scholarly journals A Novel Wireless-Netted UWB Life-Detection Radar System for Quasi-Static Person Sensing

2021 ◽  
Vol 11 (1) ◽  
pp. 424
Author(s):  
Kun Yan ◽  
Shiyou Wu ◽  
Shengbo Ye ◽  
Guangyou Fang
Keyword(s):  
Detection System ◽  
Signal To Noise Ratio ◽  
Observation Point ◽  
Radar System ◽  
Brick Wall ◽  
Efficient Detection ◽  
Human Respiration ◽  
Radar Applications ◽  
Life Detection ◽  
Point Detection

In actual life-detection radar applications, a quasi-static person with weak respiration is difficult to find when relying on the echoes from a single fixed observation point. To effectively sense the weak respiration of a quasi-static person in complex through-wall and through-floor conditions, this paper proposes a novel multi-observation point detection system composed of multiple Golay complementary coded radars in which communication and synchronization are carried out wirelessly. The collaboration structure and Golay complementary coded transmitter improve the signal to noise ratio (SNR). Proof-of-principle experiments are carried out with our designed radar prototype and prove that the radar system can detect a respiring target 21 m behind a brick wall or a respiring target behind two levels of reinforced concrete floors, validating the effectiveness of a multi-observation point working mode for the efficient detection of weak human respiration.

scholarly journals Portable Micro-Doppler Radar with Quadrature Radar Architecture for Non-Contact Human Breath Detection

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5807
Author(s):  
Catur Apriono ◽  
Fathul Muin ◽  
Filbert H. Juwono
Keyword(s):  
Respiration Rate ◽  
Doppler Radar ◽  
Detection System ◽  
Experimental System ◽  
Radar System ◽  
Acceptable Error ◽  
Radio Detection ◽  
Human Respiration ◽  
Technology Applications ◽  
Main Component

Recently, rapid advances in radio detection and ranging (radar) technology applications have been implemented in various fields. In particular, micro-Doppler radar has been widely developed to perform certain tasks, such as detection of buried victims in natural disaster, drone system detection, and classification of humans and animals. Further, micro-Doppler radar can also be implemented in medical applications for remote monitoring and examination. This paper proposes a human respiration rate detection system using micro-Doppler radar with quadrature architecture in the industrial, scientific, and medical (ISM) frequency of 5.8 GHz. We use a mathematical model of human breathing to further explore any insights into signal processes in the radar. The experimental system is designed using the USRP B200 mini-module as the main component of the radar and the Vivaldi antennas working at 5.8 GHz. The radar system is integrated directly with the GNU Radio Companion software as the processing part. Using a frequency of 5.8 GHz and USRP output power of 0.33 mW, our proposed method was able to detect the respiration rate at a distance of 2 m or less with acceptable error. In addition, the radar system could differentiate different frequency rates for different targets, demonstrating that it is highly sensitive. We also emphasize that the designed radar system can be used as a portable device which offers flexibility to be used anytime and anywhere.

scholarly journals A printed lens in antenna’s aperture to improve the performance of UWB-radar system

2021 ◽  
Author(s):  
Vipin Choudhary ◽  
Daniel Rönnow ◽  
Malay Ranjan Tripathy
Keyword(s):  
Signal To Noise Ratio ◽  
Complex Refractive Index ◽  
Wide Band ◽  
Industrial Applications ◽  
Radar System ◽  
Band Frequency ◽  
Planar Substrate ◽  
Radar Applications ◽  
Strip Lines ◽  
Non Destructive

Abstractwe present a printed lens for radar applications. The structure of the presented lens consists of an array of modified micro-strip lines, which is positioned in the antenna’s aperture on the same planar substrate. Simulations show that the gain and directivity increase with the proposed lens in a wide band frequency band. The proposed design is insensitive to rotation of the antenna. This paper focuses on real industrial applications and problems. Further, we show that the lens can be used to improve the object detection ability of an ultrawide band radar system, which is used in industrial applications such as non-destructive monitoring of built-structures and for use in the renovation process. The signal to noise ratio is improved. Furthermore, we show how the microwave lens can also be used to reduce the clutter in applications where the complex refractive index of objects is determined. Further, different simulated results (for different cases) are compared, presented and concluded.

scholarly journals Scanning single-molecule counting system for Eprobe with highly simple and effective approach

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0243319
Author(s):  
Takeshi Hanami ◽  
Tetsuya Tanabe ◽  
Takuya Hanashi ◽  
Mitsushiro Yamaguchi ◽  
Hidetaka Nakata ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Single Molecule ◽  
Detection System ◽  
Signal To Noise Ratio ◽  
High Sensitivity ◽  
Nucleic Acid Detection ◽  
Digital Measurement ◽  
Excitation Light ◽  
Target Nucleic Acid ◽  
Fluorescent Molecules

Here, we report a rapid and ultra-sensitive detection technique for fluorescent molecules called scanning single molecular counting (SSMC). The method uses a fluorescence-based digital measurement system to count single molecules in a solution. In this technique, noise is reduced by conforming the signal shape to the intensity distribution of the excitation light via a circular scan of the confocal region. This simple technique allows the fluorescent molecules to freely diffuse into the solution through the confocal region and be counted one by one and does not require statistical analysis. Using this technique, 28 to 62 aM fluorescent dye was detected through measurement for 600 s. Furthermore, we achieved a good signal-to-noise ratio (S/N = 2326) under the condition of 100 pM target nucleic acid by only mixing a hybridization-sensitive fluorescent probe, called Eprobe, into the target oligonucleotide solution. Combination of SSMC and Eprobe provides a simple, rapid, amplification-free, and high-sensitive target nucleic acid detection system. This method is promising for future applications to detect particularly difficult to design primers for amplification as miRNAs and other short oligo nucleotide biomarkers by only hybridization with high sensitivity.

