Doppler Cardiogram Detection in Clinical Environment

In this study, a K-band Doppler radar sensor with adaptive digital dc-tuning function was designed to measure the Doppler Cardiogram (DCG) in clinical environment. Aiming to suit the normal surgery or hospitalization scenarios, a novel filter method was proposed to extract the DCG signal from the original demodulated signals with no need for subject holding his/her breath. The digital dc tuning function embedded in radar ensures less linear distortion with simple hardware implementation. Then, clinical experiments and evaluations are carried out in the operation theatre. Experimental results show that the DCG obtained in this work is aligned well with ECG waveform. The P-R intervals and R-R intervals estimation results reached 99% and 92.8% accuracy, which indicates the proposed method is suitable for clinical application.