Bonnel Julien, Lin Ying-Tsong, Eleftherakis Dimitrios, Goff John A, Dosso Stan, Chapman Ross, Miller James H, Potty Gopu R
Applied Ocean Physics and Engineering Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA.
Laboratoire des Sciences et Techniques de l'Information, de la Communication Ecole Nationale Supérieure de Techniques Avancées, Bretagne, 29200 Brest, France.
J Acoust Soc Am. 2018 May;143(5):EL405. doi: 10.1121/1.5039769.
This paper presents single receiver geoacoustic inversion of a combustive sound source signal, recorded during the 2017 Seabed Characterization Experiment on the New England Mud Patch, in an area where water depth is around 70 m. There are two important features in this study. First, it is shown that high-order modes can be resolved and estimated using warping (up to mode number 18 over the frequency band 20-440 Hz). However, it is not possible to determine mode numbers from the data, so that classical inversion methods that require mode identification cannot be applied. To solve this issue, an inversion algorithm that jointly estimates geoacoustic properties and identifies mode number is proposed. It is successfully applied on a range-dependent track, and provides a reliable range-average estimation of geoacoustic properties of the mud layer, an important feature of the seabed on the experimental area.
本文介绍了在2017年新英格兰泥滩海底特性实验期间，在水深约70米的区域记录的燃烧声源信号的单接收器地声反演。本研究有两个重要特点。首先，研究表明，使用频率规整可以分辨和估计高阶模式（在20-440赫兹频段内可达第18阶模式）。然而，无法从数据中确定模式阶数，因此无法应用需要模式识别的经典反演方法。为了解决这个问题，提出了一种联合估计地声特性并识别模式阶数的反演算法。该算法成功应用于距离相关轨迹，并提供了泥层地声特性的可靠距离平均估计，这是实验区域海底的一个重要特征。
