Living Body Position Estimation Using Eigenvalue Credibility
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Solution Overview
Problem
Existing techniques for detecting the position of a living body using radio signals are inadequate, as they fail to estimate the position of a living body accurately and do not provide credibility assessment of measurement results, especially due to external noise and lack of credibility evaluation.
Innovation Solution
An estimation method utilizing a transmitter with at least one transmission antenna element and a receiver with multiple reception antenna elements, calculating complex transfer functions, extracting living body components, computing a correlation matrix, and estimating the credibility of the position or direction of a living body based on eigenvalues and living body count information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection techniques are used to detect the position of a device, then the position can be detected, but the technique cannot estimate the position of a living body accurately
Solution Approach 1:
The patent changes the parameters being measured from simple position detection to complex transfer function analysis. By calculating multiple complex transfer functions from reception signals and analyzing their eigenvalues, the system adapts the measurement parameters to suit living body detection while maintaining high precision.
Solution Approach 2:
The patent introduces complex transfer functions as an intermediary between the raw reception signals and the final position estimation. These transfer functions serve as a mediator that transforms the signals into a form suitable for accurate living body position estimation through eigenvalue analysis.
2Productivity
If instantaneous measurement is performed to obtain position data, then the measurement is quick, but external noise causes measurement errors and credibility cannot be evaluated
Solution Approach 1:
The patent implements feedback by calculating credibility values based on eigenvalue analysis and using this information to evaluate and potentially adjust the position estimation results. This feedback mechanism allows the system to assess measurement reliability and maintain accuracy even in noisy environments.
Solution Approach 2:
The patent performs preliminary eigenvalue analysis on the complex transfer functions before final position estimation. This preliminary action of analyzing the signal characteristics and calculating credibility metrics prepares the system to handle external noise and ensures reliable measurements are made.
3Ease of operation
If simple position detection is used, then the process is straightforward, but there is no way to evaluate the credibility of the measurement result
Solution Approach 1:
The patent segments the detection process into distinct stages: calculating complex transfer functions, performing eigenvalue decomposition, calculating credibility values, and finally estimating position. This segmentation maintains operational clarity while incorporating comprehensive credibility evaluation at each stage.
Data Source
AI summary
An estimation method according to the present disclosure includes: extracting, from a plurality of calculated complex transfer functions, living body components respectively corresponding to N reception antenna elements and affected by a living body; calculating a correlation matrix based on the extracted living body components respectively corresponding to the N reception antenna elements; computing one or more eigenvalues of the calculated correlation matrix; estimating a credibility of an estimation result of estimating the position or the direction of a living body in a target space, using the one or more computed eigenvalues and living body count information indicating a value indicating a total number of living bodies in the target space; and estimating the position or the direction of the living body via a predetermined method, based on the correlation matrix, according to the credibility of the estimation result.