{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,26]],"date-time":"2025-10-26T15:02:53Z","timestamp":1761490973219,"version":"build-2065373602"},"reference-count":27,"publisher":"MDPI AG","issue":"4","license":[{"start":{"date-parts":[[2020,4,4]],"date-time":"2020-04-04T00:00:00Z","timestamp":1585958400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Sichuan Province Science and Technology Program Research Project","award":["No.2019YJ0174"],"award-info":[{"award-number":["No.2019YJ0174"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Information"],"abstract":"<jats:p>Non-contact driver respiration rate detection is a challenging problem in the Internet of Vehicles, because the automobile environment is much narrower, and thus the multipath effect is greater. To overcome these challenges, a 2.4 GHz continuous wave forward-scattering radar respiratory detection system is proposed based on the theory that the radar cross-section (RCS) of the human body changes with human breathing. We also analyze the impact of the multipath effect in the vehicle on the received radar signal and compare the output signal captured by a directional antenna with that captured by an omnidirectional antenna in the proposed system. In addition, the mean value of the received signal\u2019s envelope is used to judge whether the driver\u2019s posture is reasonable. Finally, compared with the existing contact respiratory detection system, the actual test results demonstrate the effectiveness of the proposed FSR system, and the driver respiration rates obtained by the proposed system are consistent with those obtained by the contact respiratory detection system.<\/jats:p>","DOI":"10.3390\/info11040192","type":"journal-article","created":{"date-parts":[[2020,4,6]],"date-time":"2020-04-06T05:05:13Z","timestamp":1586149513000},"page":"192","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Non-Contact Driver Respiration Rate Detection Technology Based on Suppression of Multipath Interference with Directional Antenna"],"prefix":"10.3390","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8768-9450","authenticated-orcid":false,"given":"Fan","family":"Yang","sequence":"first","affiliation":[{"name":"School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China"},{"name":"School of physics and electronic information, Inner Mongolia Normal University, Hohhot 010022, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhiming","family":"He","sequence":"additional","affiliation":[{"name":"School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shisheng","family":"Guo","sequence":"additional","affiliation":[{"name":"School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuanhua","family":"Fu","sequence":"additional","affiliation":[{"name":"School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liang","family":"Li","sequence":"additional","affiliation":[{"name":"School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junfeng","family":"Lu","sequence":"additional","affiliation":[{"name":"School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kui","family":"Jiang","sequence":"additional","affiliation":[{"name":"School of Information and Communication Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,4,4]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Kim, J., and Shin, M. (2019). Utilizing HRV-derived respiration measures for driver drowsiness detection. Electronics, 8.","DOI":"10.3390\/electronics8060669"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Valderas, M.T., Bolea, J., Laguna, P., Vallverd\u00fa, M., and Bail\u00f3n, R. (2015, January 25\u201329). Human emotion recognition using heart rate variability analysis with spectral bands based on respiration. Proceedings of the 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), Milan, Italy.","DOI":"10.1109\/EMBC.2015.7319792"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"447","DOI":"10.1081\/JAS-100105865","article-title":"Respiratory Sensations in Asthma: Physiological and Clinical Implications","volume":"38","author":"Harold","year":"2001","journal-title":"J. Asthma"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"58","DOI":"10.1016\/j.comcom.2018.02.006","article-title":"Cognitive Internet of Vehicles","volume":"120","author":"Chen","year":"2018","journal-title":"Comput. Commun."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"He, X., Goubran, R., and Knoefel, F. (2017, January 13\u201315). IR night vision video-based estimation of heart and respiration rates. Proceedings of the 2017 IEEE Sensors Applications Symposium (SAS), Glassboro, NJ, USA.","DOI":"10.1109\/SAS.2017.7894087"},{"key":"ref_6","first-page":"1196","article-title":"Touchless monitoring of breathing function","volume":"26 II","author":"Murthy","year":"2004","journal-title":"Annu. Int. Conf. IEEE Eng. Med. Biol. - Proc."},{"key":"ref_7","first-page":"1","article-title":"Multi-Target Continuous-Wave Vital Sign Radar using 24 GHz Metamaterial Leaky Wave Antennas","volume":"1","author":"Lu","year":"2019","journal-title":"IEEE MTT-S 2019 Int. Microw. Biomed. Conf. IMBioC 2019 - Proc."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"58","DOI":"10.1109\/MMM.2019.2915491","article-title":"Bioradar Technology: Recent Research and Advancements","volume":"20","author":"Zhang","year":"2019","journal-title":"IEEE Microw. Mag."