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AWR1642: Question principle of heart rate measurement

Part Number: AWR1642

Hi team

TI RADAR (AWR1642 EV board) has a demonstration mode of heart rate measurement.

Please tell me the principle of measurement.

UWB is the principle of measuring the movement of the heart through human skin.

77GHz FMCW (TI RADAR) Please check how your heart rate is measured (based on demo mode).
(Eg, heartbeat of the skin, heart rate calculated by breathing measurement, etc.)

Thanks,

TM