Author(s)

Yuping Shi¹, Qinwei Li¹, Hang Wu², Ming Yu^2*

¹Tianjin Key Laboratory for Advanced Signal Processing, School of Electronic Information and Automation, Civil Aviation University of China, Tianjin, China.
²Systems Engineering Institute, Academy of Military Science, People’s Liberation Army, Tianjin, China.

The frequency-modulated continuous wave (FMCW) radar, known for its high range resolution, has garnered significant attention in the field of non-contact vital sign monitoring. However, accurately locating multiple targets and separating their vital sign signals remains a challenging research topic. This paper proposes a scene-differentiated method for multi-target localization and vital sign monitoring. The approach identifies the relative positions of multiple targets using Range FFT and determines the directions of targets via the multiple signal classification (MUSIC) algorithm. Phase signals within the range bins corresponding to the targets are separated using bandpass filtering. If multiple targets reside in the same range bin, the variational mode decomposition (VMD) algorithm is employed to decompose their breathing or heartbeat signals. Experimental results demonstrate that the proposed method accurately localizes targets. When multiple targets occupy the same range bin, the mean absolute error (MAE) for respiratory signals is 3 bpm, and the MAE for heartbeat signals is 5 bpm.

Frequency-Modulated Continuous Wave (FMCW) Radar, Multi-Target, Multiple Signal Classification (MUSIC), Variational Mode Decomposition (VMD)

Shi, Y. , Li, Q. , Wu, H. and Yu, M. (2024) Radar-Based Multi-Target Localization and Vital Sign Monitoring. Journal of Computer and Communications, 12, 263-278. doi: 10.4236/jcc.2024.1211018.