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Chin. Phys. B, 2018, Vol. 27(11): 114301    DOI: 10.1088/1674-1056/27/11/114301
Special Issue: SPECIAL TOPIC — 80th Anniversary of Northwestern Polytechnical University (NPU)
SPECIAL TOPIC—80th Anniversary of Northwestern Polytechnical University (NPU) Prev   Next  

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
Abstract  

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.

Keywords:  acoustic channel fluctuation      array gain      phase difference      downslope  
Received:  05 July 2018      Revised:  31 August 2018      Accepted manuscript online: 
PACS:  43.30.+m (Underwater sound)  
  43.60.+d (Acoustic signal processing)  
  43.60.Fg (Acoustic array systems and processing, beam-forming)  
Fund: 

Project supported by the National Natural Science Foundation of China (Grant No. 11534009).

Corresponding Authors:  Chao Sun     E-mail:  csun@nwpu.edu.cn

Cite this article: 

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 2018 Chin. Phys. B 27 114301

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