Broad-beam systems producing at a receiver a substantially continuous sinusoidal envelope signal

Official title: Broad-beam systems producing at a receiver a substantially continuous 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 receiver from the beacon and a reference direction from the beacon, e.g. cardioid system

G01S1/46 (Broad-beam systems producing at a receiver a substantially continuous sinusoidal envelope signal) appears on 66 US grants and 22 published applications in this corpus.