Aircraft guidance system

Details Aircraft guidance system Aircraft guidance system

1974-10-15

1977-04-12

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343100CL, 343106D, G01S 118

Patent

active

040178625

ABSTRACT:
A ground installation for an aircraft landing system has an array of transmitting elements located on the arc of a circle. When the elements are activated sequentially either in one direction ("to") or the other ("fro"), a signal is transmitted which, when mixed with a reference signal, produces a wave train in the aircraft having varying beat frequency. Cross-correlating two wave trains, produced by consecutive to and fro excitations, to establish the time delay between them can be used to establish positional information for an aircraft.

REFERENCES:
patent: 3670337 (1972-06-01), Earp et al.
patent: 3704465 (1972-11-01), Masak et al.

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