A harmonic noise model for direction finding in colored ambient noise

1995 ◽  
Vol 2 (7) ◽  
pp. 135-137 ◽  
Author(s):  
F. Vanpoucke ◽  
A. Paulraj
Keyword(s):  
Ambient Noise ◽  
Direction Finding ◽  
Noise Model ◽  
Harmonic Noise

scholarly journals A two‐component Arctic ambient noise model

1992 ◽  
Vol 92 (4) ◽  
pp. 2343-2343
Author(s):  
Michael V. Greening ◽  
Pierre Zakarauskas
Keyword(s):  
Ambient Noise ◽  
Noise Model ◽  
Two Component

COMPUTATION OF NOISE DIRECTIONALITY, COHERENCE AND ARRAY RESPONSE IN RANGE DEPENDENT MEDIA WITH CANARY

2001 ◽  
Vol 09 (02) ◽  
pp. 327-345 ◽  
Author(s):  
C. H. HARRISON ◽  
R. BRIND ◽  
A. COWLEY
Keyword(s):  
Analytical Solutions ◽  
Ambient Noise ◽  
Numerical Algorithms ◽  
Noise Model ◽  
Test Cases ◽  
Noise Sources ◽  
Source Density ◽  
Or Groups

The ambient noise model CANARY calculates noise coherence and array noise response by treating the noise sources as surface distributions rather than points. This assumption leads to simplification of the propagation, even in range-dependent environments, and by allowing variations in the source density one can represent distant storms or groups of ships. Included is a description of the numerical algorithms used to calculate coherence. Some recently developed analytical solutions for uniform source distributions and uniformly sloping seabed3 are used as test cases for CANARY. Some additional examples demonstrate CANARY's performance in more realistic environments and conditions including wind and shipping sources, and comparisons are made with the noise model RANDI.

scholarly journals Noise Model Analysis and Estimation of Effect due to Wind Driven Ambient Noise in Shallow Water

2011 ◽  
Vol 2011 ◽  
pp. 1-4 ◽  
Author(s):  
S. Sakthivel Murugan ◽  
V. Natarajan ◽  
R. Rajesh Kumar
Keyword(s):  
Wind Speed ◽  
Marine Mammals ◽  
Ambient Noise ◽  
Signal Transmission ◽  
Acoustic Signals ◽  
Noise Spectrum ◽  
Noise Model ◽  
Frequency Range ◽  
Entire Frequency Range ◽  
Wind Speeds

Signal transmission in ocean using water as a channel is a challenging process due to attenuation, spreading, reverberation, absorption, and so forth, apart from the contribution of acoustic signals due to ambient noises. Ambient noises in sea are of two types: manmade (shipping, aircraft over the sea, motor on boat, etc.) and natural (rain, wind, seismic, etc.), apart from marine mammals and phytoplanktons. Since wind exists in all places and at all time: its effect plays a major role. Hence, in this paper, we concentrate on estimating the effects of wind. Seven sets of data with various wind speeds ranging from 2.11 m/s to 6.57 m/s were used. The analysis is performed for frequencies ranging from 100 Hz to 8 kHz. It is found that a linear relationship between noise spectrum and wind speed exists for the entire frequency range. Further, we developed a noise model for analyzing the noise level. The results of the empirical data are found to fit with results obtained with the aid of noise model.

scholarly journals Ocean ambient noise model considering depth distribution of source and geo-acoustic inversion

2017 ◽  
Vol 66 (1) ◽  
pp. 014306
Author(s):  
Jiang Peng-Fei ◽  
Lin Jian-Heng ◽  
Sun Jun-Ping ◽  
Yi Xue-Juan
Keyword(s):  
Ambient Noise ◽  
Depth Distribution ◽  
Noise Model ◽  
Acoustic Inversion
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