Indoor Positioning Reliability via Adaptive Device Selection
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Solution Overview
Problem
Current indoor positioning technologies face challenges such as distance measurement errors in pedestrian dead reckoning, operational complexities with geomagnetic data methods, and accuracy issues due to shadowing in time of flight methods, while phase-based methods are sensitive to multipath and antenna angle.
Innovation Solution
An information processing device that determines the reliability of distance measurements using a phase-based method and selectively chooses communication devices for position measurement, allowing for reselection or switching to alternative methods based on reliability information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase-based distance measurement is used, then measurement precision is improved, but reliability deteriorates due to sensitivity to multipath and antenna angle
Solution Approach 1:
The system changes the parameter of frequency by performing distance measurements at multiple different frequencies. This allows the system to obtain phase characteristics across a frequency range, enabling more robust distance calculation that is less sensitive to multipath effects and antenna angle variations at any single frequency.
Solution Approach 2:
The system calculates reliability information based on the phase characteristics obtained at multiple frequencies and uses this feedback to determine whether reselection of communication devices is required. This feedback mechanism allows the system to adaptively respond to measurement quality and switch to alternative methods when reliability is insufficient.
2Measurement precision
If communication device reselection is performed, then position measurement accuracy is improved, but loss of time increases due to additional selection processes
Solution Approach 1:
The system performs distance measurements at multiple frequencies in advance to obtain phase characteristics before final position calculation. This preliminary action allows the system to calculate reliability information ahead of time, so that when position measurement is needed, the decision about device reselection can be made quickly based on pre-computed reliability data rather than performing additional measurements.
3Reliability
If alternative distance measurement methods are used, then reliability is improved, but measurement precision deteriorates
Solution Approach 1:
The system is designed to support multiple distance measurement methods (phase-based method and other methods) and can selectively switch between them. This multi-functionality allows the system to use the phase-based method when it provides high precision and reliability, and switch to alternative methods when reliability is insufficient, thereby achieving both high precision and high reliability through method diversity.
Data Source
AI summary
Improvements in the accuracy of position measurement based on a result of distance measurement using a phase-based method or distance measurement using a communication device are disclosed. In one example, an information processing device includes determination processing that determines, based on reliability information on distance measurement or position measurement obtained by performing communication processing for distance measurement using a phase-based method with a selected communication device, whether or not reselection of a communication device to be used for position measurement is required or whether or not to perform distance measurement using a method other than the phase-based method.