RF Vital Sign Detection via Tagged Harmonic Signals
Solution Overview
Problem
Conventional non-contact vital-sign detecting systems face challenges in accurately identifying individual subjects due to signal interference and misidentification, especially when multiple subjects are close to each other, leading to decreased measurement accuracy and increased costs for multi-subject monitoring.
Innovation Solution
The system employs RF tags with unique frequencies on each subject, generating harmonic signals that are modulated by body motion, allowing an RF radar to differentiate subjects based on phase changes in reflected signals, enhancing identification and accuracy while using a frequency-adjustable transmitter and demodulator to process vital sign data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional non-contact vital-sign detecting systems are used to monitor multiple subjects, then monitoring capability is improved, but signal interference increases and measurement accuracy decreases
Solution Approach 1:
The patent divides the monitoring system into multiple independent detection channels, each assigned to a specific subject. By segmenting the monitoring process and using individual identification codes for each subject, the system can process multiple subjects simultaneously without signal interference, thereby maintaining measurement accuracy while improving monitoring capability.
Solution Approach 2:
The patent introduces an identification code as an intermediary element that mediates between multiple subjects and the detection system. Each subject is assigned a unique identification code that modulates their vital sign signals, allowing the system to distinguish and separately process signals from different subjects, thus eliminating interference while enabling multi-subject monitoring.
2Device complexity
If conventional non-contact vital-sign detecting systems are used, then system cost is reduced, but subject identification accuracy deteriorates and misidentification occurs
Solution Approach 1:
The patent changes the identification parameter from complex visual or physical characteristics to simple unique identification codes. By encoding subject identity through modulation codes rather than relying on complex recognition algorithms, the system achieves accurate subject identification at low cost, avoiding misidentification while maintaining simplicity.
3Productivity
If multiple subjects are monitored simultaneously, then monitoring efficiency is improved, but signal interference increases and individual subject detection becomes difficult
Solution Approach 1:
The patent segments the combined signal from multiple subjects into individual subject signals by using unique identification codes for each subject. This segmentation allows the system to maintain clear, interference-free signals for each subject while monitoring multiple subjects simultaneously, thus preserving signal clarity while improving monitoring efficiency.
Solution Approach 2:
The identification code acts as an intermediary that tags and distinguishes signals from different subjects. By embedding these codes in the vital sign signals, the system can efficiently process multiple subjects simultaneously while maintaining complete signal clarity and preventing information loss through interference.
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
This approach improves subject identification and measurement accuracy by eliminating interference, enabling simultaneous monitoring of multiple subjects with reduced costs and increased precision in vital sign detection.
Implementation Method 1
A measurement signal may be generated as the sensing signal modulated by the motion
Implementation Method 2
The tags 12 may generate incident harmonic (RF) signals respectively according to the RF signals with (different) predetermined frequencies
Data Source
Figure 1~2
Figure 3A
Figure 3B
AI summary
A vital-sign detecting system includes radio-frequency (RF) tags disposed on detected subjects respectively, the RF tags respectively generating incident RF signals with different predetermined frequencies, and the incident RF signal projecting on a corresponding detected subject to generate a corresponding reflected RF signal; and at least one RF radar that demodulates the reflected RF signal to obtain vital sign of the corresponding detected subject, and identifies the detected subject according to associated frequency of the reflected RF signal.