A source near the deep sound channel axis excites mode groups (or paths) that involve both deep sound channel and boundary interacting propagation. Dispersion from a broadband source as measured on a single hydrophone can be used to estimate source range. Furthermore, modal group speeds have a functional transition when passing through purely refractive to boundary reflecting phase speed regions which, under certain conditions, provides additional arrival structure to aid in source localization. This additional arrival structure is in the form of a focal region in a spectrogram. Indeed, different data sets from the Acoustic Thermometry of the Ocean Climate (ATOC) Program [ATOC Consortium, Science 281, 1327-1332 (1998)] show that localization can be accomplished using this focal region and/or the overall dispersion properties as originally suggested fifty years ago [M. Ewing and J. L. Worzel, Geo. Soc. Am., Memoir 27 (1948)].
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机译：靠近深声道通道轴的源会激发涉及深声道和边界相互作用传播的模式组（或路径）。在单个水听器上测得的宽带信号源的色散可用于估算信号源范围。此外，模态群速度在通过纯折射到边界反射相速度区域时会发生功能转换，在某些条件下，它会提供附加的到达结构以帮助进行源定位。这种额外的到达结构采用频谱图中焦点区域的形式。实际上，来自海洋气候声学测温计划（ATOC）的不同数据集[ATOC联盟，科学281，1327-1332（1998）]显示，可以像最初那样使用此焦点区域和/或整体色散特性来完成定位建议五十年前[M. Ewing和J. L. Worzel，Geo。 Soc。 ，回忆录27（1948）]。
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