三维海洋波导中散射目标快速声学远场成像

Fast Acoustic Far-field Inverse of Three-dimensional Scattering Objects in an Ocean Waveguide

研究用声传播远场分布信息成像海洋波导环境中三维散射目标的反问题,提出一种指示器样本成像方法,在不需要预先知道散射目标的任何声学和几何特性的情况下,可以快速得到其位置、形状等几何信息的一个理想的像.数值试验表明,该方法对成像海洋波导中三维散射目标是有效的,即使在有限孔径测量方式和具有噪声测量数据时,也能够得到散射目标的一个理想成像,表明海洋波导边界的多重反射效应对成像效果具有一定的正面影响.

We study an inverse problem of reconstructing a 3D object in an ocean waveguide from far-field measurements of scattered field. An indicator sampling method for fast imaging of scattering object is presented. The method does not depend on any acoustic and geometric properties of the scattering object. It is valid for obtaining good imaging of location and shape of the scattering object, even as far-field data are measured in a limited aperture and corrupted by noise. Generally, multiple scattering between object and waveguide boundaries has positive influence on reconstruction of the scattering object.