Kim Kyungseop, Seong Woojae, Lee Keunhwa, Kim Seongil, Shim Taebo
Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, Korea.
J Acoust Soc Am. 2009 Feb;125(2):735-45. doi: 10.1121/1.3056551.
This paper describes the results of range-dependent geoacoustic inversion using vertical line array data obtained from the 4th Matched Acoustic Properties and Localization Experiment conducted in the East Sea of Korea. The narrowband multitone continuous-wave signal from the towed source was analyzed to estimate the range-dependent geoacoustic properties along the radial track. The primary approach is based on the sectorwise inversion scheme. The inversion region up to 7.5 km from the vertical line array was divided into several segments, and the subinversions for each segment were performed sequentially. To reduce the dominance of low-angle arrivals, which bears little information for the bottom segment in question, matched beam processing with beam filtering was used for the cost function. The performance of proposed algorithm was tested using simulated data for an environment representative of the experimental site. The inversion results for the experimental data were consistent with the geophysical database and were validated from matched-field source localization using frequencies different from those used in the inversion.
本文描述了利用在韩国东海进行的第四次声学特性匹配与定位实验所获得的垂直线列阵数据进行距离相关地声反演的结果。对拖曳声源发出的窄带多音连续波信号进行分析，以估计沿径向轨迹的距离相关地声特性。主要方法基于扇形反演方案。将距垂直线列阵7.5公里以内的反演区域划分为若干段，并依次对每段进行子反演。为了减少低角度波至的主导性（低角度波至对所讨论的海底段信息量很少），在代价函数中使用了带波束滤波的匹配波束处理。利用代表实验场地环境的模拟数据对所提算法的性能进行了测试。实验数据的反演结果与地球物理数据库一致，并通过使用与反演中不同的频率进行匹配场源定位得到了验证。
