FMCW Radar Echo Decoding for Tag-Free Identity Recognition
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Solution Overview
Problem
Current radar systems require additional identity recognition devices, such as e-tags or RFID tags, which incur costs and cause discomfort, making them inconvenient for subjects.
Innovation Solution
A frequency modulated continuous wave (FMCW) radar system with an identity recognition function that demodulates radar echoes to obtain identity codes without the need for additional devices, using a processing module to apply FFT processes and calculate identity codes based on delay times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional identity recognition devices (e-tag or RFID tag) are worn by the subject, then identity recognition capability is improved, but device complexity and subject discomfort increase
Solution Approach 1:
The patent merges the identity recognition function with the existing radar sensor by encoding identity information into the radar echo signal itself. The processing module decodes this embedded identity code from the radar echo, eliminating the need for separate identity recognition devices while integrating multiple functions (identity recognition, sensing, and vital sign detection) into a single radar system.
Solution Approach 2:
The radar sensor is designed to perform multiple functions simultaneously: it detects identity information through encoded radar echoes, captures sensing information about the subject, and monitors vital signs. This multi-functional approach allows one device to replace what would traditionally require multiple separate devices.
2Adaptability or versatility
If additional identity recognition devices are worn by the subject, then identity recognition capability is improved, but ease of operation deteriorates due to inconvenience and discomfort
Solution Approach 1:
The subject's own radar echo serves as the carrier for identity information. The identity code is embedded within the radar reflection from the subject's body, allowing the system to automatically extract identity information without requiring the subject to wear or interact with additional devices. The subject essentially 'services' their own identification through their natural radar reflection.
3Adaptability or versatility
If additional identity recognition devices are used, then identity recognition capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts the identity recognition function from separate physical devices and embeds it within the radar signal processing system. By taking out the identity tag hardware and replacing it with signal encoding/decoding capabilities in the radar system, the solution eliminates the need to manufacture and supply additional identity recognition devices to each subject.
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 identity recognition using existing radar systems, eliminating the need for additional devices and allowing simultaneous detection of sensing and vital sign information.
Implementation Method 1
a frequency modulated continuous wave (FMCW) radar includes a signal generator configured to generate a linear frequency modulated (LFM) radar signal SF, a transmission module coupled to the signal generator SF and configured to transmit the radar signal SF, and a receiving module coupled to the transmission module and configured to receive a radar echo SR corresponding to the radar signal SF
Implementation Method 2
receive a radar echo SR corresponding to the radar signal SF
Data Source
AI summary
A frequency modulated continuous wave (FMCW) radar with an identity recognition function and a method for decoding an identity code from a radar echo are provided. After digital signals corresponding to the radar echo detected by the FMCW radar are obtained, a range fast Fourier transform (FFT) process is applied to the digital signals to obtain a plurality of peak frequencies. Subsequently, the peak frequencies are converted into a plurality of delay times based on a linear frequency-modulated (LFM) slope. Finally, an identity code is calculated based on the delay times.