Monitoring Displacement by a Quadrature Self-Injection-Locked Radar With Measurement- and Differential-Based Offset Calibration Methods

Wang, Fu-Kang; Juan, Pin-Hsun; Su, Sheng-Chao; Tang, Mu-Cyun; Horng, Tzyy‐Sheng

doi:10.1109/jsen.2018.2884729

Cited by 24 publications

(6 citation statements)

References 18 publications

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“…There have been several engineering research articles of the device presented by the inventors. The technologies of self-injection-locked radar and infrared light are used in non-contact detection of vital signs, included body temperature, heart rate, respiratory rate and body positioning [3][4][5][6][7]. As more information is collected, the software of this device is able to conduct an autocalibration to extract the displacement information, which enhances the measurement accuracy of body temperature, heart rate and respiratory rate.…”

Section: Methodsmentioning

confidence: 99%

A Novel Non-contact Self-Injection-Locked Radar for Vital Sign Sensing and Body Movement Monitoring in COVID-19 Isolation Ward

et al. 2020

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Background The outbreak of Coronavirus disease (COVID-19) pandemic has become the most serious global health issue. Isolation policy in hospitals is one of the most crucial protocols to prevent nosocomial infection of COVID-19. It is important to monitor and assess the physical conditions of the patients in isolation. Methods Our institution has installed the novel non-contact wireless sensor for vital sign sensing and body movement monitoring for patients in COVID-19 isolation ward. Results We have collected and compared data between the radar record with the nurse's handover record of two patients, one recorded for 13 days and the other recorded for 5 days. The P value by Fisher's exact test were 0.139 (temperature, P > 0.05) and 0.292 (heart beat rate, P > 0.05) respectively. Conclusions This is the first report about the application experience of this equipment. Therefore we attempted to share the experience and try to apply this equipment in COVID-19 patients in future to offer the more reliable and safe policy.

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Section: Methodsmentioning

confidence: 99%

A Novel Non-contact Self-Injection-Locked Radar for Vital Sign Sensing and Body Movement Monitoring in COVID-19 Isolation Ward

et al. 2020

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“…Noninvasive methods for vital signs monitoring are mostly based on radio frequency (RF) technologies, as they do not require measuring devices to be attached to the users, e.g., [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Devices used to perform RF-based vital signs detection can be briefly classified as specialized radars [2][3][4][5][6][7][8] or WiFi devices [9][10][11][12]. For example, [2][3][4][5] implemented a Doppler radar at 2.4 GHz to capture a person's breathing and heartbeat movements with high accuracy in complex indoor environments. Studies in [6][7][8] utilized frequency-modulated continuous-wave (FMCW) radars to monitor the breathing and heartbeat rates of multiple persons by detecting chest fluctuations from breathing and heartbeats.…”

Section: Introductionmentioning

confidence: 99%

“…The SIL radar is inexpensive, in which the voltage-controlled oscillator (VCO) and low noise amplifier (LNA) are the only active component, and others are passive coaxial components. Extensive experiments in [3][4][5] have demonstrated its promises in enabling high-sensitivity single-object vital signs detection even for tiny heartbeats. Therefore, a relevant question would be to answer whether the low-cost SIL radar can be applied to provide full-night vital signs monitoring.…”

Section: Introductionmentioning

confidence: 99%

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Signal Separation and Tracking Algorithm for Multi-Person Vital Signs by Using Doppler Radar

Chian

Wen

Wang

et al. 2020

IEEE Trans. Biomed. Circuits Syst.

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Noninvasive monitoring is an important internet-of-things (IoT) application, which is made possible by the advances in radio-frequency (RF) based detection technologies. Existing techniques however rely on the use of antenna array, and their size greatly limits the applicability of in-home monitoring. Another deficiency is that the technology so far is not applicable to multi-person scenarios. In this paper, we propose our system termed 'DeepMining' which is a single-antenna Doppler radar system that can simultaneously track the breathing rates and heartbeats of multiple persons with high accuracy. DeepMining uses a number of signal observations over a period of time as input and returns the trajectory of the breathing and heartbeat rates of each person. The extraction is based on frequency separation algorithms using successive signal cancellation. The proposed system is implemented using the selfinjection locking (SIL) radar architecture and tested in a series of experiments, showing accuracies of 95% and 90% for two and three subjects, respectively, even for closely located persons.

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“…In addition to the video monitoring equipment, we introduce a continuous contact-free monitoring system in the isolation ward, which monitors the heart rate, respiration, and postural status using a single-frequency continuouswave radar and monitors the body temperature using an infrared thermal sensor. 5 The nursing staff are able to get real-time information about the vital signs and conditions of the patients, so we are able to limit the times that the nursing staff enter the rooms to about 3 times daily. Some patients develop respiratory failure and require mechanical ventilation.…”

mentioning

confidence: 99%

Deployment of information technology to facilitate patient care in the isolation ward during COVID-19 pandemic

Tsai

Pan

et al. 2020

Journal of the American Medical Informatics Association

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Monitoring Displacement by a Quadrature Self-Injection-Locked Radar With Measurement- and Differential-Based Offset Calibration Methods

Cited by 24 publications

References 18 publications

A Novel Non-contact Self-Injection-Locked Radar for Vital Sign Sensing and Body Movement Monitoring in COVID-19 Isolation Ward

A Novel Non-contact Self-Injection-Locked Radar for Vital Sign Sensing and Body Movement Monitoring in COVID-19 Isolation Ward

Signal Separation and Tracking Algorithm for Multi-Person Vital Signs by Using Doppler Radar

Deployment of information technology to facilitate patient care in the isolation ward during COVID-19 pandemic

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