Analysis of vertical line array spatial gain affected by wind-driven ambient noise in deep ocean

2017 ◽  
Author(s):  
Qiulong Yang ◽  
Kunde Yang ◽  
Shaohao Zhu
Keyword(s):  
Ambient Noise ◽  
Deep Ocean ◽  
Vertical Line ◽  
Line Array

scholarly journals Reliable Acoustic Path and Direct-Arrival Zone Spatial Gain Analysis for a Vertical Line Array

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3462 ◽  
Author(s):  
Chunyu Qiu ◽  
Shuqing Ma ◽  
Yu Chen ◽  
Zhou Meng ◽  
Jianfei Wang
Keyword(s):  
Sound Propagation ◽  
Correlation Coefficients ◽  
Deep Ocean ◽  
Vertical Line ◽  
Horizontal Line ◽  
Acoustic Path ◽  
Vertical Arrays ◽  
Peak Structure ◽  
Line Array ◽  
Propagation Properties

A method is developed in this paper to calculate the spatial gain of a vertical line array when the plane-wave assumption is not applicable and when the oceanic ambient noise is correlated. The proposed optimal array gain (OAG), which can evaluate the array’s performance and effectively guide its deployment, can be given by an equation in which the noise gain (NG) is subtracted from the signal gain (SG); hence, a high SG and a negative NG can enhance the performance of the array. OAGs and SGs with different array locations are simulated and analyzed based on the sound propagation properties of the direct-arrival zone (DAZ) and the reliable acoustic path (RAP) using ray theory. SG and NG are related to the correlation coefficients of the signals and noise, respectively, and the vertical correlation is determined by the structures of the multipath arrivals. The SG in the DAZ is always high because there is little difference between the multipath waves, while the SG in the RAP changes with the source-receiver range because of the variety of structure in the multiple arrivals. The SG under different conditions is simulated in this work. The “dual peak” structure can often be observed in the vertical directionality pattern of the noise because of the presence of bottom reflection and deep sound channel. When the directions of the signal and noise are close, the conventional beamformer will enhance the correlation of not only the signals but also the noise; thus, the directivity of the signals and noise are analyzed. Under the condition of having a typical sound speed profile, the OAG in some areas of the DAZ and RAP can achieve high values and even exceed the ideal gain of horizontal line array 10 logN dB, while, in some other areas, it will be lowered because of the influence of the NG. The proposed method of gain analysis can provide analysis methods for vertical arrays in the deep ocean under many conditions with references. The theory and simulation are tested by experimental data.

scholarly journals Striation-based source depth estimation with a vertical line array in the deep ocean

2018 ◽  
Vol 143 (1) ◽  
pp. EL8-EL12 ◽  
Author(s):  
Kunde Yang ◽  
Liya Xu ◽  
Qiulong Yang ◽  
Rui Duan
Keyword(s):  
Deep Ocean ◽  
Depth Estimation ◽  
Vertical Line ◽  
Source Depth ◽  
Line Array

Ambient noise in the Arctic Ocean measured with a drifting vertical line array

2015 ◽  
Vol 138 (3) ◽  
pp. 1744-1744
Author(s):  
Peter F. Worcester ◽  
Matthew A. Dzieciuch ◽  
John A. Colosi
Keyword(s):  
Arctic Ocean ◽  
Ambient Noise ◽  
Vertical Line ◽  
The Arctic ◽  
Line Array ◽  
The Arctic Ocean

Ambient noise in the Arctic Ocean measured with a drifting vertical line array

2014 ◽  
Vol 136 (4) ◽  
pp. 2149-2149
Author(s):  
Peter F. Worcester ◽  
Matthew A. Dzieciuch ◽  
John A. Colosi ◽  
John N. Kemp
Keyword(s):  
Arctic Ocean ◽  
Ambient Noise ◽  
Vertical Line ◽  
The Arctic ◽  
Line Array ◽  
The Arctic Ocean

Comparison of vertical line array data taken at two depths in the deep ocean

1985 ◽  
Vol 77 (S1) ◽  
pp. S70-S71 ◽  
Author(s):  
Mimi Zebrick Lawrence ◽  
Dan J. Ramsdale
Keyword(s):  
Deep Ocean ◽  
Vertical Line ◽  
Array Data ◽  
Line Array

Numerical simulations of compressive beamforming with a vertical line array in the deep ocean

2013 ◽  
Vol 133 (5) ◽  
pp. 3578-3578
Author(s):  
Geoffrey F. Edelmann ◽  
Ian Rooney ◽  
Charles F. Gaumond
Keyword(s):  
Numerical Simulations ◽  
Deep Ocean ◽  
Vertical Line ◽  
Line Array

scholarly journals Vertical line array measurements of ambient noise in the North Pacific

2017 ◽  
Vol 141 (3) ◽  
pp. 1571-1581 ◽  
Author(s):  
Mehdi Farrokhrooz ◽  
Kathleen E. Wage ◽  
Matthew A. Dzieciuch ◽  
Peter F. Worcester
Keyword(s):  
North Pacific ◽  
Ambient Noise ◽  
Vertical Line ◽  
The North ◽  
Array Measurements ◽  
Line Array ◽  
The North Pacific
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