Bluetooth AoA Positioning for Indoor Spatial Mapping
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Solution Overview
Problem
Conventional methods for determining the position of devices in environments with many small paths, such as shopping malls and underground areas, face accuracy issues due to the limitations of GPS, especially in bad weather or indoors, where signal occlusion and interference reduce performance.
Innovation Solution
A display system and method that utilize Bluetooth 5.1 technology for short-range wireless communication between an information processing terminal and a communication device, employing Angle of Arrival (AoA) and Angle of Departure (AoD) detection methods to calculate the relative position and angle between devices, enabling accurate position determination on a spatial map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS is used for position determination, then position information can be obtained in open areas, but accuracy deteriorates in environments with signal occlusion such as indoors and underground areas
Solution Approach 1:
The patent introduces Bluetooth communication devices as intermediary elements deployed throughout the target area. These devices receive and process wireless signals from the terminal device, using angle of arrival (AoA) and angle of departure (AoD) detection to determine relative positions. This intermediary system enables accurate positioning in environments where GPS signals are blocked, effectively mediating between the terminal device and the positioning objective.
2Measurement precision
If conventional distance identification using Bluetooth signal strength is used, then simple distance estimation is achieved, but accuracy is insufficient for precise position determination
Solution Approach 1:
The patent transitions from using signal strength (RSSI) as the primary parameter for distance estimation to using angle of arrival (AoA) and angle of departure (AoD) parameters. By changing the measured parameters from intensity-based to geometry-based measurements, the system achieves significantly higher positioning accuracy. The communication devices calculate relative positions using angular information and distance data, providing precise location determination without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides high accuracy in position detection even in conditions where GPS performance is poor, enhancing user convenience by accurately displaying the current position on a map.
Implementation Method 1
wireless communication using Bluetooth (registered trademark)
Implementation Method 2
employing Angle of Arrival (AoA) and Angle of Departure (AoD) detection methods to calculate the relative position and angle between devices
Implementation Method 3
employing Angle of Arrival (AoA) and Angle of Departure (AoD) detection methods to calculate the relative position and angle between devices
Data Source
AI summary
A display system comprising a communication device and an information processing terminal operable to communicate with the communication device. An acquiring unit, based on information related to an angle between the information processing terminal and the communication device, which is obtained from advertising information communicated between the information processing terminal and the communication device on a floor, acquires information indicating a relative position between the information processing terminal and the communication device. A display control unit causes a display unit of the information processing terminal to display a spatial map. The display control unit, based on the information indicating the relative position acquired by the acquiring unit, causes a position of the information processing terminal to be displayed on the spatial map.