A Concurrent Dual-Beam Phased-Array Doppler Radar Using MIMO Beamforming Techniques for Short-Range Vital-Signs Monitoring

2019 ◽  
Vol 67 (4) ◽  
pp. 2390-2404 ◽  
Author(s):  
Mehrdad Nosrati ◽  
Shahram Shahsavari ◽  
Sanghoon Lee ◽  
Hua Wang ◽  
Negar Tavassolian
Keyword(s):  
Short Range ◽  
Phased Array ◽  
Doppler Radar ◽  
Vital Signs ◽  
Vital Signs Monitoring ◽  
Dual Beam ◽  
Mimo Beamforming

scholarly journals Radar-Based Non-Contact Continuous Identity Authentication

2020 ◽  
Vol 12 (14) ◽  
pp. 2279 ◽  
Author(s):  
Shekh Md Mahmudul Islam ◽  
Olga Borić-Lubecke ◽  
Yao Zheng ◽  
Victor M. Lubecke
Keyword(s):  
Doppler Radar ◽  
Vital Signs ◽  
Identity Authentication ◽  
Future Research ◽  
Great Promise ◽  
Healthcare Applications ◽  
Privacy Concerns ◽  
Vital Signs Monitoring ◽  
Wide Range ◽  
Physiological Sensing

Non-contact vital signs monitoring using microwave Doppler radar has shown great promise in healthcare applications. Recently, this unobtrusive form of physiological sensing has also been gaining attention for its potential for continuous identity authentication, which can reduce the vulnerability of traditional one-pass validation authentication systems. Physiological Doppler radar is an attractive approach for continuous identity authentication as it requires neither contact nor line-of-sight and does not give rise to privacy concerns associated with video imaging. This paper presents a review of recent advances in radar-based identity authentication systems. It includes an evaluation of the applicability of different research efforts in authentication using respiratory patterns and heart-based dynamics. It also identifies aspects of future research required to address remaining challenges in applying unobtrusive respiration-based or heart-based identity authentication to practical systems. With the advancement of machine learning and artificial intelligence, radar-based continuous authentication can grow to serve a wide range of valuable functions in society.

scholarly journals Vital signs monitoring using pseudo-random noise coded Doppler radar with Delta–Sigma modulation

2020 ◽  
Vol 14 (11) ◽  
pp. 1778-1787
Author(s):  
Salah H. Abouzaid ◽  
Wael A. Ahmad ◽  
Thomas F. Eibert ◽  
Herman Jalli Ng
Keyword(s):  
Doppler Radar ◽  
Random Noise ◽  
Vital Signs ◽  
Vital Signs Monitoring ◽  
Delta Sigma ◽  
Delta Sigma Modulation

scholarly journals 24 GHz Flexible Antenna for Doppler Radar-Based Human Vital Signs Monitoring

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3737
Author(s):  
Nitin Kathuria ◽  
Boon-Chong Seet
Keyword(s):  
Antenna Array ◽  
Doppler Radar ◽  
Human Subjects ◽  
Vital Signs ◽  
New Class ◽  
Antenna Performance ◽  
Vital Signs Monitoring ◽  
Compact Size ◽  
Flexible Antenna ◽  
24 Ghz

Noncontact monitoring of human vital signs has been an emerging research topic in recent years. A key approach to this monitoring is the use of the Doppler radar concept which enables real-time vital signs detection, resulting in a new class of radar system known as bio-radar. The antennas are a key component of any bio-radar module and their designs should meet the common requirements of bio-radar applications such as high radiation directivity and mechanical flexibility. This paper presents the design of a four-element antenna array on a flexible liquid crystal polymer (LCP) substrate of 100 μm thickness and εr of 3.35. The designed antenna array can be used with a 24 GHz bio-radar for vital signs monitoring in a non-contact manner. It features a relatively compact size of 36.5 × 53 mm2 and measured gain of 5.81 dBi. The two vital signs: breathing rate (BR) and heart rate (HR) of two human subjects are detected with relatively good accuracy using the fabricated antenna array and radio frequency (RF) output power of −3 dBm from a distance of approximately 60 cm. The effect of bending on the antenna performance is also analyzed.

scholarly journals Short-Range Vital Signs Sensing Based on EEMD and CWT Using IR-UWB Radar

2016 ◽  
Author(s):  
Xikun Hu ◽  
Tian Jin
Keyword(s):  
Short Range ◽  
Doppler Radar ◽  
Vital Signs ◽  
Ensemble Empirical Mode Decomposition ◽  
The Body ◽  
Ultra Wideband ◽  
Detection Range ◽  
Wall Movement ◽  
Mode Decomposition ◽  
The Subject

The designed radar sensor realizes the healthcare monitoring capable of short-range to detect the chest-wall movement of the subject caused by cardiopulmonary activities, and wirelessly estimating the distance from the sensor to the subject without any devices being attached to the body. Ensemble empirical mode decomposition (EEMD) based denoise method and 1-D continuous-wavelet transform (CWT) are applied for improving on the detection SNR so that accurate respiration rate and heartbeat rate can be acquired in time domain or frequency domain with further distance. No choosing the conventional Doppler radar only able to capture the Doppler signatures due to the lack of bandwidth information as noncontact sensor, we take full advantages of ultra-wideband (UWB) impulse radar to make it low power consumed and portable conveniently, with flexible detection range and preferable accuracy. This noncontact healthcare sensor system addressed proves the commercial feasibility and vast availability of using compact impulse radar for emerging biomedical applications. Compared with traditional contact measurement devices, experimental results utilizing the 2.3 GHz bandwidth transceiver, demonstrate 100% similar results.

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