Two-frequency instrument landing system with integral monitor

Details Two-frequency instrument landing system with integral monitor Two-frequency instrument landing system with integral monitor

1975-09-02

1977-06-28

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 116, G01S 118

Patent

active

040329208

ABSTRACT:
A two-frequency capture-effect instrument landing system employs a single localizer antenna array for both course-frequency and clearance-frequency radiation. The composite course and clearance signals are formed by networks that utilize trees of hybrid power dividers to effect unequal power division and distribute the signals to the antenna feeders. Integral monitoring is provided by similar networks, operating backwards in a functional sense, which recombine samples of the RF energy on the antenna elements and separate the same into the basic, frequency-separated course and clearance signal components. Redundant monitoring for antenna fault detection is provided by detecting RF signal levels on unused ports of the monitor circuit power dividers.

REFERENCES:
patent: 3713160 (1973-01-01), Becavin
patent: 3866228 (1975-02-01), Alford

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