Living Body Estimation via Antenna Transfer Function Variation
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Solution Overview
Problem
Existing techniques using wireless signals cannot effectively detect the presence or number of living bodies in a target space, as they are not capable of distinguishing between living bodies and other objects.
Innovation Solution
An estimation method utilizing a transmission unit with at least one transmission antenna element and a reception unit with multiple reception antenna elements, calculating complex transfer functions, extracting variation components caused by living bodies, and estimating the number of living bodies based on eigenvalues of a correlation matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing wireless signal detection techniques are used, then the detection process is simple, but the ability to distinguish living bodies from other objects is poor
Solution Approach 1:
The patent extracts the variation component caused by living bodies from the complex transfer functions. By separating the living body-related variations from other signal components, the system achieves precise detection of living bodies while maintaining manageable processing complexity through targeted extraction rather than complete signal analysis
Solution Approach 2:
The patent applies different processing methods to different components of the signal. The variation component corresponding to living bodies is extracted and processed separately using correlation matrix and eigenvalue analysis, while other components are handled differently, allowing precise local detection of living bodies without requiring complex processing of the entire signal
2Measurement precision
If the number of antenna elements is increased, then the detection range and accuracy are improved, but the device complexity increases
Solution Approach 1:
The patent makes the reception antenna elements serve multiple functions: they receive wireless signals, extract variation components, and contribute to correlation matrix calculations. By enabling the same hardware components to perform multiple functions in the signal processing chain, the system achieves high detection accuracy without proportionally increasing device complexity
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
Enables accurate estimation of the number of living bodies present in a target space using wireless signals, allowing for presence/absence detection and location tracking, enhancing detection accuracy and range.
Implementation Method 1
a transmission unit including at least one transmission antenna element and a reception unit including N reception antenna elements
Implementation Method 2
reception signals respectively received by the N reception antenna elements
Data Source
AI summary
An estimation method is provided which includes: calculating a plurality of complex transfer functions, based on reception signals respectively received by N reception antenna elements during a predetermined period, the complex transfer functions each representing propagation characteristics between a transmission antenna element and the N reception antenna elements; extracting a variation component corresponding to each of the N reception antenna elements, from the calculated complex transfer functions, the variation component being caused by a living body; calculating a correlation matrix based on the variation component corresponding to each of the N reception antenna elements; calculating eigenvalues of the correlation matrix calculated in the calculating of the correlation matrix; and estimating the number of living bodies in a predetermined method, using the eigenvalues calculated in the calculating of the eigenvalues.