Wave theory analysis for pulse propagated near sound channel axis in deep water

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI:10.1109/OCEANS.2004.1406475

J. Naoi, H. Saito, H. Fujimori, T. Tsuchiya, T. Kikuchi

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Abstract

The conventional ocean acoustic tomography have analyzed by the ray theory. The rays propagating near the SOFAR (SOund Fixing and Ranging) axis have the slowest wave speed and tend to be over-lapped with each other, so that they become a pulse with large amplitude. But it is difficult to use the last pulse for the final analysis, because it could not be discriminated separately in time domain. In this paper, the last pulse propagating near the axis is analyzed in the time domain by the wave theory. First, the variations of the amplitude of the last pulse are obtained as a function of the propagation range. As a result, it is shown that the last pulse is built by a few waves propagating within the SOFAR channel. Next, the propagation depth range of the waves that contribute to the last pulse is determined by the comparison of the peak amplitude variation obtained by the parabolic equation method and those filtered mode pulse. Lastly, the pattern of the peak amplitude of the last pulse is shown. The vertical distributions may be measured by a vertical hydrophone array. It is thought that these results are greatly useful to the future analysis of the ocean acoustic tomography

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深水声道轴附近脉冲传播的波动理论分析

用射线理论对传统的海洋声层析成像进行了分析。在SOFAR (SOund Fixing and Ranging)轴附近传播的射线波速最慢，并且往往相互重叠，从而形成振幅较大的脉冲。但由于最后一个脉冲在时域上不能单独判别，因此很难用最后一个脉冲进行最终分析。本文利用波动理论在时域上分析了在轴附近传播的末次脉冲。首先，得到最后一个脉冲的振幅随传播距离的变化规律。结果表明，最后一个脉冲是由在SOFAR信道内传播的几个波构成的。然后，将抛物线方程法得到的峰值振幅变化与滤波后的脉冲进行比较，确定最后一个脉冲的波的传播深度范围。最后，给出了最后一个脉冲的峰值振幅图。垂直分布可以用垂直水听器阵列测量。这些结果对今后的海洋声层析成像分析具有重要的指导意义

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)

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