Automatic direction finding system

Details Automatic direction finding system Automatic direction finding system

G - Physics

01

S

343/110

G01S 3/16 (2006.01) G01S 3/52 (2006.01) G01S 5/02 (2006.01) H01Q 3/24 (2006.01)

Patent

CA 1088654

TITLE AUTOMATIC DIRECTION FINDING SYSTEM ABSTRACT OF THE DISCLOSURE An automatic direction finding system utilizing the doppler principle for indicating the bearing of a radio trans- mission. The system includes an antenna array of three or more antenna elements equally spaced around a circular path. The antenna elements are connected to the input of a receiver through electronically controlled, variable attenuators which are individually adjusted at the same frequency but differing phases so that the array effectively simulates a single anten- na element physically moving along a circular path at a fixed modulation frequency. The receiver includes a mixer-IF stage with the IF output phase locked to a reference frequency so that the absolute time delay through the IF stage is stabi- lized. The signal is then frequency demodulated, and the mod- ulation signal is extracted by a narrow bandpass commutating filter. The phase of the modulation signal is then compared to the phase of the signal controlling one of the variable attenuators to produce a direction indication proportional thereto.

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