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http://dx.doi.org/10.5515/KJKIEES.2014.25.4.418

Doppler Radar System for Long Range Detection of Respiration and Heart Rate  

Lee, Jee-Hoon (Department of Electrical Engineering, Korea Advanced Institute of Science and Technology)
Kim, Ki-Beom (Department of Electrical Engineering, Korea Advanced Institute of Science and Technology)
Park, Seong-Ook (Department of Electrical Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.25, no.4, 2014 , pp. 418-425 More about this Journal
Abstract
This paper presents a Ku-Band Doppler Radar System to measure respiration and heart rate. It was measured by using simultaneous radar and ECG(Electrocardiogram). Arctangent demodulation without dc offset compensation can be applied to transmitted I/Q(In-phase & Quadrature-phase) signal in order to improve the RMSE(Root Mean Square Error) about 50 %. The power leaked to receiving antenna from the transmitting antenna is always generated because of continuously opening the transceiver of CW(Continuous Wave) Doppler radar. As the output power increase, leakage power has an effect on the SNR(Signal-to-Noise Ratio) of the system. Therefore, in this paper, leakage cancellation technique that adds the signal having the opposite phase of the leakage power to the leakage power was implemented in order to minimize the decline of receiver sensitivity. By applying the leakage cancellation techniques described above, it is possible to measure the heart rate and respiration of the human at a distance of up to 35 m. the heart rate of the measured data at a distance of 35 m accords with the heart rate extracted from the ECG data.
Keywords
Heart Rate; Doppler Radar; Leakage Cancellation; Arctangent Demodulation;
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