负跃层浅海中信号波形的多速结构
THE MULTIPATH STRUCTURES OF SIGNAL WAVEFORMS IN SHALLOW WATER WITH THERMOCLINE
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摘要: 海洋中水声信号波形的变化规律是一个重要的研究课题,利用信号波形特征可能识别不同的水下目标、提高信号处理的增益.信号波形的规律性也可用来监测某些海洋环境参数的变化.深海中存在较稳定的水下声道,文研究过水下声道中信号波形规律.由于浅海环境的复杂性,海水介质及其边界在空间与时间上存在着有规则的与随机的变化.因而浅海中脉冲信号的波形结构需要进行专门的研究.本文仅就负跃层浅海中的信号波形规律进行一些探讨.Abstract: It was observed in experiments that the signal waveforms in shallow water with thermocline had regular multipath structures and the waveforms of received signals strongly depended on the source and receiver depths.When both the source and receiver were located above the thermocline,each received signal consisted of a train of almost equispaced pulses.
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Житковская,З.В.,Ззв.АН СССР,Физ.атм.и океана,5(1969),306 Fitzgerald,R.M.et al.,J.Acoust.Soc.Amer.,55(1974),47. Weston,D.E.,Andrews.H.W.,J.Sound and Vib.,31(1973),357 Полянская,В.А.,Aky.жyp.,20(1974),95 Porter,R.P.,J.Acoust.Soc.Amer.,56(1974),1426 -
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