AOA – Angle of Arrival
AOA measurements are used to determine the direction from which a received radio signal originally emanated. Individual elements of an antenna array will utilize TDOA (Time Difference On Arrival) measurements, from which the AOA can then be calculated. In mobile networks, AOA measurements taken at several cell sites can be used together in order to identify the location of a subscriber. This technique is particularly useful for meeting the location accuracy requirements associated with E911 services but does require the subscriber to be in Line of Sight to the cell sites.
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