Gerstoft Peter, Hodgkiss William S, Siderius Martin, Huang Chen-Fen, Harrison Chris H
Marine Physical Laboratory, Scripps Institution of Oceanography, La Jolla, California 92093-0238, USA.
J Acoust Soc Am. 2008 Mar;123(3):1297-305. doi: 10.1121/1.2831930.
Ocean acoustic noise can be processed efficiently to extract Green's function information between two receivers. By using noise array-processing techniques, it has been demonstrated that a passive array can be used as a fathometer [Siderius, et al., J. Acoust. Soc. Am. 120, 1315-1323 (2006)]. Here, this approach is derived in both frequency and time domains and the output corresponds to the reflection sequence. From this reflection sequence, it is possible to extract seabed layering. In the ocean waveguide, most of the energy is horizontally propagating, whereas the bottom information is contained in the vertically propagating noise. Extracting the seabed information requires a dense array, since the resolution of the bottom layer is about half the array spacing. If velocity sensors are used instead of pressure sensors, the array spacing requirement can be relaxed and simulations show that just one vertical velocity sensor is sufficient.
海洋声学噪声可以被有效地处理，以提取两个接收器之间的格林函数信息。通过使用噪声阵列处理技术，已经证明无源阵列可以用作测深仪[西迪厄斯等人，《美国声学学会杂志》120，1315 - 1323(2006)]。这里，这种方法在频域和时域中都有推导，并且输出对应于反射序列。从这个反射序列中，可以提取海底分层信息。在海洋波导中，大部分能量是水平传播的，而底部信息包含在垂直传播的噪声中。提取海底信息需要一个密集阵列，因为底层的分辨率大约是阵列间距的一半。如果使用速度传感器而不是压力传感器，对阵列间距的要求可以放宽，并且模拟表明仅一个垂直速度传感器就足够了。
