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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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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 "range-independent inversion" 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：海上快速环境评估实验（MREA / BP'07）于2007年春天在地中海的Elba岛东南部进行，目的是产生浅薄的综合4D（三维空间和时间）图片水环境。覆盖水下声学，物理海洋学和地球物理领域的几种标准和高级环境表征技术在数据采集，加工和同化的一致方案中合并。本文重点介绍了在基于地质地理实践的基于地质实践和初始水文和地球物理调查的蛛网中的“互相反转”通过“无关的反转”，对外部面板的快速3D地理声学表征开发的技术。该技术采用宽带源具有1.2 kHz中心频率，漂移垂直阵列的四个5-M间距，基于模型的匹配滤波器（MBMF）处理和贝叶斯反演。实验结果与早期的黄色鲨鱼稀疏阵列非常一致，同一区域的结果表明使用较高频率（0.85-1.55 kHz）和更短的范围（1-2公里）的完全相干MBMF处理的可行性。因此较轻的仪器，通过手动从小的高速船只展开或安装在远程操作或自动水下车辆上。

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