{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,8]],"date-time":"2025-11-08T17:45:14Z","timestamp":1762623914759,"version":"build-2065373602"},"reference-count":25,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2017,9,6]],"date-time":"2017-09-06T00:00:00Z","timestamp":1504656000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"State Key Program of Basic Research of China","award":["613196"],"award-info":[{"award-number":["613196"]}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61673066"],"award-info":[{"award-number":["61673066"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Currently, frequency-modulated continuous-wave (FMCW) proximity sensors are widely used. However, they suffer from a serious sweep jamming problem, which significantly reduces the ranging performance. To improve its anti-jamming capability, this paper analyzed the response mechanism of a proximity sensor with the existence of real target echo signals and sweep jamming, respectively. Then, a multi-channel harmonic timing sequence detection method, using the spectrum components\u2019 distribution difference between the real echo signals and sweep jamming, is proposed. Moreover, a novel fast Fourier transform (FFT)-based implementation was employed to extract multi-channel harmonic information. Compared with the traditional band-pass filter (BPF) implementation, this novel realization scheme only computes FFT once, in each transmission cycle, which significantly reduced hardware resource consumption and improved the real-time performance of the proximity sensors. The proposed method was implemented and proved to be feasible through the numerical simulations and prototype experiments. The results showed that the proximity sensor utilizing the proposed method had better anti-sweep jamming capability and ranging performance.<\/jats:p>","DOI":"10.3390\/s17092042","type":"journal-article","created":{"date-parts":[[2017,9,6]],"date-time":"2017-09-06T11:23:34Z","timestamp":1504697014000},"page":"2042","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Anti-Sweep Jamming Design and Implementation Using Multi-Channel Harmonic Timing Sequence Detection for Short-Range FMCW Proximity Sensors"],"prefix":"10.3390","volume":"17","author":[{"given":"Zhijie","family":"Kong","sequence":"first","affiliation":[{"name":"School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China"}]},{"given":"Ping","family":"Li","sequence":"additional","affiliation":[{"name":"School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China"}]},{"given":"Xiaopeng","family":"Yan","sequence":"additional","affiliation":[{"name":"School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6448-4839","authenticated-orcid":false,"given":"Xinhong","family":"Hao","sequence":"additional","affiliation":[{"name":"School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China"}]}],"member":"1968","published-online":{"date-parts":[[2017,9,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1692","DOI":"10.1109\/TMTT.2017.2650911","article-title":"A Review on Recent Progress of Portable Short-Range Noncontact Microwave Radar Systems","volume":"65","author":"Li","year":"2017","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"7412","DOI":"10.3390\/s150407412","article-title":"A Noncontact FMCW Radar Sensor for Displacement Measurement in Structural Health Monitoring","volume":"15","author":"Li","year":"2015","journal-title":"Sensors"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Ritchie, M., Ash, M., Chen, Q., and Chetty, K. (2016). Through Wall Radar Classification of Human Micro-Doppler Using Singular Value Decomposition Analysis. Sensors, 16.","DOI":"10.20944\/preprints201608.0233.v1"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"4527","DOI":"10.3390\/s130404527","article-title":"Localization and Mapping Using Only a Rotating FMCW Radar Sensor","volume":"13","author":"Damien","year":"2013","journal-title":"Sensors"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"922","DOI":"10.1186\/s40064-016-2611-9","article-title":"An LFMCW detector with new structure and FRFT based differential distance estimation method","volume":"5","author":"Yue","year":"2016","journal-title":"Springer Plus"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"834","DOI":"10.1109\/TGRS.2016.2616134","article-title":"Ultrawideband FMCW Radar for Airborne Measurements of Snow Over Sea Ice and Land","volume":"55","author":"Yan","year":"2017","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"3517","DOI":"10.1109\/TIM.2015.2450294","article-title":"Design of an FMCW radar altimeter for wide-range and low measurement error","volume":"64","author":"Choi","year":"2015","journal-title":"IEEE Trans. Instrum. Meas."