A Novel Vital Sign Sensing Algorithm for Multiple People Detection Based on FMCW Radar

This paper proposes an adaptive digital beamforming (ADBF) algorithm to realize non-contact multi-person vital sign detection using a frequency modulated continuous wave (FMCW) radar. The 77 GHz FMCW radar multiple input multiple output (MIMO) mode is used to collect the vital sign echo signal of multi-human targets. At the receiving antennas, the ADBF algorithm is used to suppress the direction of arrival (DOA) interference on the vital sign signals. Then it combines 3-dimensional fast Fourier transform (3D-FFT) rangeangle algorithm to achieve multi-person target separation. The experimental results show that the proposed method is effectively for non-contact multiple people vital sign detection.