Effect of the fluctuant acoustic channel on the gain of a linear array in the ocean waveguide

doi:10.1088/1674-1056/27/11/114301

中国物理B ›› 2018, Vol. 27 ›› Issue (11): 114301-114301.doi: 10.1088/1674-1056/27/11/114301

所属专题： SPECIAL TOPIC — 80th Anniversary of Northwestern Polytechnical University (NPU)

• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇下一篇

Effect of the fluctuant acoustic channel on the gain of a linear array in the ocean waveguide

Lei Xie(谢磊), Chao Sun(孙超), Guang-Yu Jiang(蒋光禹), Xiong-Hou Liu(刘雄厚), De-Zhi Kong(孔德智)

1 Key Laboratory of Ocean Acoustics and Sensing(Ministry of Industry and Information Technology), Northwestern Polytechnical University, Xi'an 710072, China;
2 School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China

收稿日期:2018-07-05 修回日期:2018-08-31 出版日期:2018-11-05 发布日期:2018-11-05
通讯作者: Chao Sun E-mail:csun@nwpu.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11534009).

Effect of the fluctuant acoustic channel on the gain of a linear array in the ocean waveguide

Lei Xie(谢磊)^1,2, Chao Sun(孙超)^1,2, Guang-Yu Jiang(蒋光禹)^1,2, Xiong-Hou Liu(刘雄厚)^1,2, De-Zhi Kong(孔德智)^1,2

1 Key Laboratory of Ocean Acoustics and Sensing(Ministry of Industry and Information Technology), Northwestern Polytechnical University, Xi'an 710072, China;
2 School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China

Received:2018-07-05 Revised:2018-08-31 Online:2018-11-05 Published:2018-11-05
Contact: Chao Sun E-mail:csun@nwpu.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11534009).

摘要/Abstract

摘要：

The inhomogenous ocean waveguide, which leads the amplitude and phase of the signal arriving at a hydrophone array to fluctuate, is one of the causes that make the array gain deviate from its ideal value. The relationship between the array gain and the fluctuant acoustic channel is studied theoretically. The analytical expression of the array gain is derived via an acoustic channel transfer function on the assumption that the ambient noise field is isotropic. The expression is expanded via the Euler formula to give an insight into the effect of the fluctuant acoustic channel on the array gain. The result demonstrates that the amplitude fluctuation of the acoustic channel transfer functions has a slight effect on the array gain; however, the uniformity of the phase difference between the weighting coefficient and the channel transfer function on all the hydrophones in the array is a major factor that leads the array gain to further deviate from its ideal value. The numerical verification is conducted in the downslope waveguide, in which the gain of a horizontal uniform linear array (HLA) with a wide-aperture operating in the continental slope area is considered. Numerical result is consistent with the theoretical analysis.

关键词: acoustic channel fluctuation, array gain, phase difference, downslope

Abstract:

Key words: acoustic channel fluctuation, array gain, phase difference, downslope

中图分类号: (Underwater sound)

43.30.+m

43.60.+d (Acoustic signal processing) 43.60.Fg (Acoustic array systems and processing, beam-forming)

谢磊, 孙超, 蒋光禹, 刘雄厚, 孔德智. Effect of the fluctuant acoustic channel on the gain of a linear array in the ocean waveguide[J]. 中国物理B, 2018, 27(11): 114301-114301.

Lei Xie(谢磊), Chao Sun(孙超), Guang-Yu Jiang(蒋光禹), Xiong-Hou Liu(刘雄厚), De-Zhi Kong(孔德智). Effect of the fluctuant acoustic channel on the gain of a linear array in the ocean waveguide[J]. Chin. Phys. B, 2018, 27(11): 114301-114301.

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Effect of the fluctuant acoustic channel on the gain of a linear array in the ocean waveguide

Effect of the fluctuant acoustic channel on the gain of a linear array in the ocean waveguide

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