Positioning System Using TOA and AOA to Resolve Multi-Path Errors
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Solution Overview
Problem
Conventional positioning systems face significant errors in calculating the position of a communication device due to multi-path signals, which affect the accuracy of determining the device's location based on received signal strength indication (RSSI).
Innovation Solution
A positioning system that includes a transmitting and receiving part with multiple antennas overhead, a distance calculation part using Time of Arrival (TOA) for bidirectional signals of multiple frequencies, and an angle calculation part using Angle of Arrival (AOA) based on phase differences between signals received by the antennas, to determine the device's position and approach to a side entrance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RSSI-based positioning is used to determine device location, then the system can identify area positions, but multi-path signals cause significant calculation errors reducing positioning accuracy
Solution Approach 1:
The patent changes the measurement parameter from RSSI (received signal strength indication) to TOA (time of arrival) and AOA (angle of arrival). By measuring the time it takes for signals to travel between devices and the angle of signal arrival at multiple antennas, the system achieves more accurate positioning that is not affected by multi-path signal interference, thus resolving the contradiction between measurement precision and calculation reliability
Solution Approach 2:
The patent introduces multiple antennas as intermediary measurement points to capture phase differences of incoming signals. These antennas serve as mediators that enable AOA calculation, providing additional dimensional information that helps distinguish direct-path signals from multi-path signals, thereby improving both positioning accuracy and calculation reliability
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 enables accurate calculation of the communication device's position, reducing errors caused by multi-path signals and improving the determination of its proximity to automatic gates, thereby enhancing the accuracy of access control systems.
Implementation Method 1
a distance calculation part configured to calculate a distance between a communication device that can move in the positioning target area, and the transmitting and receiving part, based on results gained from signals of a plurality of frequencies transmitted bidirectionally between the communication device and the transmitting and receiving part
Implementation Method 2
an angle calculation part configured to calculate an angle that indicates a position of the communication device with respect to the transmitting and receiving part, based on a phase difference between the signals received by the plurality of antennas of the transmitting and receiving part
Data Source
AI summary
A positioning system includes: a transmitting and receiving part having multiple antennas and positioned overhead in a positioning target area with a side entrance; a distance calculation part configured to calculate a distance between a communication device that can move in the positioning target area, and the transmitting and receiving part, based on results gained from signals of multiple frequencies transmitted bidirectionally between the communication device and the transmitting and receiving part; an angle calculation part configured to calculate an angle that indicates a position of the communication device with respect to the transmitting and receiving part, based on a phase difference between the signals received by the antennas of the transmitting and receiving part; and a determining part configured to determine whether or not the communication device is approaching the side entrance based on the distance and angle calculated by the distance calculation part and the angle calculation part.