海洋测绘2017，Vol.37Issue(4)：67-70,4.DOI:10.3969/j.issn.1671-3044.2017.04.015
拖曳声源深海脉冲多途效应及直达波传播特征
The Multipath Effect and Direct Wave Characteristics of Pulse Waveforms From Towed Sound Source in Deep Sea
摘要
Abstract
The multipath effect is obvious when sound wave transmits in deep sea environment,and the direct wave is seriously affected by the underwater environment.In this paper,the acoustic data of deep sea investigation in South China Sea is used,and the target signal is gotten using Butterworth band pass filter.Then,the characteristics of the target signal with the small,middle,and large distance received by the VLA are analyzed,and the regular of multipath effect and direct wave is explained based on acoustic ray theory.The results show that the target signal with the small distance can be classified into direct wave and two times of seafloor reflection wave,which is classified into direct wave and three times of seafloor reflection wave with the middle distance,and the target signal with the large distance is not obvious enough to be discriminated.The sound intensity of the direct wave is smaller to the first seafloor reflection wave.Sound intensity is the biggest at the subsurface layer of the direct wave due to surface ducts in summer,and it becomes weaker downward at the depth of 50 ～ 200m as the acoustic rays bends down with the control of strong thermocline.Furthermore,direct wave becomes weaker and even unable to discriminate with range increasing.关键词
水声信号处理/多途效应/直达波/拖曳声源/深海水声调查/带通滤波Key words
underwater acoustic signal processing/multipath effect/direct wave/towed sound source/deep sea acoustic investigation/band-pass filter分类
信息技术与安全科学引用本文复制引用
孙芳,高飞,潘长明..拖曳声源深海脉冲多途效应及直达波传播特征[J].海洋测绘,2017,37(4):67-70,4.基金项目
国家自然科学基金(41406004). （41406004）
