{"title":"Sonar micro-Doppler effect induced by ship oscillatory motion in waves: Phenomenon, model, and experimentation.","authors":"Minhao Wang, Cuie Zheng, Dajun Sun, Jian Xu","doi":"10.1121/10.0035914","DOIUrl":null,"url":null,"abstract":"<p><p>Traditional research attributes the modulated sidebands of ship radiation line-spectrum signals to reflections off rough ocean surfaces, but the Doppler effect caused by vessel motion may also contribute. This study establishes a micro-Doppler signal model based on wave-induced ship swaying, explaining that this phenomenon arises from the ship oscillatory motion in waves. The sea trial results demonstrate that the peak wave frequency, the frequency of ship micro-motions, and the micro-Doppler characteristic frequency recorded by the beacon exhibit a sudden frequency shift occurring synchronously from 0.075 to 0.115 Hz, thereby verifying the validity of the proposed model.</p>","PeriodicalId":73538,"journal":{"name":"JASA express letters","volume":"5 2","pages":""},"PeriodicalIF":1.2000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JASA express letters","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1121/10.0035914","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ACOUSTICS","Score":null,"Total":0}
引用次数: 0
Abstract
Traditional research attributes the modulated sidebands of ship radiation line-spectrum signals to reflections off rough ocean surfaces, but the Doppler effect caused by vessel motion may also contribute. This study establishes a micro-Doppler signal model based on wave-induced ship swaying, explaining that this phenomenon arises from the ship oscillatory motion in waves. The sea trial results demonstrate that the peak wave frequency, the frequency of ship micro-motions, and the micro-Doppler characteristic frequency recorded by the beacon exhibit a sudden frequency shift occurring synchronously from 0.075 to 0.115 Hz, thereby verifying the validity of the proposed model.