Geoacoustic Inversion Using Time Reversal of Ocean Noise

• 来源期刊: 中国物理快报（英文版）
• 关键词: @@
• 年，卷（期）: 2017,（9）
• 页码范围: 62-65
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/34/9/094301

摘要

We present a passive geoacoustic inversion method using two hydrophones,which combines noise interferometry and time reversal mirror (TRM) techniques.Numerical simulations are firstly performed,in which strong focusing occurs in the vicinity of one hydrophone when Green's function (GF) is back-propagated from the other hydrophone,with the position and strength of the focus being sensitive to sound speed and density in the bottom.We next extract the GF from the noise cross-correlation function measured by two hydrophones with 8025-m distance in the Shallow Water'06 experiment.After realizing the TRM process,sound speed and density in the bottom are inverted by optimizing focusing of the back-propagated GF.The passive inversion method is inherently environmentally friendly and low-cost.