物理学报Issue(17)：1-9,9.DOI:10.7498/aps.64.174302
一种基于简正波模态频散的远距离宽带海底参数反演方法∗
A far distance wideband geoacoustic parameter inversion metho d based on a mo dal disp ersion curve
摘要
Abstract
Acoustic propagation in shallow water is greatly influenced by the properties of the sea bottom. The dispersion characteristics of modes are relatively sensitive to the bottom parameters and have been used to invert the bottom parameters. Since the inversion error using a single wideband sound source increases with increasing range, a far distance inversion method based on the modal dispersion curve using a single hydrophone with two wideband sound sources is presented in this paper, in which a warping transform is applied so that it can accurately extract the modal dispersion curve from the warped signal spectrum. Experimental data used for the inversion are acquired using a hydrophone of vertical array in the South Sea of China during the Autumn in 2012. The transmitted signals are explosive signals, and the bottom sound speed and density are inverted by matching the theoretical arrival time differences of various modes and frequencies with those calculated using the experimental data. The attenuation coefficient is deduced using the transmission loss data recorded in the experiment. A genetic algorithm (GA) is used for optimization search for the parameter bounds. Inversion results demonstrate that the arrival time difference when using the bottom sound speed and density show a high consistency with those obtained using the experimental data. Moreover, the attenuation coefficient is nonlinear over the frequency band from 100 to 315 Hz. The validity of inverted parameters is evaluated by the posteriori probability distributions, and the numerical results of arrival time differences calculated using the inverted sound speed and density are in good agreement with those extracted from the other two wideband explosive signals at different distances. In addition, the theoretical transmission loss calculated using the inverted attenuation coefficient matches the experiment data very well. It is shown that the inversion scheme can provide a valid and stable environmental estimation.关键词
地声反演/两个宽带爆炸声源/模态频散/传播损失Key words
geoacoustic inversion/two wideband explosive signals/modal dispersion/transmission loss引用本文复制引用
..一种基于简正波模态频散的远距离宽带海底参数反演方法∗[J].物理学报,2015,(17):1-9,9.基金项目
国家自然科学基金(批准号:11174235)和中央高校基本科研业务费专项资金(批准号:3102014JC02010301)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant No.11174235), and the Fundamental Research Funds for the central Universities of Ministry of Education of China (Grant No.3102014JC02010301) （批准号:11174235）
