Apparatus and method for use in instrument landing system locali

Details Apparatus and method for use in instrument landing system locali Apparatus and method for use in instrument landing system locali

1984-06-25

1986-04-29

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343411, 343413, G01S 114, G01S 116, G01S 118

Patent

active

045860491

ABSTRACT:
Apparatus and method for use in instrument landing system (ILS) localizer and/or glide-slope receivers for deriving course deviation information are described. Specifically, a detected incoming ILS (localizer or glide-slope) signal is first filtered in order to extract appropriate 90 and 150 Hz navigation tones therefrom. Thereafter, two streams of timing pulses are generated; the first stream is phase-locked to the 90 Hz navigation tone and the second stream is phase-locked to the 150 Hz navigation tone. The peak amplitude of the 90 Hz navigation tone is sampled in response to the occurrence of a particular timing pulse occurring in the first pulse stream and the peak amplitude of the 150 Hz navigation tone is sampled in response to the occurrence of a particular timing pulse occurring in the second pulse stream. The sampled values of both navigation tones are then combined to obtain the difference therebetween which, in turn, is used to produce a signal which represents the actual localizer or glide-slope course deviation.

REFERENCES:
patent: 3323125 (1967-05-01), Lunn et al.
patent: 3413638 (1968-11-01), Trim
patent: 3934250 (1976-01-01), Martin, Jr.
patent: 3946387 (1976-03-01), Drucker
patent: 4520361 (1985-05-01), Frazita

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