Millimeter-Wave Radar Height Measurement with Selective Wake-Up
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Solution Overview
Problem
Traditional height measurement methods require physical contact or are susceptible to environmental interference, leading to inconvenience, lower accuracy, and increased energy consumption.
Innovation Solution
A height measurement device utilizing a millimeter-wave radar module, wake-up module, and main controller, which activates the radar module only when needed, employing frequency-modulated continuous wave ranging to measure human height with high precision and reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional contact measurement methods are used, then measurement can be performed with simple equipment, but the process is time-consuming and inconvenient
Solution Approach 1:
The patent replaces traditional mechanical contact measurement methods with millimeter-wave radar technology. The radar module emits electromagnetic waves that reflect off the human body to calculate distance, eliminating the need for physical contact with measurement tools while achieving faster, non-contact height measurement.
Solution Approach 2:
The system uses periodic wake-up signals to activate the millimeter-wave radar module only when measurement is needed. The wake-up module detects human presence and triggers the radar module periodically rather than keeping it continuously active, reducing energy consumption while maintaining measurement readiness.
2Ease of operation
If ultrasonic distance measurement devices are used, then non-contact measurement is achieved, but the measurements are easily affected by environmental factors such as temperature and propagation medium
Solution Approach 1:
The patent changes the operating frequency parameter from ultrasonic range (20-60 kHz) to millimeter-wave range (30-300 GHz). This frequency change makes the measurement less sensitive to environmental factors like temperature and propagation medium, as millimeter waves are less affected by these conditions compared to ultrasonic waves.
Solution Approach 2:
The patent substitutes ultrasonic acoustic wave measurement with millimeter-wave electromagnetic radiation measurement. This substitution eliminates the dependence on acoustic propagation characteristics that are sensitive to temperature and medium conditions, providing more stable and reliable measurements in varying environments.
3Productivity
If the millimeter-wave radar module operates continuously, then height measurement is always available, but energy consumption increases
Solution Approach 1:
The system implements periodic operation by using a wake-up module that detects human presence and activates the millimeter-wave radar module only when needed. The radar module switches between working state and standby state periodically, maintaining measurement availability while significantly reducing energy consumption during idle periods.
Solution Approach 2:
The system dynamically adjusts the operational state of the millimeter-wave radar module based on real-time detection needs. The wake-up module continuously monitors for human presence and dynamically transitions the radar module between active and standby states, optimizing the balance between measurement availability and energy consumption.
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 method achieves non-contact, high-precision height measurement while minimizing energy usage by activating the millimeter-wave radar module selectively, offering a user-friendly solution for medical, commercial, and household applications.
Implementation Method 1
a height measurement device based on a millimeter-wave radar
Implementation Method 2
The echo signal is formed by the reflected back transmission signal after it encounters a human head
Implementation Method 3
In a case of the infrared pair module, the infrared pair module sends an electrical signal to the main controller when detecting a human in a defined region
Data Source
AI summary
A height measurement device and a height measurement method based on a millimeter-wave radar are provided. The height measurement device comprises a millimeter-wave radar module, a main controller, and a wake-up module. The wake-up module and the millimeter-wave radar module are connected to the main controller, respectively. The wake-up module activates the millimeter-wave radar module through the main controller. The millimeter-wave radar module sends a transmission signal and receives an echo signal, and obtains an intermediate-frequency signal based on the transmission signal and the echo signal. The echo signal is formed by the reflected back transmission signal after it encounters human head. The main controller applies continuous millimeter waves to sweep across the highest point of the human head and obtain height data based on the intermediate-frequency signal. When height measurement is needed, the wake-up module activates the millimeter-wave radar module, achieving non-contact, high-precision height measurement and reducing energy consumption.