文章摘要
殷丽君,吴金荣,侯倩男.浅海近程混响的振荡现象*[J].,2021,40(6):828-832
浅海近程混响的振荡现象*
Fluctuation of short-rang reverberation in shallow water
投稿时间:2021-02-24  修订日期:2021-11-05
中文摘要:
      研究浅海近程混响特性对于评估和提高主动声纳性能具有重要意义。多次浅海混响实验显示,近程混响强度存在稳定的振荡现象,脉宽基本对振荡的幅度和周期没有影响。为解释这一现象,本文基于射线理论和小斜率近似给出了浅海近程混响模型,仿真与实测数据结果基本吻合。数值仿真结果表明:海底反射声场对单站声纳接收到回声信号的贡献远小于海底近垂向大掠射角散射声场的作用;混响强度振荡现象是海底近程散射声场的多途现象造成的,并由此给出了振荡周期与海深及收发深度的关系。
英文摘要:
      Short-rang reverberation in shallow water has an important impact on estimation and improvement of sonar performance. Previous reverberation trials in shallow water suggest that short-range reverberation exhibits a stable fluctuation phenomenon, and pulse lengths nearly have no effect on amplitude and period of fluctuation. To illustrate characteristics of short-range reverberation in shallow water, a reverberation model is proposed based on ray theory and small-slope approximation. Simulation results show in good agreement with experimental data. The results indicate that the reflecting energy from bottom is far less than the scattering energy at large grazing angle from roughness bottom interface for monostatic sonar. Moreover, fluctuation phenomenon of reverberation intensity is caused by time delay of bottom scattering energy from different rays in short range. Accordingly, relationship between period of fluctuation and depth of water, source or receiver can be determined.
DOI:10.11684/j.issn.1000-310X.2021.06.004
中文关键词: 混响  小斜率近似  射线理论
英文关键词: reverberation  small-slope approximation  ray theory  
基金项目:国家自然科学基金(11774375,11974375)
作者单位E-mail
殷丽君* 中国科学院声学研究所 中科院水声环境特性重点实验室 北京 yinlijun@mail.ioa.ac.cn 
吴金荣 中国科学院声学研究所 wujinrong@mail.ioa.ac.cn 
侯倩男 中国科学院声学研究所 中科院水声环境特性重点实验室 北京 houqiannan@mail.ioa.ac.cn 
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