Title :
How biological (fish) noise affects the performance of shallow water passive array system
Author :
Fernandes, William ; Chakraborty, Bishwajit ; Haris, K. ; Vijaykumar, K. ; Sundar, D. ; Luis, R.A.A. ; Mahanty, M.M. ; Latha, G.
Author_Institution :
Nat. Inst. of Oceanogr., Dona Paula, India
Abstract :
Passive acoustic data off Grand Island, Goa were acquired using a single wideband hydrophone system deployed at the water depth of ~20.5 m during the month of April, 2014. The 4- elements hydrophone array with an aperture of 1.5 m having design frequency equivalent to 1.5 kHz was also moored at 10 m below the water surface. The analyses carried out reveals fish chorus belonging to the family Terapontidae. Significant beam-pattern degradation was observed particularly in the presence of fish chorus using delay and sum beamforming. Spatially interpolated virtual hydrophone element enhancement provides improved beamforming even in the presence of fish choruses.
Keywords :
acoustic arrays; acoustic noise; acoustic signal processing; array signal processing; hydrophones; underwater sound; 4-element hydrophone array; Terapontidae family; beam-pattern degradation; biological noise; fish chorus; fish noise; passive acoustic data off Grand Island; shallow water passive array system; single wideband hydrophone system; spatially interpolated virtual hydrophone element; sum beamforming; water surface; Acoustics; Arrays; Marine animals; Noise; Sonar equipment; Spectrogram; beamforming; fish noise; hydrophone array; passive sonar;
Conference_Titel :
Underwater Technology (UT), 2015 IEEE
Conference_Location :
Chennai
Print_ISBN :
978-1-4799-8299-8
DOI :
10.1109/UT.2015.7108278
