: 3959793 (1976-05-01), Litchford

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