Doppler-Effect Omnirange

This paper describes an omnirange of a new design in which the transmitting antenna is caused either to move, or to appear to move along a circular path to produce low-deviation FM by Doppler effect. The FM envelope phase of the transmitted signal is directionally characterized. Deviation-expansion and selective-degeneration in an AFC circuit are used at the receiver to detect the minute directional FM in the presence of FM noise of much larger deviation. Advantages of the new omnirange include improved resolution, accuracy and ease of multiplexing.