Cooperative type anti-collision radio system

Details Cooperative type anti-collision radio system Cooperative type anti-collision radio system

1976-06-23

1978-08-01

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

325 22, G08G 504

Patent

active

041046382

ABSTRACT:
A cooperative type aircraft anti-collision radio system utilizes radio transmitters and receivers transmitting and receiving on a single radio frequency common to most aircraft having radio systems or on multiple radio frequencies if desired. Each aircraft will be capable of transmitting at least one and preferably a plurality of selected tones which may be received by appropriate radio receiver circuitry of other aircraft operating in the vicinity. Conventional automatic direction finding circuitry ascertains the bearing of the aircraft transmitting a modulated tone or tones which is displayed for visual inspection. By interpreting changes in the bearing of the aircraft transmitting the tone or tones and/or by interpreting the strength of the signals being received a decision may be made whether or not evasive action is required in order to avoid a collision. The decision may also be made automatically by computer depending upon the degree of sophistication desired advising the pilot to fly his aircraft upwardly, downwardly, to the right, left, or level in order to avoid collision. For aircraft including both transmitter and receiver circuitry the transmitter and receiver are both operative through a plurality of switching circuits provided one for each of the tones being transmitted and received. The switching circuits are energized according to codes that are unique to each aircraft so the codes of two aircraft will never correspond exactly thereby assuring reception of at least one position signal between any two aircraft equipped with transmitting and receiving anti-collision radio systems.

REFERENCES:
patent: 2894258 (1959-07-01), Vantine, Jr. et al.
patent: 3227954 (1966-01-01), Fichter, Jr.
patent: 3584302 (1971-06-01), Lundgren
patent: 3646508 (1972-02-01), Da Silva
patent: 3750168 (1973-07-01), Schrader et al.
patent: 3757339 (1973-09-01), Shear et al.
"Avionics Navigation Systems", M. Kayton & W. R. Fried, John Wiley & Sons Inc., New York, pp. 605-608.

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