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The Multipath Effect and Direct Wave Characteristics of Pulse Waveforms From Towed Sound Source in Deep Sea
Pages: 67-70
Year: Issue:  4
Journal: Hydrographic Surveying and Charting

Keyword:  underwater acoustic signal processingmultipath effectdirect wavetowed sound sourcedeep sea acoustic investigationband-pass filter;
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.
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