FMCW Radar Identity Tags for Group Vital-Sign Detection
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Solution Overview
Problem
Conventional continuous wave radar systems face difficulties in accurately detecting vital sign information of a designated test subject amidst interference from neighboring individuals or objects, particularly in group settings.
Innovation Solution
A frequency modulated continuous wave radar system that activates a tag reflector on a specific identity tag to emit an identity frequency, allowing for the detection of vital sign information by distinguishing reflection signals from the tag and the test subject using a chirp signal and intermediate frequency processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional continuous wave radar is used to detect vital sign information, then remote measurement capability is achieved, but measurement precision deteriorates due to interference from neighboring people or objects
Solution Approach 1:
An identity tag with a tag reflector is introduced as an intermediary between the radar system and the test subject. The tag reflector modulates the reflection signal with an identity frequency, enabling the radar to distinguish signals from different subjects. This intermediary resolves the interference problem by providing a unique identifier for each target without requiring changes to the radar's core detection mechanism.
Solution Approach 2:
The reflection signal is modulated with an identity frequency parameter through the tag reflector. By adding this frequency parameter to the reflection signal, the system can differentiate between multiple test subjects and filter out interference from neighboring objects. The identity frequency serves as a distinguishing parameter that enhances measurement precision in group settings.
2Productivity
If radar signals are transmitted to multiple test subjects simultaneously, then remote measurement capability is maintained, but measurement precision deteriorates due to inability to distinguish designated subject
Solution Approach 1:
The identity tag acts as a mediator that links the radar system to a specific test subject within a group. Each tag carries a unique identity frequency that allows the radar to identify and isolate the reflection signal from the designated subject even when multiple subjects are present. This enables both group detection capability and accurate subject identification.
Solution Approach 2:
Each test subject is equipped with a local identity tag that provides unique identification. This local quality (identity frequency) is assigned to each subject, allowing the radar system to differentiate between individuals in the group. The local identifier enables precise targeting of a specific subject's vital sign information without interference from others.
3Device complexity
If no identity identification mechanism is used, then device complexity is reduced, but measurement precision deteriorates due to interference from neighboring objects
Solution Approach 1:
A relatively simple identity tag with tag reflector is introduced as a minimal intermediary component. This tag adds identity frequency modulation capability without significantly increasing overall system complexity. The tag serves as a lightweight solution that enables precise subject identification while maintaining ease of deployment and system simplicity.
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 precise identification of vital sign information, such as heartbeat and breathing, by differentiating reflection signals from the identity tag and the test subject, thereby improving measurement accuracy and reducing interference.
Implementation Method 1
a frequency modulated continuous wave radar system
Implementation Method 2
the reflection signal may be modulated by the movement of the body of the test subject
Implementation Method 3
turn on a tag reflector of a specific identity tag to have an identity frequency
Data Source
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AI summary
A frequency modulated continuous wave radar system includes at least one identity tag, respectively disposed next to at least one test subject; and a frequency modulated continuous wave radar identity recognition device, including an identity recognition control module, for controlling a test identity tag of the at least one identity tag to be turned on to generate a specific tag reflection signal corresponding to an identity frequency in response to a chirp signal; and a frequency modulated continuous wave radar, for transmitting the chirp signal and receiving at least one reflection signal of the at least one test subject and the specific tag reflection signal in response to the chirp signal, to calculate and determine that the specific tag reflection signal and a specific reflection signal of the at least one reflection signal are corresponding to an adjacent position information. The specific reflection signal is corresponding to test subject information.