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首页> 外文会议>OCEANS >Subseafloor geoacoustic characterization in the kilohertz regime with a broadband source and a 4-element receiver array
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Subseafloor geoacoustic characterization in the kilohertz regime with a broadband source and a 4-element receiver array

机译：具有宽带源的千赫兹制度的海底地理声学特性和4元件接收器阵列

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摘要

Maritime Rapid Environmental Assessment experiments (MREA/BP'07) were carried out southeast of the island of Elba in the Mediterranean Sea in the spring of 2007 with the aim to produce an integrated 4D (3-dimensional space and time) picture of that shallow water environment. Several standard and advanced techniques of environmental characterization covering the fields of underwater acoustics, physical oceanography and geophysics were combined within a coherent scheme of data acquisition, processing and assimilation. This paper focuses on a technique developed for the rapid 3D geoacoustic characterization of the subseafloor via ldquorange-independent inversionrdquo runs in subareas predetermined on the basis of geological ground truth and an initial hydrographic and geophysical survey. The technique uses a broadband source with 1.2-kHz center frequency, a drifting vertical array of four 5-m spaced, model-based matched filter (MBMF) processing and Bayesian inversion. Experimental results are in excellent agreement with earlier Yellow Shark sparse-array results in the same area demonstrating the feasibility of using the fully-coherent MBMF processing at higher frequencies (0.85-1.55 kHz) and shorter ranges (1-2 km), and therefore lighter instrumentation that is easily deployed by hand from a small high-speed boat or mounted on a remotely operated or autonomous underwater vehicles.
机译：海事快速环境评估实验（MREA / BP'07）进行了在地中海的厄尔巴岛的东南在2007年的春天，目的是产生一个集成的4D（三维空间和时间）浅的图片水环境。几种标准和环境表征的先进技术覆盖水下声学，物理海洋学和地球物理学的领域合并数据采集的相干方案中，加工和同化。本文的重点为海床下的通过在规定的地质地面实况的基础和初始水文和地球物理勘测上分区ldquorange无关inversionrdquo运行的快速3D地声学鉴定开发的技术。该技术使用宽带光源用1.2千赫的中心频率，4个5米间隔的，基于模型的匹配滤波器（MBMF）处理和贝叶斯反转的漂流垂直阵列。实验结果非常一致，在相同的区域证明使用完全相干MBMF处理在更高的频率（0.85-1.55 kHz）和更短的范围内（1-2公里）的可行性更早黄鲨鱼稀疏阵列的结果，并且因此打火机的仪器，很容易用手部署从一个小高速船或安装在远程操作或自主水下车辆。

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