Radio interferometer sector-definition

Details Radio interferometer sector-definition Radio interferometer sector-definition

1974-11-13

1976-07-20

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343114, G01S 348

Patent

active

039710270

ABSTRACT:
A vertical radio-interferometer sector-definition system, using an array of aerial elements which are arranged in a vertical straight line and are symmetrically disposed about the center of the array, which is unaffected by ground-reflected indirect-path signals.
If .theta. is the angle of arrival, by a direct path, of a signal and p is the ground reflection coefficient, then from a symmetrical pair of aerial elements is derived a product of two functions f.sub.1 (.theta.).f(p) and from another symmetrical pair is derived another product f.sub.2 (.theta.).f(p): division of one product by the other "cancels out" f(p) to provide a quotient signal which is a function of .theta. but not of p. Either or both product functions may be derived with or without the aid of a central element.

REFERENCES:
patent: 3406397 (1968-10-01), Easton et al.
patent: 3742505 (1973-06-01), Rocke
patent: 3803612 (1974-04-01), Alcock et al.
patent: 3889267 (1975-06-01), Lucas et al.

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