研究目的
To develop a portable and low-cost 24GHz Doppler radar system for non-contact distant human vital sign monitoring, addressing the limitations of existing laboratory-based systems.
研究成果
The developed portable 24GHz Doppler radar successfully extracts human cardiopulmonary rates using time-frequency analysis, demonstrating practicality through low cost and small size. Future work will focus on advanced signal processing algorithms for improved accuracy.
研究不足
The system may be affected by interference from human body movements and other moving parts; performance is dependent on signal processing algorithms, and advanced algorithms for accurate measurement under movement are not fully addressed.
1：Experimental Design and Method Selection:
The system uses a homodyne radar architecture with a commercial 24GHz transceiver module to obtain analog quadrature signals, which are digitized and processed using time-frequency analysis algorithms for vital sign extraction.
2：Sample Selection and Data Sources:
A 34-year-old male subject seated 50 cm away from the radar was used for validation, with data compared to a finger pulse sensor.
3：List of Experimental Equipment and Materials:
Includes the K-LC2 24GHz transceiver module, Silicon Labs C8051F350 microcontroller, WIFI module, printed circuit board, and signal processing software (NI LabVIEW or MATLAB).
4：Experimental Procedures and Operational Workflow:
The radar transmits a 24GHz continuous wave, receives reflected signals modulated by chest movements, filters and amplifies baseband signals, digitizes them with ADC, transmits via WIFI to a computer for processing using STFT and IF estimation.
5：Data Analysis Methods:
Time-frequency analysis using short-time Fourier transform (STFT) to extract instantaneous frequency, followed by spectral estimation to determine respiration and heartbeat rates.
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