Song H C, Byun Gihoon
Scripps Institution of Oceanography, La Jolla, California 92093-0238, USA.
J Acoust Soc Am. 2021 Apr;149(4):2173. doi: 10.1121/10.0003957.
A method is presented for estimating the range of a distant ship in shallow water using a vertical array and a guide ship at a known range close to the array. The method involves a combination of four different approaches: blind deconvolution, waveguide invariant, virtual receiver (VR), and array invariant. (1) Blind deconvolution extracts a time-domain Green's function from the broadband acoustic source (guide ship). (2) The Green's function is extrapolated into adjacent ranges using the waveguide invariant, generating a horizontal array of synthetic guide sources. (3) Each guide source then turns into a VR where the output approximates the signal that the distant (objective) ship will produce at the location of the guide source. (4) The horizontal virtual array around the guide ship applies the blind deconvolution again to estimate the Green's function for the objective source, followed by the array invariant to estimate the distance between the two ships. The proposed method is demonstrated using a ship of opportunity radiating broadband noise (100-500 Hz) and a 56.25-m long vertical array in approximately 100-m water.
本文提出了一种利用垂直阵列和一艘位于靠近该阵列已知距离处的导船来估计浅水中远距离船舶距离的方法。该方法涉及四种不同方法的组合：盲反卷积、波导不变量、虚拟接收器（VR）和阵列不变量。（1）盲反卷积从宽带声源（导船）中提取时域格林函数。（2）利用波导不变量将格林函数外推到相邻距离，生成合成导源的水平阵列。（3）然后每个导源转变为一个虚拟接收器，其输出近似于远距离（目标）船舶在导源位置处将产生的信号。（4）围绕导船的水平虚拟阵列再次应用盲反卷积来估计目标源的格林函数，随后利用阵列不变量来估计两艘船舶之间的距离。使用一艘辐射宽带噪声（100 - 500Hz）的机会船和一个在约100米深水中的56.25米长垂直阵列对所提出的方法进行了演示。
