Acoustic multipath propagation in deep ocean with a typical summer sound speed profile

摘要：

　　Acoustic multipath propagation in deep water is of great difference to in shallow water, due to its vertical structure of sound speed profile.This paper analyzes multipath arrivals using data from the SCAEIS experiment, which was conducted in the South China Sea in September 2016, and the results are compared with simulation work using Bellhop model.SCAEIS included a towed source transmitting CW, and vertical line array receivers at the depth 5-200m.The measured sound speed profiles are featured with surface mixed-layer of about 45m and strong thermocline from 45 to 300m, and SOFAR axis is about 1100m.Two keys results are gotten.First, energy of the 1st-reflected arrival ranks the biggest among all multipath arrivals.Second, amplitude of direct arrival decreases downward quickly from the surface mixture layer, and direct wave surfers severer effect of the surface cutoff frequency than other arrivals.

关键词： Multipath propagation Direct arrival Reflected-arrival Surface mixed-layer Thermocline

作者: Fei GAO Lei SUN

作者单位: Naval Academy, Institution of Ocean Environment, Underwater Acoustic Environment Laboratory, Tianjin Naval Academy, Institution of Ocean Environment, Underwater Acoustic Environment Laboratory, Tianjin

会议类型: 国际会议

会议名称: 2018 International Conference on Defence Technology (2018国际防务技术会议)

会议地点: 北京

会议语种:英文

页码: 999-1005

在线出版日期: 2018-10-21（万方平台首次上网日期，不代表论文的发表时间）