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A hybrid scheme for geoacoustic inversion
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  • 分类:TN124[电子电信—物理电子学] P315[天文地球—地震学;天文地球—固体地球物理学;天文地球—地球物理学]
  • 作者机构:[1]National Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Beijing 100190, [2]Graduate University of Chinese Academy of Sciences Beijing 100190, [3]Research institute of TV and Electro-Acoustics Beijing 100015, [4]Haikou Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Haikou 570105
  • 相关基金:This work was supported by by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX1-YW-12-2) and the National Natural Science Foundation of China (10974218 and 10734100).5 Acknowledgments The author wished to thank to all the participants in the 2005's and 2006's experiments
  • 相关项目:海洋声场时间、频率与空间相干特性及其应用
中文摘要:

geoacoustic 参数的一个混合倒置计划,把正常模式的分散特征与传播损失相结合,基于事实被建议了不同参数在健全的地上有不同效果。首先,就正常的分散特征而言,模式对密度和 seabottom 的健全速度敏感,并且对 seabottom 变细系数,不同模式的组时间延期和不同频率不敏感通过适应的最佳的核 timefrequency 表示被获得,然后,组时间延期作为费用功能被拿,并且使用一个全球最佳的算法, seabottom 密度和 seabottom 声音的侧面速度被推出。连续地,倒置结果的有效性被评估由 posteriori 可能性。最后,沉积的变细系数用从轮船放射噪音记录的传播损失数据被转换。全部的倒置结果的有效性被使用处理来源本地化的匹配的地评估了。

英文摘要:

A hybrid inversion scheme of geoacoustic parameters, which combines dispersion characteristics of normal modes with transmission loss, has been proposed based on the facts that different parameters have different effects on sound field. First, considering the dispersion characteristics of normal modes were sensitive to the density and the sound speed of seabottom, and not sensitive to the seabottom attenuation coefficient, the group time delays of different modes and different frequencies were acquired through adaptive optimal kernel time-frequency representation, then the group time delays were taken as the cost function, and using a global optimal algorithm, the seabottom density and the profile of seabottom sound speed were deduced. Successively, the validity of inversion results was evaluated by the a posteriori probability. Last, the attenuation coefficient of sediment is inverted using the transmission loss data recorded from the ship radiation noise. The validity of the total inversion results has been evaluated by making use of the matched field processing source localization.

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