Coherent processing of shipping noise for ocean monitoring.
Ambient noise was recorded on two vertical line arrays (VLAs) separated by 450 m and deployed in shallow water (depth ~150 m) off San Diego, CA continuously for 6 days. Recordings were dominated by non-stationary and non-uniform broadband shipping noise (250 Hz to 1.5 kHz). Stable coherent noise wavefronts were extracted from ambient noise correlations between the VLAs during all 6 days by mitigating the effect of discrete shipping events and using array beamforming with data-derived steering vectors. This procedure allows the tracking of arrival-time variations of these coherent wavefronts during 6 days and may help in developing future passive acoustic tomography systems.
School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, USA. lani.shane@gatech.edu
Shane W
SW
Lani
Karim G
KG
Sabra
William S
WS
Hodgkiss
W A
WA
Kuperman
Philippe
P
Roux
D000162:Acoustics / Q000295:instrumentation; D004784:Environmental Monitoring / Q000379:methods*; D005583:Fourier Analysis; D008962:Models, Theoretical; D009038:Motion; D009624:Noise, Transportation; D009792:Oceans and Seas; D012767:Ships; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors