Low cost microwave receiver for ILS

Details Low cost microwave receiver for ILS Low cost microwave receiver for ILS

1974-10-23

1976-06-29

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343109, 333 73S, G01S 116, G01S 118

Patent

active

039672786

ABSTRACT:
In an instrument landing system (ILS), an aircraft is provided with apparatus for receiving from a ground-based transmitter overlapped modulated beam signals, which, when processed by the receiver, provide information about the position of the aircraft relative to a desired navigation course. Provided in the aircraft receiver apparatus is an antenna for receiving the transmitted beam signal, and an RF amplifer for amplifying the received signals. The received signal energy is divided between two recovery lines, each recovery line being routed near a separate series of ring filters, with the ring filters adjacent one recovery line substantially eliminating the signal energy in that line associated with one of the beams, and the ring filters adjacent the other recovery line substantially eliminating the signal energy in that line associated with the other beam. The remaining signals in each recovery line are then detected and applied through follow-on amplifying and filtering circuits to visual indicators for display of ILS information.

REFERENCES:
patent: 3505676 (1970-04-01), Perkins
patent: 3611197 (1971-10-01), Moore et al.
patent: 3713160 (1973-01-01), Becavin
patent: 3715757 (1973-02-01), Toman
patent: 3787841 (1974-01-01), Buehler et al.
patent: 3796970 (1974-03-01), Snell, Jr.
patent: 3824594 (1974-07-01), Hundley

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