Research on a Bioradar Based on the Analog Correlator

This paper presents a 5.75 GHz high-resolution continuous wave Doppler bioradar system based on the analog correlator. It is used to detect the breathing and heartbeat signals of a stationary human body. To reduce the power consumption of the system, the quadrature demodulation receiver is replaced by the analog correlator to generate the quadrature baseband signal. A radio frequency leakage cancellation module based on the six-port network is used at the front end to improve the detection sensitivity and the Tx-Rx isolation. The results show that the bioradar can accurately measure the heartbeat and respiratory rates at a distance of 1.5 meters.