A novel non-contact vital sign detection system based on phase-coded pulse radar

This paper proposes a new sensitive microwave non-contact vital sign detection system based on phase-coded pulse radar. In order to improve the accuracy of the detection, short time autocorrelation and Golay code is introduced in the new system to increase the SNR of physiological signals. Simulation results show that the dc offset and flick noise, which are dominant factors in the conventional continuous-wave radar, are removed through the autocorrelation process while maintaining the dc component of the signal. Moreover, by adopting arctangent demodulation, the null point problem in the conventional radar is solved. With the ability of detecting signal in the noise, a robust sensing can be obtained and the system detection range will dramatically increase.