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"988","DOI":"10.1109\/TBME.2009.2032415","article-title":"Thermistor at a distance: Unobtrusive measurement of breathing","volume":"57","author":"Fei","year":"2010","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Fei, J., and Pavlidis, I. (2007, January 22\u201326). Virtual thermistor. Proceedings of the 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Lyon, France.","DOI":"10.1109\/IEMBS.2007.4352271"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Sensing, O. (2019). EM-Wave Biosensors: A Review of RF, Microwave, mm-Wave and Optical Sensing. Sensors, 19.","DOI":"10.3390\/s19051013"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"774","DOI":"10.1109\/JSEN.2018.2878607","article-title":"Detection of Breathing and Heart Rates in UWB Radar Sensor Data Using FVPIEF-Based Two-Layer EEMD","volume":"19","author":"Shyu","year":"2019","journal-title":"IEEE Sens. J."},{"key":"ref_13","unstructured":"Chen, Y., Gunawan, E., Low, K.S., Soh, C.B., and Thi, L.L. (2007, January 9\u201315). Human respiration rate estimation using body-worn ultra-wideband radar. Proceedings of the 2007 IEEE Antennas and Propagation Society International Symposium, Honolulu, HI, USA."},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Prevention, C.C., Leem, S.K., Khan, F., and Cho, S.H. (2017). Vital Sign Monitoring and Mobile Phone Usage Detection Using IR-UWB Radar for Intended Use in car Crash Prevention. Sensors, 17.","DOI":"10.3390\/s17061240"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1073","DOI":"10.1109\/TMTT.2007.895653","article-title":"Arctangent Demodulation With DC Offset Compensation in Quadrature Doppler Radar Receiver Systems","volume":"55","author":"Park","year":"2007","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"3143","DOI":"10.1109\/TMTT.2008.2007139","article-title":"Random body movement cancellation in doppler radar vital sign detection","volume":"56","author":"Li","year":"2008","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_17","unstructured":"Levitas, B., and Matuzas, J. (2010, January 16\u201318). UWB Radar for Breath Detection. Proceedings of the 11th International Radar Symposium, Vilnius, Lithuania."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"292","DOI":"10.1109\/TBCAS.2018.2799322","article-title":"Vital sign monitoring through the back using an UWB impulse radar with body coupled antennas","volume":"12","author":"Schires","year":"2018","journal-title":"IEEE Trans. Biomed. Circuits Syst."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"8162","DOI":"10.1109\/JSEN.2018.2862430","article-title":"A double-sideband continuous-wave radar sensor for carotid wall movement detection","volume":"18","author":"Pisa","year":"2018","journal-title":"IEEE Sens. J."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"2329","DOI":"10.1109\/JSAC.2015.2430294","article-title":"Non-invasive detection of moving and stationary human with WiFi","volume":"33","author":"Wu","year":"2015","journal-title":"IEEE J. Sel. Areas Commun."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2660","DOI":"10.1007\/s11432-011-4476-4","article-title":"Improvement in detection with forward scattering radar","volume":"54","author":"Rasid","year":"2011","journal-title":"Sci. China Inf. Sci."},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Sun, H. (2019, January 22\u201326). Through-the-Wall Human Motion Sensing Based on Forward Scattering. Proceedings of the 2019 IEEE Radar Conference (RadarConf), Boston, MA, USA.","DOI":"10.1109\/RADAR.2019.8835770"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Yang, F., He, Z., Fu, Y., Li, L., Jiang, K., and Xie, F. (2019). Noncontact detection of respiration rate based on forward scatter radar. Sensors, 19.","DOI":"10.3390\/s19214778"},{"key":"ref_24","unstructured":"Chernyak, V.S. (1998). Radar Cross Section (RCS) of Targets. Fundamentals of Multisite Radar Systems: Multistatic Radars and Multistatic Radar Systems, Routledge. [1st ed.]."},{"key":"ref_25","first-page":"157","article-title":"Modeling of Near-field Bistatic RCS of Complex Targets","volume":"30","author":"Chen","year":"2010","journal-title":"J. Proj. Guid."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Gouveia, C., Loss, C., Pinho, P., and Vieira, J. (2019). Different antenna designs for non-contact vital signs measurement: A review. Electronics, 8.","DOI":"10.3390\/electronics8111294"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"4337","DOI":"10.1109\/JSTARS.2016.2636833","article-title":"The Role of the Antenna Radiation Pattern in the Performance of a Microwave Tomographic Approach for GPR Imaging","volume":"10","author":"Comite","year":"2017","journal-title":"IEEE J. Sel. Top. Appl. Earth Obs. Remote Sens."}],"container-title":["Information"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2078-2489\/11\/4\/192\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T09:15:33Z","timestamp":1760174133000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2078-2489\/11\/4\/192"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2020,4,4]]},"references-count":27,"journal-issue":{"issue":"4","published-online":{"date-parts":[[2020,4]]}},"alternative-id":["info11040192"],"URL":"https:\/\/doi.org\/10.3390\/info11040192","relation":{},"ISSN":["2078-2489"],"issn-type":[{"type":"electronic","value":"2078-2489"}],"subject":[],"published":{"date-parts":[[2020,4,4]]}}}