Precision landing system

Details Precision landing system Precision landing system

1993-10-04

1995-12-12

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

G01S 116, G01S 118

Patent

active

054753937

ABSTRACT:
An aircraft landing system employs an array of antennas aligned across the runway, and equipment on board the aircraft employs radio interferometry to measure path length differences between the aircraft and selected pairs of the antennas. The antennas each include circuitry for sideband modulation of a basic FM signal so that each antenna radiates a pair of sidebands displaced above and below the basic signal by a respective number of increments. The FM signal can be carried on an X-band carrier of nominally ten GHz, with a frequency deviation of .+-.250 MHz and a modulating frequency of 20 Hz. Further antennas provide taxiing guidance. Data can be communicated on the system.

REFERENCES:
patent: 3564543 (1971-02-01), Nehama
patent: 3680120 (1972-07-01), Benjamin
patent: 3697997 (1972-10-01), Cooper
patent: 3713159 (1973-01-01), Hoffman
patent: 3798646 (1974-03-01), Buehler
patent: 3887922 (1975-06-01), Hofgen et al.
patent: 3965443 (1976-06-01), Towle et al.
patent: 3971025 (1976-07-01), Levine

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