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angle of arrival (location) (AoA)

Angle of Arrival (AoA) is a positioning method based on angular measurement of the incident radio signal and is used in mobile communications technology for Location Based Services( LBS) and for short-range radar in automotive technology.

The AoA method determines the angle from which the radio signal is coming or the radar signal is reflected. This is why this method is also called Direction of Arrival( DoA). The AoA measurement works with directional antenna arrays that have a wide aperture angle. All antennas of the antenna array are arranged next to each other at a distance of half the wavelength. They receive the reflected radio signal simultaneously and evaluate the minimum transit time differences or the phase differences between the received signals of the individual antennas. If the received signals have no phase shifts, then the reflected signal hits all antennas perpendicularly and has no angulation.

Methods for RF-based distance measurement and object location

Methods for RF-based distance measurement and object location

The location of the object is determined from the phase differences of the signals with respect to each other and their angles. AoA methods have the disadvantage that they provide perfect results only with line-of-sight( LOS). The resolution of the localization is about 300 m to 500 m.

The AoA method uses cellular networks, WLANs or Bluetooth. It has the advantage that it can also be used indoors or in halls, as can the AoD method, which stands for Angle of Departure (AoD).

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Englisch: angle of arrival (location) - AoA
Updated at: 31.10.2018
#Words: 234
Links: positioning, method, measurement, signal, mobile communications
Translations: DE
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