Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1978-02-09
1979-07-17
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343112CA, G01S 956
Patent
active
041617290
ABSTRACT:
By adding an indicator control panel to the cockpit and a small receiver-decoder unit between the transponder and the antenna of aircraft having a conventional air traffic control radar beacon system transponder, mid-air collision avoidance capability is obtained. The BACAS (Beacon Add-on Subsystem for Collision Avoidance System) receiver-decoder unit in an aircraft interrogates the associated ATC (Air Traffic Control) transponder to obtain and store the ATCRBS Mode C reply altitude information. The 1090 MHz transponder Mode C reply is given 5 MHz on-off amplitude modulation by the receiver-decoder unit and is radiated into space through the ATC antenna. Identical BASCAS hardware in aircraft within range sense the specially-modulated (5 MHz), Mode C reply and immediately act to trigger their respective ATC transponders into emitting Mode C replies with essentially the same special modulation characteristics except for a different modulation frequency (10 MHz). The replies emitted by other aircraft are sensed by the BASCAS receiver in the initial aircraft, and the Mode C altitude information from each aircraft is compared to the initially stored Mode C data. Any aircraft within a relatively small radius having an altitude separation of 500 feet or less will cause a BASCAS unit to alert the pilot. The BASCAS unit will also illuminate a "CLIMB" or "DIVE" light when the relative altitude orientation can be determined from the altitude data comparison.
REFERENCES:
patent: 3579235 (1971-05-01), Straub et al.
patent: 3792472 (1974-02-01), Payne et al.
patent: 3875570 (1975-04-01), Litchford
patent: 3882497 (1975-05-01), Klass et al.
patent: 3959793 (1976-05-01), Litchford
patent: 4107674 (1978-08-01), Funatsu et al.
Duncan Robert Kern
Rusz Joseph E.
Tubbesing T. H.
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