2.4 GHz bio‐radar system with improved performance by using phase‐locked loop

Myoung, Seong-Sik; Park, Jae Hyung; Yook, Jong Gwan; Jang, Byung Jun

doi:10.1002/mop.25366

Cited by 10 publications

(7 citation statements)

References 2 publications

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“…Therefore, alternative solutions for single antenna implementation can be explored. One possible solution is sharing the same radiating aperture using a CP antenna and using opposite polarizations for TX and RX functions [16,17,20,21]. For example, in [17], a single antenna with CP and operating at 24 GHz, was shared by TX and RX.…”

Section: Single Antenna For Tx/rxmentioning

confidence: 99%

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Different Antenna Designs for Non-Contact Vital Signs Measurement: A Review

et al. 2019

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Cardiopulmonary activity measured through contactless means is a hot topic within the research community. The Doppler radar is an approach often used to acquire vital signs in real time and to further estimate their rates, in a remote way and without requiring direct contact with subjects. Many solutions have been proposed in the literature, using different transceivers and operation modes. Nonetheless, all different strategies have a common goal: enhance the system efficiency, reduce the manufacturing cost, and minimize the overall size of the system. Antennas are a key component for these systems since they can influence the radar robustness directly. Therefore, antennas must be designed with care, facing several trade-offs to meet all the system requirements. In this sense, it is necessary to define the proper guidelines that need to be followed in the antenna design. In this manuscript, an extensive review on different antenna designs for non-contact vital signals measurements is presented. It is intended to point out and quantify which parameters are crucial for the optimal radar operation, for non-contact vital signs’ acquisition.

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Section: Single Antenna For Tx/rxmentioning

confidence: 99%

“…The same approach was used in [20], where a bio-radar system is presented with a phase-locked loop and uses a single antenna for TX and RX. In this work, the authors have developed a circular-polarized annular ring microstrip antenna, with RHCP at transmitting mode and LHCP at receiving mode.…”

Section: Single Antenna For Tx/rxmentioning

confidence: 99%

Different Antenna Designs for Non-Contact Vital Signs Measurement: A Review

et al. 2019

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“…The experimental data revealed that the presented system can detect human cardiopulmonary activity within a normal detection distance using optimal pulse bias conditions. Compared with the sensor using the PA , power consumption of this presented sensor can be further reduced and other performances are in acceptable ranges.…”

Section: Introductionmentioning

confidence: 98%

“…For long‐term remote sensing, low power dissipation for a wireless sensor is required to detect human cardiopulmonary activity without interference. The vital sign wireless sensor usually uses direct current (DC) bias to maintain information integrity, providing adequate accuracy. When a power amplifier (PA) is used to increase signal strength for improving sensitivity , the sensor will continuously consume large DC power.…”

Section: Introductionmentioning

confidence: 99%

Direct conversion Doppler radar vital sign detection system using power management technique

Lee

Lin

Chen

et al. 2014

Micro & Optical Tech Letters

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Furthermore, the tunable operation frequency range of the proposed impulse generator is experimentally studied. This impulse generator can work well at any input frequency around 1-15 MHz. Figure 4 displays the experimental results of the final output impulses at operation frequencies of 1, 5, 10, and 15 MHz. It can be recognized that the lower frequency, the slightly higher amplitude. This is attributed to the recovery time of the RC-circuit of the collector resistance and the output coupling capacitor. When frequency is higher the period is shorter so that the output coupling capacitor has shorter time for recovery. Consequently, the output amplitude is lower. Therefore, by adjusting the values of the collector resistance and the output coupling capacitor, we can broaden the working frequency range. In addition, the fabricated impulse generator was checked by HP 8593E RF spectrum analyzer with generated high-order harmonic up to 10 GHz.With such output UWB short impulses, the impulse generator can be used for many practical applications in electronics and optics. By utilizing the fast leading edge characteristic of the generated short impulses for driving actively mode-locked fiber lasers, we may anticipate a possible generation of shorter optical pulses than reported in [6]. This issue is currently under investigation and will be reported elsewhere. CONCLUSIONIn this article, we have described a method for generating UWB picosecond impulses with fast fall-time based on the fast switchon characteristic of a broadband bipolar transistor and the edge compression characteristic of a NLTL comb generator. The experimental results showed that the generated short impulses had a pulse-width of about 725 ps, a fall-time of 180 ps, and a peak power of 1 W at 50 X. ABSTRACT: This article is the first to present a low power consumption direct conversion Doppler radar vital sign detection system using a power management technique to detect biomedical signals. The optimal pulse bias with simultaneous switching noise considered was designed to decrease power consumption of the sensor. A noncontact vital sign detection measurement using the optimal pulse bias was performed on a human subject. Based on experimental results, the presented simple and low power system can accurately detect human cardiopulmonary activity, including respiration and heartbeat. Calculated physiological signal amplitudes based on a spectral analysis validates the detection result from presented work. When compared with the sensor using a power amplifier, the proposed sensor can achieve low power dissipation for biomedical monitoring and green energy applications.

