Method and apparatus for adjustment of modulation course pattern

Details Method and apparatus for adjustment of modulation course pattern Method and apparatus for adjustment of modulation course pattern

1974-08-26

1976-03-23

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343108R, G01S 114

Patent

active

039463877

ABSTRACT:
A method and apparatus for adjusting the modulation signal levels of overlapping beams which define along points of equal signal levels within the overlap a directional axis which in turn defines a desired navigation course for an airplane or similar maneuverable apparatus. At points offset from the directional axis, one or the other of the modulation signals will be greater in magnitude, depending on the direction of offset. The included angle between the two locus of points representing a predetermined difference in magnitude between the two modulating signals over the region between the landing field and the farthest reach of the beams defines the modulation course width for that particular difference in magnitude. In the illustrated embodiments, such a modulation course width may be effectively increased or decreased for a given antenna configuration and a given directional axis by altering the magnitudes of the modulation signals such that the difference in modulation levels is decreased or increased throughout the area of beam overlap. This is accomplished by introducing a portion of the modulation signal from one beam forming circuit into the other beam forming circuit, and viceversa, such that each radiated beam includes components of both modulation signals.

REFERENCES:
patent: 3482247 (1969-12-01), Thompson
patent: 3760419 (1973-09-01), Poschadel et al.

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