Bluetooth's AoA (Angle of Arrival) and AoD (Angle of Departure) positioning technologies are advanced methods that use the arrival or departure angle of Bluetooth signals for location estimation. These two technologies use the antenna array and signal processing algorithms built into Bluetooth devices to achieve more accurate and reliable indoor positioning than traditional RSSI positioning. Here is a brief introduction to these two technologies:
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AoA (Angle of Arrival)
Definition: AoA positioning technology determines the location of a device by measuring the arrival angle of the received signal between different antennas on the receiver. This requires that multi-antenna arrays with known geometric configurations be installed on the receiving device and the transmitting device (tag or Beacon).
Working principle: When a Bluetooth signal is sent from a transmitting device and arrives at a receiving device, the multiple antennas on the receiving device receive slightly different signal strengths and arrival times. By analyzing these differences, the angle of arrival of the signal can be calculated, and the location of the transmitting device can be estimated based on this.
Advantages: AoA technology can provide high positioning accuracy, usually within a few meters, and is particularly suitable for scenarios that require high-precision positioning, such as industrial automation, warehouse management, indoor navigation, etc.
AoD (Angle of Departure)
Definition: AoD positioning technology is the opposite of AoA. It controls the antenna array on the transmission device to transmit the signal at a known departure angle. After the antenna array on the receiving device receives these signals, it determines the location of the transmission device by measuring the angle.
Working principle: Compared with AoA, AoD technology requires the transmission device to have a multi-antenna array that can control the transmission direction. By precisely controlling the transmission angle and analyzing the received signal, the location of the transmission device can be accurately located.
Advantages: AoD technology can also provide high positioning accuracy, and compared with AoA, it is easier to control and implement during implementation, especially for positioning systems that require the participation of transmission devices.
Application scenarios
Business and retail: It can be used for indoor navigation, location push services, etc.
Logistics and manufacturing: Tracking and management of assets in factories and warehouses
Smart Buildings: Used to manage and monitor the location and status of facilities.
In summary, Bluetooth's AoA and AoD positioning technologies provide high accuracy and flexibility for indoor positioning, making it possible to accurately locate devices in complex environments by utilizing antenna arrays and complex signal processing algorithms.
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