Automatic direction finder

Details Automatic direction finder Automatic direction finder

1982-12-06

1986-02-25

Jordan, Charles T.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343448, G01S 504

Patent

active

045730539

ABSTRACT:
An automatic direction finder capable of measuring a direction with a higher accuracy is disclosed. In an initial measurement, loop antennas and a vertical antenna are used in a conventional manner. However, in a final measurement the vertical antenna adversely affected by the surrounding disturbances is not employed and only the loop antennas are used. The disclosed finder includes a switching device for disconnecting the vertical antenna in the final measurement. The finder is also provided with a pair of search coils disposed perpendicular to each other. One of the search coils is connected to a combining circuit via the switching device, while the other is connected to the combining circuit via a balanced modulator.

REFERENCES:
patent: 2384317 (1945-09-01), Lear
patent: 2943323 (1960-06-01), Ryan
patent: 3328799 (1967-06-01), Green et al.
patent: 3553699 (1971-01-01), Starley et al.
patent: 3761931 (1973-09-01), Hisatsu
patent: 3816833 (1974-06-01), Ryan
patent: 3967280 (1976-06-01), Mayer et al.
patent: 4302759 (1981-11-01), Mori et al.
patent: 4306240 (1983-12-01), Yasuda et al.
patent: 4368470 (1983-01-01), Mori et al.

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