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A noncontact measurement of the heart rate of a specific person using an X -band radar system with a four-element antenna array is presented. The system comprises a 2-D planar wide-beam antenna array with a four-channel network analyzer. The direction of arrival is estimated using the Capon method, and the directionally constrained minimization-of-power algorithm is then applied to the received signals. Signals from the four channels are adaptively combined to enhance the accuracy in estimating the instantaneous heart rate in a multi-person scenario. Measurement results indicate that the proposed system with the adaptive array processing technique is effective for the noncontact measurement of the heart rate of a specific person when there is more than one person in the scene.

ieee journal on emerging and selected topics in circuits and systems

Noncontact Measurement of the Instantaneous Heart Rate in a Multi-Person Scenario Using <inline-formula> <tex-math notation="LaTeX">${X}$ </tex-math></inline-formula>-Band Array Radar and Adaptive Array Processing

Noncontact Measurement of the Instantaneous Heart Rate in a Multi-Person Scenario Using ${X}$ -Band Array Radar and Adaptive Array Processing