scholarly journals Accurate and Efficient Representation of Obstacles Using Radar Visualizer

2021 ◽  
Vol 9 (VI) ◽  
pp. 4429-4431
Author(s):  
K. Akanksha
Keyword(s):  
Detection System ◽  
Target Position ◽  
Radar System ◽  
Motor Vehicles ◽  
Radio Waves ◽  
Receiving Antenna ◽  
Efficient Representation ◽  
Transmitting Antenna ◽  
Analyze Data

Radar is a detection system that uses radio waves to determine the range, angle or velocity of objects. It can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain. A radar system consist of a transmitting antenna, a receiving antenna (often same antenna is used for transmitting and receiving) and a receiver and process to determine properties of the objects. In our project we are detecting the target position of the obstacles that come in our way be it in military, aircrafts, ships, clouds, etc. using MATLAB. Using MATLAB, you can: analyze data, develop algorithms, create models and applications. The language, apps, and build in math functions enable you to quickly explore multiple approaches to arrive at a solution. Using MATLAB and Simulink we are doing radar visualizer.

Ultra-Wideband Chaos Life-Detection Radar with Sinusoidal Wave Modulation

2017 ◽  
Vol 27 (13) ◽  
pp. 1730046 ◽  
Author(s):  
Hang Xu ◽  
Ying Li ◽  
Jianguo Zhang ◽  
Hong Han ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Vital Signs ◽  
Radar System ◽  
Ultra Wideband ◽  
Thick Wall ◽  
Sinusoidal Wave ◽  
Echo Signal ◽  
Range Resolution ◽  
Life Detection ◽  
Lock In

We propose and experimentally demonstrate an ultra-wideband (UWB) chaos life-detection radar. The proposed radar transmits a wideband chaotic-pulse-position modulation (CPPM) signal modulated by a single-tone sinusoidal wave. A narrow-band split ring sensor is used to collect the reflected sinusoidal wave, and a lock-in amplifier is utilized to identify frequencies of respiration and heartbeat by detecting the phase change of the sinusoidal echo signal. Meanwhile, human location is realized by correlating the CPPM echo signal with its delayed duplicate and combining the synthetic aperture technology. Experimental results demonstrate that the human target can be located accurately and his vital signs can be detected in a large dynamic range through a 20-cm-thick wall using our radar system. The down-range resolution is 15[Formula: see text]cm, benefiting from the 1-GHz bandwidth of the CPPM signal. The dynamic range for human location is 50[Formula: see text]dB, and the dynamic ranges for heartbeat and respiration detection respectively are 20[Formula: see text]dB and 60[Formula: see text]dB in our radar system. In addition, the bandwidth of the CPPM signal can be adjusted from 620[Formula: see text]MHz to 1.56[Formula: see text]GHz to adapt to different requirements.

Nano-copper Enhanced Flexible Device for Simultaneous Measurement of Human Cardio-pulmonary Activities

2020 ◽  
Author(s):  
Li Wang ◽  
Feng Zhang ◽  
Kechao Lu ◽  
Mohammed Abdulaziz ◽  
Chao Li ◽  
...  
Keyword(s):  
Simulation Analysis ◽  
Signal To Noise Ratio ◽  
Simultaneous Detection ◽  
Vital Signs ◽  
Electrical Measurement ◽  
Sensing Element ◽  
Flexible Device ◽  
System Disease ◽  
Compact Size ◽  
Human Respiration

Abstract Background: Cardiopulmonary activities reflect the ability of the human heart to pump blood and the lungs to inhale oxygen. Thus, a device could simultaneously measure electro-cardiac signal and respiratory pressure could provide vital signs for predicting early warning of cardio-pulmonary function-related chronic diseases such as cardiovascular disease, and respiratory system disease. Results: In this study, a flexible device integrated with piezo-resistive sensing element and voltage-sensing element was developed to simultaneously measure human respiration and electro-cardiac signal (including respiratory pressure, respiration frequency, and respiration rhythm; electro-cardio frequency, electro-cardio amplitude, and electro-cardio rhythm). When applied to the measurement of respiratory pressure, the piezo-resistive performance of the device was enhanced by nano-copper modification, which detection limitation of pressure can reduce to 100 Pa and the sensitivity of pressure can achieve to 0.053 ± 0.00079 kPa-1. In addition, the signal-to-noise ratio during bio-electrical measurement was increased to 10.7 ± 1.4, five times better than that of the non-modified device. Conclusion: This paper presents a flexible device for the simultaneous detection of human respiration and cardiac electrical activity. To avoid interference between the two signals, the layout of the electrode and the strain sensor was optimized by FEA simulation analysis. To improve the piezo-resistive sensitivity and bio-electric capturing capability of the device, a feather-shaped nano-copper was modified onto the surface of carbon fiber. The operation simplicity, compact size, and portability of the device open up new possibilities for multi-parameter monitoring.

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