Angle of Arrival

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Angle of Arrival

A measure of the direction of propagation of electromagnetic radiation upon arrival at a receiver (most commonly used in radio). It is the angle between the plane of the phase front and some plane of reference, usually the horizontal, at the receiving antenna. This angle is a function of the index of refraction gradient of the medium through which the energy is traveling, and the relative positions of the transmitter and receiver. Compare angle of incidence.
Angles of arrival can be measured for both the direct and reflected components of a wave using a multiple-antenna receiving system called an interferometer .


This article is based on NASA's Dictionary of Technical Terms for Aerospace Use