U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic Radar
Amidst the global aging trend and a growing emphasis on healthy living, there is an increased demand for unobtrusive home health monitoring systems. However, the current mainstream detection methods in this regard suffer from low privacy trust, poor electromagnetic compatibility, and high manufactur...
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| Format: | Article |
| Language: | English |
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China Science Publishing & Media Ltd. (CSPM)
2025-02-01
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| Series: | Leida xuebao |
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| Online Access: | https://radars.ac.cn/cn/article/doi/10.12000/JR24114 |
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| author | Shuaiming HUANG Xiaohua ZHU Wubin WANG Heng ZHAO Hong HONG |
| author_facet | Shuaiming HUANG Xiaohua ZHU Wubin WANG Heng ZHAO Hong HONG |
| author_sort | Shuaiming HUANG |
| collection | DOAJ |
| description | Amidst the global aging trend and a growing emphasis on healthy living, there is an increased demand for unobtrusive home health monitoring systems. However, the current mainstream detection methods in this regard suffer from low privacy trust, poor electromagnetic compatibility, and high manufacturing costs. To address these challenges, this paper introduces a noncontact vital signal collection device using Ultrasonic radar (U-Sodar), including a set of hardware based on a three-transmitter four-receiver Multiple Input Multiple Output (MIMO) architecture and a set of signal processing algorithms. The U-Sodar local oscillator uses frequency division technology with low phase noise and high detection accuracy; the receiver employs front-end direct sampling technology to simplify the involved structure and effectively reduce external noise, and the transmitter uses an adjustable PWM direct drive to emit various ultrasonic waveforms, possessing software-defined ultrasonic system characteristics. The signal processing algorithm of U-Sodar adopts the graph processing technique of signal chord length and realizes accurate recovery of signal phase under 5 dB Signal-to-Noise Ratio (SNR) using picture filtering and then reconstruction. Experimental tests on the U-Sodar system demonstrated its anti-interference and penetration capabilities, proving that ultrasonic penetration relies on material porosity rather than intermedium vibration conduction. The minimum measurable displacement for a given SNR with correct demodulation probability is also derived. The results of actual human vital sign signal measurement experiments indicate that U-Sodar can accurately measure respiration and heartbeat at 3.0 m and 1.5 m, respectively, and the heartbeat waveforms can be measured within 1.0 m. Overall, the experimental results demonstrate the feasibility and application potential of U-Sodar in noncontact vital sign detection. |
| format | Article |
| id | doaj-art-f3ea32972ef648ff97de828cef55259a |
| institution | Kabale University |
| issn | 2095-283X |
| language | English |
| publishDate | 2025-02-01 |
| publisher | China Science Publishing & Media Ltd. (CSPM) |
| record_format | Article |
| series | Leida xuebao |
| spelling | doaj-art-f3ea32972ef648ff97de828cef55259a2025-01-22T06:12:25ZengChina Science Publishing & Media Ltd. (CSPM)Leida xuebao2095-283X2025-02-0114116818810.12000/JR24114R24114U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic RadarShuaiming HUANG0Xiaohua ZHU1Wubin WANG2Heng ZHAO3Hong HONG4Nanjing University of Science and Technology, Nanjing 210000, ChinaNanjing University of Science and Technology, Nanjing 210000, ChinaNorth Institute of Automatic Control Technology, Taiyuan 030006, ChinaNanjing University of Science and Technology, Nanjing 210000, ChinaNanjing University of Science and Technology, Nanjing 210000, ChinaAmidst the global aging trend and a growing emphasis on healthy living, there is an increased demand for unobtrusive home health monitoring systems. However, the current mainstream detection methods in this regard suffer from low privacy trust, poor electromagnetic compatibility, and high manufacturing costs. To address these challenges, this paper introduces a noncontact vital signal collection device using Ultrasonic radar (U-Sodar), including a set of hardware based on a three-transmitter four-receiver Multiple Input Multiple Output (MIMO) architecture and a set of signal processing algorithms. The U-Sodar local oscillator uses frequency division technology with low phase noise and high detection accuracy; the receiver employs front-end direct sampling technology to simplify the involved structure and effectively reduce external noise, and the transmitter uses an adjustable PWM direct drive to emit various ultrasonic waveforms, possessing software-defined ultrasonic system characteristics. The signal processing algorithm of U-Sodar adopts the graph processing technique of signal chord length and realizes accurate recovery of signal phase under 5 dB Signal-to-Noise Ratio (SNR) using picture filtering and then reconstruction. Experimental tests on the U-Sodar system demonstrated its anti-interference and penetration capabilities, proving that ultrasonic penetration relies on material porosity rather than intermedium vibration conduction. The minimum measurable displacement for a given SNR with correct demodulation probability is also derived. The results of actual human vital sign signal measurement experiments indicate that U-Sodar can accurately measure respiration and heartbeat at 3.0 m and 1.5 m, respectively, and the heartbeat waveforms can be measured within 1.0 m. Overall, the experimental results demonstrate the feasibility and application potential of U-Sodar in noncontact vital sign detection.https://radars.ac.cn/cn/article/doi/10.12000/JR24114non-contact detectionvital signals detectioncw radarultrasoundu-sodar |
| spellingShingle | Shuaiming HUANG Xiaohua ZHU Wubin WANG Heng ZHAO Hong HONG U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic Radar Leida xuebao non-contact detection vital signals detection cw radar ultrasound u-sodar |
| title | U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic Radar |
| title_full | U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic Radar |
| title_fullStr | U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic Radar |
| title_full_unstemmed | U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic Radar |
| title_short | U-Sodar: Noncontact Vital Sign Detection Technology Based on Ultrasonic Radar |
| title_sort | u sodar noncontact vital sign detection technology based on ultrasonic radar |
| topic | non-contact detection vital signals detection cw radar ultrasound u-sodar |
| url | https://radars.ac.cn/cn/article/doi/10.12000/JR24114 |
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