Song H C, Cho Chomgun, Byun Gihoon, Kim J S
Scripps Institution of Oceanography, La Jolla, California 92093-0238, USA.
Korea Maritime and Ocean University, Busan, 606-791, South Korea.
J Acoust Soc Am. 2017 May;141(5):3270. doi: 10.1121/1.4983303.
The array invariant proposed for robust source localization in shallow water is based on the dispersion characteristics in ideal waveguides. It involves conventional plane-wave beamforming using a vertical array, exploiting multiple arrivals separated in beam angle and travel time, i.e., beam-time migration. The approach typically requires either a short pulse emitted by a source or the Green's function that can be estimated from a probe signal to resolve distinct multipath arrivals. In this letter, the array invariant method is extended to unknown source waveforms by extracting the Green's function via blind deconvolution. The cascade of blind deconvolution and array invariant for robust source-range estimation is demonstrated using a 16-element, 56-m long vertical array at various ranges (1.5-3.5 km) from a towed source broadcasting broadband communication waveforms (0.5-2 kHz) in approximately 100-m deep shallow water.
为实现浅水中稳健的源定位而提出的阵列不变量是基于理想波导中的色散特性。它涉及使用垂直阵列的传统平面波波束形成，利用在波束角度和传播时间上分离的多个到达信号，即波束时间偏移。该方法通常需要源发射的短脉冲或可从探测信号估计的格林函数，以分辨不同的多径到达信号。在本文中，通过盲反卷积提取格林函数，将阵列不变量方法扩展到未知源波形。使用一个16元、56米长的垂直阵列，在距离拖曳源1.5至3.5千米的不同距离处，对广播0.5至2千赫宽带通信波形的拖曳源，在大约100米深的浅水中进行了盲反卷积和阵列不变量级联以实现稳健的源距离估计的演示。
