Angle-Based Positioning with Distance-Weighted Base Stations
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Solution Overview
Problem
Existing positioning techniques that rely on radio wave intensity for improved accuracy face challenges in environments where radio wave intensity cannot be obtained or fluctuates significantly, limiting the ability to achieve precise positioning.
Innovation Solution
A positioning system that utilizes relative angles between a communication device and multiple base stations to calculate a provisional position, applies weighting coefficients based on distance to correct this position, and finally determines the device's position through a weighted least-squares method, reducing the influence of distant base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radio wave intensity is used for positioning, then positioning accuracy is improved in stable environments, but positioning accuracy deteriorates in environments where radio wave intensity cannot be obtained or fluctuates greatly
Solution Approach 1:
The patent changes the measurement parameter from radio wave intensity (RSS) to angle information (AoA). By using angle of arrival measurements from multiple base stations, the system achieves positioning capability that is not affected by radio wave intensity fluctuations or unavailability, thus resolving the contradiction between accuracy in stable environments and reliability in unstable environments.
2Reliability
If angle information from multiple base stations is used, then positioning can be achieved without radio wave intensity, but measurement noise and distance-related errors increase
Solution Approach 1:
The patent implements a feedback mechanism through iterative optimization. The initial position estimate is used to calculate distances, which then inform the weighting coefficients for the next iteration. This feedback loop allows the system to progressively refine the position estimate, compensating for measurement noise and distance-related errors in angle information.
Solution Approach 2:
The patent introduces weighting coefficients that dynamically adjust the influence of each base station's angle measurement based on its distance to the target. By changing the parameter from uniform weighting to distance-based weighting, the system reduces the impact of distant base stations with higher measurement errors, thereby improving overall positioning accuracy.
3Ease of operation
If uniform weighting is applied to all base stations, then calculation is simplified, but positioning accuracy deteriorates due to equal influence of distant and close base stations
Solution Approach 1:
The patent applies local quality by assigning different weighting coefficients to different base stations based on their individual characteristics, specifically their distance to the target. Instead of uniform weighting, each base station's contribution is locally optimized according to its reliability, with closer base stations receiving higher weights and distant ones receiving lower weights, thus improving positioning accuracy.
Data Source
AI summary
A relative angle acquisition unit (110) acquires a relative angle (31) between each base station of a plurality of base stations and a communication device. A provisional position calculation unit (120) calculates a position of the communication device as a provisional position (32), using the relative angle (31) and a position of each base station. A weight calculation unit (130) calculates a distance between each base station and the communication device, using the position of each base station and the provisional position, and calculates a weighting coefficient (33) for correcting the provisional position (32) for each base station, based on the distance between each base station and the communication device. A device position calculation unit (140) calculates the position of the communication device as a device position (34), using the relative angle (31), the position of each base station, and the weighting coefficient (33).