Experimental Design of Vital Sign Detection Based on FMCW Millimeter Wave Radar
A teaching experiment for human vital sign detection is designed by using the frequency modulated continuous wave(FMCW)millimeter wave radar.Firstly,the echo data of multiple human targets are collected by using the millimeter wave FMCW radar.Subsequently,the fast time Fourier transform(FFT)and Capon algorithm are employed to generate the range angle map.Then,the linearly constrained minimum variance(LCMV)criterion is utilized for digital beamforming to extract the slow time signal corresponding to each human target,and the modified differentiate and cross-multiply(MDACM)algorithm is used for phase signal extraction.Finally,the differential enhancement(DE)processing and bandpass filtering are combined to estimate the respiration and heartbeat signal frequencies.This paper provides the detailed description of the experimental principle and process for human vital sign detection,which is helpful for students to understand the basic working principle and signal processing method of radar system.The designed teaching experiment can improve the teaching effect of radar principle course.
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