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“…We have also introduced a circular polarized antenna to reduce size and to allow use of a single antenna for bio-radar applications [12,13]. In the present paper, a MIMO bio-radar system is introduced that consists of two bio-radar system sharing identical VCO with a PLL and new concept of direction finding of human target based on phase difference between two receivers is presented.…”

Section: -1 System Configurationmentioning

confidence: 99%

Detection of Human Vital Signs and Estimation of Direction of Arrival Using Multiple Doppler Radars

An¹,

Jang

Yook

2010

Journal of electromagnetic engineering and science

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This paper presents a non-contact measurement method of vital signal by the use of multiple-input multiple-output (MIMO) bio-radar system, configured with two antennas that are separated by a certain distance. The direction of arrival (DOA) estimation algorithm for coherent sources was applied to detect vital signals coming from different spatial angles. The proposed MIMO bio-radar system was composed of two identical transceivers sharing single VCO with a PLL. In order to verify the performance of the system, the DOA estimation experiment was completed with respect to the human target at angles varying between -50° and 50° where the bio-radar system was placed at distances (corresponding to 50 cm and 95 cm) in front of a human target. The proposed MIMO bio-radar system can successfully find the direction of a human target. Ⅰ. IntroductionRecently, remote sensing techniques have been actively studied as a means of measuring vital signs. Among these techniques, the Doppler radar sensing of vital signs has received substantial attention due to its simple system architecture and non-contact detection capability [1,2]. Various Doppler radar architectures for sensing human vital signs have consequently been developed: a Doppler radar system based on board-level and chip-level design [3], a dual-antenna Doppler radar system compensated for background motion [4], a barrier penetration consisted of ultra-wide band (UWB), and a CW Doppler radar [5] are some examples. MIMO signal processing methods, such as blind source separation (BSS) and analytical constant modulus algorithm (ACMA), have attracted a great deal of interest for non-contact vital sign detection [6,7]. Until recently, however, the existing MIMO techniques for vital sign detection have been mainly investigated to separate vital signs from multiple sources.The use of MIMO radar technique for vital signal sensing has a number of potential advantages. For a given system design choice, some of these advantages are enhancement of the target detection performance, improvement of the angle estimation accuracy, and a decrease in the minimum detection velocity [8]. A MIMO bio-radar system can also be combined with well-known direction of arrival (DOA) estimation algorithms to provide solutions for direction finding of human subjects. In the present paper, a new approach is presented to find the direction of human vital signals with two identical transceiver architectures sharing a single VCO with a PLL. The MIMO Doppler radar system can be effectively applied to find a human target with respect to azimuth angle, making it a good candidate for applications in home health care systems, military surveillance, as well as security services. To the best of authors' knowledge, this is the first successfully implemented direction finding system for human targets based on a MIMO radar concept. Ⅱ. MIMO Bio-Radar System ConfigurationThe configuration of the proposed integrated MIMO bioradar system is shown in Fig. 1. This monostatic MIMO radar consists of two antennas...

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2.4 GHz bio‐radar system with improved performance by using phase‐locked loop

Cited by 10 publications

References 2 publications

Different Antenna Designs for Non-Contact Vital Signs Measurement: A Review

Different Antenna Designs for Non-Contact Vital Signs Measurement: A Review

Direct conversion Doppler radar vital sign detection system using power management technique

Detection of Human Vital Signs and Estimation of Direction of Arrival Using Multiple Doppler Radars

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