Wireless Positioning Calibration via Phase and Antenna Spacing Error Compensation
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Solution Overview
Problem
Existing indoor positioning systems using channel state information (CSI) face accuracy issues due to errors caused by antenna hardware circuits and spacing variations, which are not effectively compensated by current technologies.
Innovation Solution
A wireless positioning calibration system and method that employs a sniffer base station to receive CSI from transmission base stations and a positioning server to calculate and compensate phase errors and antenna spacing errors, improving positioning accuracy by using calibrated CSI for user device location determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI positioning is used to improve indoor positioning accuracy, then positioning accuracy is improved, but phase errors and antenna spacing errors caused by hardware circuits reduce positioning accuracy
Solution Approach 1:
The patent implements a feedback mechanism where the positioning server receives CSI from sniffer base stations, calculates phase errors and antenna spacing errors, and uses these calculated errors to compensate future positioning measurements. This closed-loop feedback system continuously improves positioning accuracy by correcting systematic hardware errors.
Solution Approach 2:
The patent introduces sniffer base stations as intermediary devices that capture and report CSI to the positioning server. These intermediaries enable the system to measure and characterize hardware errors without affecting the normal positioning function, acting as a separate measurement channel.
2Adaptability or versatility
If antenna spacing is altered to adapt to different configurations, then adaptability is improved, but measurement precision deteriorates due to increased error rate
Solution Approach 1:
The patent dynamically adjusts positioning parameters based on measured antenna spacing errors. The system calculates error compensation values from CSI measurements and applies these parameter adjustments to correct positioning results, allowing the system to adapt to different antenna configurations while maintaining accuracy.
3Measurement precision
If re-measuring of antenna spacing is performed to maintain accuracy, then positioning accuracy is maintained, but loss of time increases
Solution Approach 1:
The patent performs preliminary error characterization by having sniffer base stations continuously capture CSI and calculate phase errors and antenna spacing errors in advance. These pre-calculated error parameters are stored and applied to future positioning measurements, eliminating the need for frequent re-measuring and reducing time loss.
Data Source
AI summary
Provided is a wireless positioning calibration system, including a plurality of transmission base stations, at least one sniffer base station and a positioning server. The at least one sniffer base station receives a plurality of channel state information (CSI) transmitted by the plurality of transmission base stations. The positioning server receives the plurality of CSI transmitted by the at least one sniffer base station. The positioning server calculates a phase error and an antenna spacing error generated by the at least one sniffer base station by means of the plurality of CSI, and compensates the phase error and the antenna spacing error. A wireless positioning calibration method is also provided.