Doppler VOR beacons

Details Doppler VOR beacons Doppler VOR beacons

1974-08-19

1976-12-21

La Roche, Eugene

Communications: radio wave antennas

Antennas

Plural antennas spaced a fractional or full wave length apart

343102, 343106R, 343106D, G01S 140

Patent

active

039991873

ABSTRACT:
A Doppler VOR beacon comprising a central antenna modulated with a reference wave and a ring of omnidirectional antennas radiating sidebands of a sub-carrier amplitude modulation of the carrier commutated around the ring of antennas to simulate a rotating source, in which the central antenna in comparison with the ring antennas has a higher gain towards the horizon and over a predetermined angle above the horizon. The central antenna may comprise a vertically stacked array, the elements of which may be Alford loops.

REFERENCES:
patent: 3281843 (1966-10-01), Plummer
patent: 3474446 (1969-10-01), Shestag et al.
Colin et al., Principles of Tacan, Article in "Electrical Communication", vol. 33 No. 1, Mar. 1956, p. 24.

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