Tan Tsu Wei, Godin Oleg A, Brown Michael G, Zabotin Nikolay A
Department of Physics, Naval Postgraduate School, 833 Dyer Road, Monterey, California 93943-5216, USA.
Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, 4600 Rickenbacker Causeway, Miami, Florida 33149, USA.
J Acoust Soc Am. 2019 Oct;146(4):2321. doi: 10.1121/1.5127846.
Interferometry of ambient and shipping noise in the ocean provides a way to estimate physical parameters of the seafloor and the water column in an environmentally friendly manner without employing any controlled sound sources. With noise interferometry, two-point cross-correlation functions of noise serve as the probing signals and replace the Green's function measured in active acoustic remote sensing. The amount of environmental information that can be obtained with passive remote sensing and the robustness of the estimates of the seafloor parameters increase when contributions of individual normal modes are resolved in the noise cross-correlation function. Using the data obtained in the 2012 noise-interferometry experiment in the Straits of Florida, dispersion curves of the first four normal modes are obtained in this paper by application of the time-warping transform to noise cross correlations. The passively measured dispersion curves are inverted for unknown geoacoustic properties of the seabed. Resulting thickness of the sediment layer and sound speed are consistent with the geoacoustic models obtained earlier by other means.
对海洋环境噪声和船舶噪声进行干涉测量，提供了一种以环保方式估算海底和水柱物理参数的方法，无需使用任何受控声源。利用噪声干涉测量法，噪声的两点互相关函数用作探测信号，取代了有源声学遥感中测量的格林函数。当在噪声互相关函数中分辨出各个简正模式的贡献时，通过被动遥感可获得的环境信息量以及海底参数估计的稳健性都会增加。利用2012年在佛罗里达海峡进行的噪声干涉测量实验所获得的数据，本文通过对噪声互相关应用时间规整变换，得到了前四个简正模式的频散曲线。对被动测量的频散曲线进行反演，以获取未知的海底地球声学特性。所得沉积层厚度和声速与先前通过其他方法获得的地球声学模型一致。
