Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1993-06-30
1996-04-09
Issuing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342417, 342432, 342455, G01S 302, G01S 502
Patent
active
055065902
ABSTRACT:
This invention relates to a system to alert an aircraft pilot of the presence and general location of other aircraft that might constitute a collision threat to the pilot's aircraft. A first and second antenna on the upper paid lower surfaces of the aircraft each operate in first and second modes characterized by respective first and second directivity conditions. The first and second antennas directly receive pulse signals from a source in order to determine the relative time of arrivals and thus the relative altitude of the source to the aircraft. Analysis means compares amplitudes of responses in the first and second modes to provide an angle indicating signal without having to generate radio signals other than those already being generated by equipment in the other aircraft in response to ground ATC interrogation.
REFERENCES:
patent: 4379296 (1983-04-01), Farrar et al.
patent: 4828382 (1989-05-01), Vermilion
patent: 5223847 (1993-06-01), Minter
Gillette Donald P.
Issuing Gregory C.
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