Scripps Institution of Oceanography, La Jolla, California 92093-0238, USA.
J Acoust Soc Am. 2020 Oct;148(4):1800. doi: 10.1121/10.0002103.
A theoretical method for estimating the Green's function between two points in an acoustic waveguide was proposed using a vertical source array that spans sufficient waveguide depth [Roux and Fink, J. Acoust. Soc. Am. 113, 1406-1416 (2003)]. This paper shows that by reversing the role of sources and receivers, the Green's function between two ships (sources) can be extracted using a vertical receiver array with a limited aperture. First, the Green's functions from each ship are estimated along the array via blind deconvolution. Then the Green's function between two ships is obtained by either correlation or convolution of the individual Green's functions summed over the array, depending on the array position with respect to the ships. The feasibility of extracting Green's functions between ships of opportunity radiating random broadband (100-500 Hz) noise is demonstrated using a 56.25-m aperture vertical array in approximately 100-m shallow water.
提出了一种使用垂直声源阵列估计声波导中两点之间格林函数的理论方法，该声源阵列跨越足够的波导深度[Roux 和 Fink，J. Acoust. Soc. Am. 113, 1406-1416（2003）]。本文表明，通过反转源和接收器的作用，可以使用具有有限孔径的垂直接收器阵列提取两艘船（源）之间的格林函数。首先，通过盲反卷积沿阵列估计每个船的格林函数。然后，通过将各个格林函数沿阵列求和的相关或卷积来获得两船之间的格林函数，具体取决于相对于船的阵列位置。使用大约 100 米浅水中的 56.25 米孔径垂直阵列，演示了从辐射随机宽带（100-500 Hz）噪声的机会船之间提取格林函数的可行性。
