Collimated Beam FMCW Radar for Vital Sign Patient Monitoring

Abstract

Patient monitoring of vital signals such as breathing rhythm and heart beat rate can be done remotely by the use of a radar system. This approach is advantageous since it does not require any contact with the patient. Obviously contactless monitoring results in a more comfortable situation for the patient, and in occasions it is almost mandatory as in the case of heavy burnt or newborn patients. Moreover, additional information such movement patterns are also available. A 120 GHz FMCW radar is described with special focus on the design, construction and testing of a specific reflector antenna for the system. The system is based on a commercial radar chipset that includes its own antennas. The challenge has been to design the optimum reflector and to build it and test it in a cost effective way. The reflector has been 3D printed and a near-field testing technique has been implemented to assess its performance. The results show that the system is able to measure the vital signs at distances beyond one meter.

Non-Contact Monitoring and Classification of Breathing Pattern for the Supervision of People Infected by COVID-19

“…Several studies have been conducted to detect and monitor human body conditions without physical touch, such as using CT scan, X-ray, camera, thermal camera, photoplethysmography technology [ 39 ], ultrasound technology, Wi-Fi [ 40 , 41 , 42 ], radar [ 43 , 44 , 45 , 46 , 47 , 48 , 49 ], thermography, etc. [ 50 , 51 ].…”

“…The FMCW radar can measure small movements as the signal is modulated. The respiration rate detector with FMCW performs the measurement based on the variation of the phases due to the chest displacement [ 47 , 48 , 49 ]. Initially, frequency analysis was applied to estimate the distance between the subject and the FMCW radar.…”

“…In a frequency analysis-based method, the breathing rate is estimated by detecting the peaks due to respiration over a spectrum [ 46 ]. The studies on estimating the breathing rate using radar have been investigated extensively with Doppler radar [ 21 , 43 , 45 , 46 ] and FMCW radar [ 47 , 48 , 49 ]. Previous studies on Doppler and FMCW radar provide an accurate estimation of respiration rate [ 43 , 44 , 45 , 46 , 47 , 48 , 49 ].…”

Noncontact Measurement of Autonomic Nervous System Activities Based on Heart Rate Variability Using Ultra-Wideband Array Radar

“…An operating frequency band is one of the most important parameters in radar-based heartbeat monitoring. For example, many recent studies use low-frequency CW radar at 2.4-2.5 GHz [21], [28], [32] [44], and 122 GHz [45].…”

Non-Contact Detection of Vital Signs Based on Improved Adaptive EEMD Algorithm (July 2022)

“…Vital signs mainly include heart rate, respiratory rate. It can be used to assist doctors in treatment, daily family health monitoring, morbid respiratory pattern monitoring and sleep quality evaluation [1][2][3]. It is not easily affected by temperature, humidity, working environment and other factors, which not only provides a non-invasive and convenient means of detecting vital signs, but also makes special scene applications possible.…”