Microwave Doppler Radar Sensing System for Vital Sign Detection: From Evaluated Accuracy Models to the Intelligent System

The development of microwave radar vital sign sensing system brings many benefits to mankind. This system can be used to detect the location of living people buried under debris. Other important applications of microwave radar sensor are smart home, health care and defense. There are several main blocks in the radar sensor such as a transmitter, a receiver, a signal processing circuit and a display block. The transmitter propagates radio frequency signals toward the human and collects the reflected signals from the human chest. By analyzing transmitted and received signals, useful information like breathing rate, heartbeat, and people's location are taken. This work focuses on the studying mathematical model to evaluate the accuracy of radar vital sign sensing system when the operating frequency and distance change. Moreover, the integration between AI technique and radar sensor is also considered carefully in this study. The combination makes this system smarter, enables more applications and brings more benefits to users.