FMCW Radar Integration for Vital Sign and Humidity Detection
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Solution Overview
Problem
Existing radar technologies used for detecting vital information, such as breathing and heartbeat, are unable to simultaneously detect humidity levels, particularly in applications involving patients, the elderly, and infants who wear diapers.
Innovation Solution
A frequency-modulated continuous wave (FMCW) radar device and method that transmits incident radar signals with multiple chirp signals, allowing for the simultaneous detection of vital information and humidity by demodulating reflected signals to obtain intermediate frequency signals, which are then processed to extract relevant information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a radar device is designed to detect only vital information (breathing and heartbeat), then the detection function for vital signs is achieved, but the ability to detect humidity is lost
Solution Approach 1:
The radar device is designed to perform multiple detection functions using a single system. By processing reflected radar signals through different demodulation methods (first demodulation for vital information, second demodulation for humidity), the device can simultaneously detect both vital signs and humidity levels, eliminating the need for separate detection devices.
2Reliability
If separate devices are used for detecting vital information and humidity, then each detection function is specialized, but device complexity and space requirements increase
Solution Approach 1:
The patent combines vital information detection and humidity detection into a single radar device. Both detection functions share common hardware components (transmitting unit, receiving unit, processing unit) and use the same reflected radar signals, reducing device complexity and space requirements while maintaining specialized detection capabilities through different signal processing methods.
3Device complexity
If multiple detection functions are integrated into one radar device, then device space and hardware costs are reduced, but signal processing complexity increases
Solution Approach 1:
The signal processing is divided into distinct segments: first demodulation processing for extracting vital information (breathing and heartbeat) from the reflected radar signal, and second demodulation processing for extracting humidity information. This segmentation allows complex multi-function detection to be achieved through manageable, specialized processing steps for each detection target.
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
The FMCW radar device effectively measures vital information and humidity simultaneously, reducing the need for additional hardware and saving device space and costs.
Implementation Method 1
transmitting an incident radar signal to a field, and receiving a reflected radar signal corresponding to the field
Implementation Method 2
frequency-modulated continuous wave (FMCW) radar device
Implementation Method 3
demodulating the reflected radar signal according to the incident radar signal to obtain a first intermediate frequency signal
Implementation Method 4
demodulating the reflected radar signal according to the frequency-multiplied incident radar signal to obtain a second intermediate frequency signal
Implementation Method 5
demodulating the reflected radar signal according to the frequency-multiplied incident radar signal
Implementation Method 6
processing the first intermediate frequency signal to obtain vital information of a to-be-measured object
Implementation Method 7
obtaining humidity information according to an energy peak time point of the second intermediate frequency signal
Data Source
AI summary
A method for detecting vital information and humidity by using a frequency-modulated continuous wave (FMCW) radar device is provided, including: transmitting an incident radar signal to a field, detects a reflected radar signal reflected by a to-be-measured object and a reflected radar signal reflected by a humidity sensor tag, so as to obtain vital information of the to-be-measured object and humidity information detected by the humidity sensor tag.