A Method of Determining the Angle of Arrival

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Abstract
A method is presented for determining the angle of arrival of the direct and reflected wave for line of sight cases. The method assumes one direct and one reflected wave. The phase difference equipment, as developed by the Electrical Engineering Research Laboratory, measures the difference in phase at 3.2‐cm wave‐length between two points separated vertically by ten feet [F. E. Brooks, Jr. and C. W. Tolbert, Equipment for Measuring Angle‐of‐Arrival by the Phase Difference Method, Electrical Engineering Research Laboratory, Report No. 2, May 1946] and the signal strength at each point. The normal procedure involves the raising of either transmitter or receiver while the other is held at a fixed level. The data to which the method is applied were collected at the Navy Electronics Laboratory desert site near Gila Bend, Arizona, during April 1947. The results are compared to calculations based on the meteorologically measured distribution of the refractive index and ray theory.

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