G01S3/60 - CPC Classification

Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves; Systems for determining direction or deviation from predetermined direction; Rotating or oscillating beam systems using continuous analysis of received signal for determining direction in the plane of rotation or oscillation or for determining deviation from a predetermined direction in such a plane Broad-beam systems producing in the receiver a substantially sinusoidal envelope signal of the carrier wave of the beam, the phase angle of which is dependent upon the angle between the direction of the transmitter from the receiver and a reference direction from the receiver, e.g. cardioid system

• G01S3/62 » wherein the phase angle of the signal is indicated by a cathode-ray tube 0
• G01S3/64 » wherein the phase angle of the signal is determined by phase comparison with a reference alternating signal varying in synchronism with the directivity variation 6

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