Non-Contact Arterial Pulse Wave Measurement in a Two-Subject Scenario Using Millimeter-Wave Radar

Noncontact radar-based arterial pulse wave measurement in multisubject scenarios with multiple people remains a critical challenge because multiple echoes are received from various body parts of multiple subjects. This letter explores the feasibility of using a 79-GHz millimeter-wave radar integrated with independent component analysis with the joint approximation diagonalization of eigenmatrices for determining pulse transit time in two-subject concurrent measurements. Experimental results in three pairs of subjects demonstrated that the proposed approach can isolate the heart rate of two subjects with an accuracy of 89.66% and measure the pulse transit time with an accuracy of 79.22% compared to a reference laser sensor. The preliminary results indicate the possibility of noncontact radar monitoring of blood pressure in an environment with a high chance of the presence of multiple subjects in the radar field of view.