Radio direction finding apparatus

Details Radio direction finding apparatus Radio direction finding apparatus

1974-04-17

1976-03-23

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 348

Patent

active

039463958

ABSTRACT:
A circle arc array of element antennas is capable of receiving at all times radio signals from a source located anywhere in a wide angle or complete circle of azimuth directions, the direction of arrival of a received signal being indicated by radio receiving equipment. The source signal received by each element antenna is directed into two or three channels having different phase delays. The output signals from the first channels of all of the element antennas are combined and connected to a first radio receiver, the phase delays in the first channels being equal for all of the element antennas. The output signals from the second channels of all of the element antennas are combined and connected to the input of a second receiver, the phase delays in the second channels all being different from each other in a uniform phase progression. The phase progression corresponds to a clockwise azimuthal progression of the associated element antennas. The phase difference between the signals of the first and second radio receivers indicates the azimuth direction from which the source radio wave is arriving at the antenna array. If desired, counterclockwise-phased output signals from third channels of all of the element antennas may be employed for a redundant indication of azimuth direction of arrival, to reduce errors. Antenna elements may be arranged in the same circular arc array fashion, with the plane of the elements being vertical, in order to measure elevation direction of arrival.

REFERENCES:
patent: 3080559 (1963-03-01), Thor et al.

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