人体呼吸非接触测量中IR-UWB雷达关键参数的研究
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摘要
等效采样间隔是脉冲超宽带(IR-UWB)雷达的一个重要参数,本文从理论和实验两方面首次研究了该参数对IR-UWB雷达非接触呼吸测量性能的影响。结果表明,等效采样间隔应小于人体呼吸引起的体表微动位移的一半,这是IR-UWB雷达非接触测量人体呼吸的前提条件。因此,可通过减小等效采样间隔来提高IR-UWB雷达的呼吸测量性能。此外,IR-UWB雷达的等效采样间隔同时决定了等效采样周期(即回波慢时间周期),降低等效采样周期对IRUWB雷达的呼吸测量性能无显著影响。上述研究结果对非接触生命信号测量中的IR-UWB雷达系统设计具有指导意义。
The equivalent-time sampling interval is one of the most important parameters for the impulse-radio ultra-wideband(IR-UWB) radar that concerns the remote measurement of respiration, which was theoretically and experimentally investigated in this paper for the first time. According to the measurement results, the interval had to be smaller than half of the thorax displacement due to the respiration. Therefore, it should be as small as possible for improving the respiration measurement capability of the IR-UWB radar. The equivalent-time sampling period of IR-UWB radar was also determined by the equivalent-time sampling interval. Reduction of the equivalent-time sampling period had no obvious influence on the improvement of the respiration measurement capability. The study in this paper presents significance for the design of the IR-UWB radar in the application of remote vital sign measurement.
The equivalent-time sampling interval is one of the most important parameters for the impulse-radio ultra-wideband(IR-UWB) radar that concerns the remote measurement of respiration, which was theoretically and experimentally investigated in this paper for the first time. According to the measurement results, the interval had to be smaller than half of the thorax displacement due to the respiration. Therefore, it should be as small as possible for improving the respiration measurement capability of the IR-UWB radar. The equivalent-time sampling period of IR-UWB radar was also determined by the equivalent-time sampling interval. Reduction of the equivalent-time sampling period had no obvious influence on the improvement of the respiration measurement capability. The study in this paper presents significance for the design of the IR-UWB radar in the application of remote vital sign measurement.
引文
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[20]胡冶,李川涛,祁富贵,等.一种非接触式呼吸暂停报警装置的研制[J].中国医疗设备,2015,30(5):18-20.
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[2]Staderini EM.UWB radars in medicine[J].IEEE Aerospace Electronic Systems Magazine,,2002,17(1):13-18.
[3]Bugaev AS,Chapursky VV,Ivashov SI,et al.Through wall sensing of human breathing and heart beating by monochromatic radar[C].Conference:Ground Penetrating Radar,2004.Proceedings of the Tenth International Conference on,IEEE,2004,l:291-294.
[4]Droitcour AD,Boric-Lubecke O,Lubecke VM,et al.Range correlation and I/Q performance benefits in single-chip silicon Doppler radars for noncontact cardiopulmonary monitoring[J].IEEE Transactions on Microwave Theory and Techniques,2004,52(3):838-848.
[5]Dei D,Grazzini G,Luzi G,et al.Non-contact detection of breathing using a microwave sensor[J].Sensors(Basel),2009,9(4):2574-2585.
[6]Lu G,Yang F,Tian Y,et al.Contact-free measurement of heart rate variability via a microwave sensor[J].Sensors(Basel),2009,9(12):9572-9581.
[7]Barrett TW.History of ultrawideband(UWB)radar&communications:pioneers and innovators[C].Progress in Electromagnetics Symposium,2000:l-42.
[8]ImmoreevI,Samkov S,Tao TH.Short-distance ultra wideband radars[J].IEEE Aerospace Electronic Systems Magazine,2005,20(6):9-14.
[9]Azevedo S,McEwan TE.Micropower impulse radar[J].IEEE Potentials,1997,16(2):15-20.
[10]Fontana RJ.Recent system applications of short-pulse ultrawideband(UWB)technology[J].IEEE Transactions on Microwave Theory and Techniques,2004,52(9):2087-2104.
[11]Yarovoy AG,Zhuge X,Savelyev TG,et al.Comparison of UWB technologies for human being detection with radar[C].Radar Conference,2007:295-298.
[12]Venkatesh S,Anderson CR,Rivera NV,et al.Implementation and analysis of respiration-rate estimation using impulse-based UWB[C].Military Communications Conference,2005:3314-3320.
[13]Lazaro A,Girbau D,Villarino R.Analysis of vital signs monitoring using an IR-UWB radar[J].Progress In Electromagnetics Research,2010,100:265-284.
[14]Ossberger G,Buchegger T,Schimb(a|¨)ck E,et al.Non-invasive respiratory movement detection and monitoring of hidden humans using ultra wideband pulse radar[C].Ultra Wideband Systems,2004.Joint with Conference on Ultrawideband Systems and Technologies Joint UWBST&IWUWBS.2004 International Workshop on.IEEE,2004:395-399.
[15]Yarovoy AG,Ligthart LP,Matuzas J,et al.UWB radar for human being detection[J].IEEE Aerospace and Electronic Systems Magazine,2006,21(3):10-14.
[16]Chernyak V.Signal processing in multisite UWB radar devices for searching survivors in rubble[C].Radar Conference,2006.EuRAD 2006.3rd European.IEEE,2006:190-193.
[17]Lv H,Lu GH,Jing XJ,et al.A new ultra-wideband radar for detecting survivors buried under earthquake rubbles[J].Microwave and Optical Technology Letters,2010,52(11):2621-2624.
[18]Nezirovic A,Yarovoy AG,Ligthart LP.Signal processing for improved detection of trapped victims using UWB radar[J].IEEE Transactions on Geoscience and Remote Sensing,2010,48(4):2005-2014.
[19]Sachs J,Helbig M,Herrmann R,et al.Remote vital sign detection for rescue,security,and medical care by ultra-wideband pseudo-noise radar[J].Ad Hoc Networks,2014,13:42-53.
[20]胡冶,李川涛,祁富贵,等.一种非接触式呼吸暂停报警装置的研制[J].中国医疗设备,2015,30(5):18-20.
[21]Liu L,Liu Z,Xie H,et al.Numerical simulation of UWB impulse radar vital sign detection at an earthquake disaster site[J].Ad Hoc Networks,2014,13:34-41.