},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Balal, N., Pinhasi, G.A., and Pinhasi, Y. (2016). Atmospheric and Fog Effects on Ultra-Wide Band Radar Operating at Extremely High Frequencies. Sensors, 16.","DOI":"10.3390\/s16050751"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Wang, R., Chen, J., Wang, X., and Sun, B. (2017). High-Performance Anti-Retransmission Deception Jamming Utilizing Range Direction Multiple Input and Multiple Output (MIMO) Synthetic Aperture Radar (SAR). Sensors, 17.","DOI":"10.3390\/s17010123"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Choi, Y.S., Lee, S.Y., Choi, H.H., Lee, S.J., and Park, C.S. (2014, January 5\u20138). The improved spatial nuller with frequency swept jammer. Proceedings of the Position, Location and Navigation Symposium, Monterey, CA, USA.","DOI":"10.1109\/PLANS.2014.6851477"},{"key":"ref_11","unstructured":"Choi, D.Y., Kim, W.K., Kim, J.H., and Cho, H. (2016, January 5\u20138). Performance of analog and digital modulation schemes under sweep jamming. Proceedings of the Eighth International Conference on Ubiquitous and Future Networks, Vienna, Austria."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Mighani, S., Mivehchy, M., and Sabahi, M.F. (2014, January 9\u201311). Evaluating sweep noisy barrage jamming effect on tracking radar based on functioning destruction time. Proceedings of the International Symposium on Telecommunications, Tehran, Iran.","DOI":"10.1109\/ISTEL.2014.7000737"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"334","DOI":"10.1002\/mop.30277","article-title":"FMCW transceiver of short-range proximity sensor in sea clutter","volume":"59","author":"Choi","year":"2017","journal-title":"Microw. Opt. Technol. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"3079","DOI":"10.1109\/JSEN.2013.2260326","article-title":"A design and assessment of a direction finding proximity fuze sensor","volume":"13","author":"Choi","year":"2013","journal-title":"IEEE Sens. J."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"8283","DOI":"10.3390\/s140508283","article-title":"Dynamic compressed HRRP generation for random stepped-frequency radar based on complex-valued fast sequential homotopy","volume":"14","author":"You","year":"2014","journal-title":"Sensors"},{"key":"ref_16","unstructured":"Max, P. (2012, January 12\u201315). New Generation Naval Artillery Multi-Function Fuze. Proceedings of the 56th Annual Fuze Conference, Baltimore, MD, USA."},{"key":"ref_17","first-page":"1820","article-title":"Research on Modeling and Simulation of Echo Signal of Pulse Doppler Fuze and Judgment Criterion of Its Impact","volume":"37","author":"Xiao","year":"2016","journal-title":"Acta Armament."},{"key":"ref_18","first-page":"254","article-title":"Recognition of target and jamming signal for FM fuze based on entropy features","volume":"38","author":"Huang","year":"2017","journal-title":"Acta Armament."},{"key":"ref_19","unstructured":"Li, Z., Hao, X., Chen, H., and Li, P. (2013, January 20\u201322). Target signal recognition for CW Doppler proximity radio detector based on SVM. Proceedings of the International Conference on Mechatronic Sciences, Electric Engineering and Computer, Shengyang, China."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Beasley, P. (2006, January 13\u201315). The Influence of Transmitter Phase Noise on FMCW Radar Performance. Proceedings of the Radar Conference, Manchester, UK.","DOI":"10.1109\/EURAD.2006.280342"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"870","DOI":"10.1109\/JSEN.2009.2024058","article-title":"Development of a Microwave Proximity Sensor for Industrial Applications","volume":"9","author":"Fericean","year":"2008","journal-title":"IEEE Sens. J."},{"key":"ref_22","unstructured":"Komarov, I., and Sergey, M. (2003). Fundamentals of Short-Range FM Proximity Sensor, Artech House."},{"key":"ref_23","unstructured":"Zuo, H.Y., Hao, X.H., and Yue, K. (2017, July 20). Anti-AM Jamming Performance of FM Doppler Fuze. Available online: http:\/\/www.cnki.net\/kcms\/detail\/11.2625.V.20170203.1448.001.html."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"3290","DOI":"10.1109\/TMTT.2016.2599165","article-title":"Impact of frequency ramp nonlinearity, phase noise, and SNR on FMCW radar accuracy","volume":"64","author":"Ayhan","year":"2016","journal-title":"IEEE Trans. Microw. Theory Tech."},{"key":"ref_25","unstructured":"Zhao, H.C. (2012). Fundamentals and Methodology of Radio Fuze, National Defense Industry Press."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/9\/2042\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T18:44:15Z","timestamp":1760208255000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/17\/9\/2042"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2017,9,6]]},"references-count":25,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2017,9]]}},"alternative-id":["s17092042"],"URL":"https:\/\/doi.org\/10.3390\/s17092042","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2017,9,6]]}}}