Radio direction finding system

Details Radio direction finding system Radio direction finding system

1982-12-23

1985-11-05

Blum, Theodore M.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343368, G01S 354

Patent

active

045517274

ABSTRACT:
A radio direction finding system based on the doppler frequency shift principle is disclosed which utilizes a polygonal shaped antenna array and a conventional FM receiver. Voltages from each antenna are combined in an rf summing circuit which may be located remotely from the antenna. Audio output from the FM receiver is processed to measure the phase angle of the commutation frequency phase modulation imparted to the rf receiver input signal by gain variations within the rf summer circuit. Bearing angle proportional to the measured phase angle is displayed in a circular array of light emitting diodes and a three digit decimal display and is provided for recording or remote display through a serial interface.

REFERENCES:
patent: 2414798 (1947-01-01), Budenbom
patent: 2481509 (1949-09-01), Hansel
patent: 3157878 (1964-11-01), Hansel et al.
patent: 4041496 (1977-08-01), Norris

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