浅海均匀层远程混响的垂直相干性
THE VERTICAL COHERENCE OF LONG - RANGE REVERBERATION IN THE SHALLOW WATER HOMOGENEOUS LAYER
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摘要: 混响是主动声纳在浅海环境中的一种干扰,有关其空间相关特性,Urick和Lund发表了两篇实验性报告[7].本文根据浅海平均声场角度谱分析法[3],从理论上计算了浅海均匀层远程混响垂直相关特性与界面反射、散射等环境参数之间的关系,及其随距离、水听器间隔的变化,供声纳设计或在浅海环境中研究低频、小掠角的散射特性时参考.Abstract: By using the method of the angular power spectrum for shallow-water averaged sound field, the vertical coherence of shallow-water long-range reverberation was calculated.The relations between the cross-correlation coefficient of the reverberation and relevant parameters such as boundary reflection and scattering, distance(or time),hydrophone separation and signal fregnency etc are given. The results would be helpful for analysis of the angular dependence of bottom(or surface) scattering at low grazing angle in shallow-water environmen.
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尚尔昌,1976.Scientia Sinica,XIX :794-804. 周纪得,1979.声学学报,(1):34-43. 周纪得,浅海平均声场角度谱分析法与回波、混响比的距离深度结构(声学学报待发表). Cron,B.F.and C.H.Sherman,1962.JASA 34:1732-1736. Ma,ckenzie,K.V.,1961.JASA,33:1498-1504. Smith,P.W.,1976.JASA,60:305-316. Urick,R.J.and G.R.Lund,1970.,1ASA,47:342-349,909-911. Брехвских.Л.М.,1974."Акустика Океана". Олъшевский,В.В.,1966."Сгатистические Свойства Морской еверберации". -
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