Diurnal Variability of Underwater Acoustic Noise Characteristics in Shallow Water
Abstract: The biggest
challenge in the underwater communication and target locating is to reduce the
effect of underwater acoustic noise (UWAN). An experimental model is presented
in this paper for the diurnal variability of UWAN of the acoustic underwater
channel in tropical shallow water. Different segments of data are measured
diurnally at various depths located in the Tanjung Balau, Johor, Malaysia. Most
applications assume that the noise is white and Gaussian. However, the UWAN is
not just thermal noise but a combination of turbulence, shipping and wind
noises. Thus, it is appropriate to assume UWAN ascolored rather than white
noise. Site-specific noise, especially in shallow water often contains
significantnon-Gaussian components. The real-time noise segments are analyzed
to determine the statisticalproperties such as power spectral density (PSD),
autocorrelation function and probability density function (pdf). The results
show the UWAN has a non-Gaussian pdf and is colored. Moreover, the difference
in UWAN characteristics between day and night is studied and the noise power at
night is found to be more than at the day time by around (3-8dB).
Author: Yasin Yousif Al-Aboosi
Journal Code: jptkomputergg170140
