Microwave FMCW Doppler radar implementation for in-house pervasive health care system

Abstract

In recent years, the research in the area of ubiquitous healthcare has intensified. There are many technological advances regarding the development of unobtrusive sensors for cardiac and respiratory activity, but the current scenario is still far away from an everyday life fulfilled with ubiquitous healthcare systems. In this paper, it is described the usage of 24GHz microwave FMCW (frequency modulated continuous wave) Doppler radar (MDR) as one of the main components of a pervasive biomedical system that is part of an assistive environment for the people with less mobility or people with long term health condition. As parts of the present work, in this paper are mentioned the design and implementation of an assistive environment based on a MDR sensor, an experimental study concerning the microwave Doppler radar characteristics and remote sensing of heart rate and breath rate, based on acquisition and processing of the signals delivered by the used radar. Keywords-ubiquitous healthcare system, unobtrusive sensors, microwave Doopler radarI.

Detection of Concealed Individuals Based on Their Vital Signs by Using a See-Through-Wall Imaging System With a Self-Injection-Locked Radar

“…In particular, the tones located below 465 Hz originate mainly from the sweep nonlinearity of the VCO. To remove the effects of sweep nonlinearity and stationary clutter, this work defines background subtracted spectrum as (24) With an emphasis on the spectral peak variations in relation to spectral subtraction noise, Fig. 9 shows the normalized fourth power of background subtracted spectra with respect to Fig.…”

“…However, an FMCW radar has difficulty in extracting tiny body movements, such as due to cardiopulmonary activity, from continuous range information, since the noise sideband of a transmitter often swamps the target Doppler signals [22]. On the other hand, some FMCW approaches detect the vital sign signals by demodulating the low-frequency information from the FM carrier frequency [23], [24], but fail to provide the synchronous range information.…”

Remote sensing technologies for physiotherapy assessment

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Applying smartphone apps to drive greater patient engagement in personalized physiotherapy

“…The implemented smart walker presents four measurement channels expressed by motion, force, acceleration and displacement. The motion measuring channel is based on a microwave frequency continuous wave Doppler radar [25][26] characterized by 24GHz-24.250GHz working frequency. A Vtune voltage, characterized by ftune ≤150 kHz is applied to radar VCO-transceiver assuring accurate target motion detection.…”