Non-contact cardiopulmonary monitoring algorithm for a 24 GHz Doppler radar

The paper presents the particularities of using a Doppler radar in the 24 GHz band for non-contact cardiopulmonary monitoring. To separate heart beat from respiration we looked for a pattern in time-frequency domain instead of trying to extract directly the distance from phase observation in the baseband signal. By selecting the proper components from the Gabor transform prior expansion we obtained good accuracy for heart beat and respiration rates. Also, with minor correction in frequency, the algorithm leads to usable heartbeat waveform, opening new doors for further information extraction.