LOW-FREQUENCY ACOUSTIC VECTOR FIELD STABILITY IN THE PRESENCE OF ENVIRONMENTAL VARIABILITY
Laksana, Fahmi Chandra
Smith, Kevin B.
Joseph, John E.
MetadataShow full item record
The Department of Physics at the Naval Postgraduate School recently collected data from a low-frequency vector sensor system off the coast of Big Sur, California, in May 2018. During the test, signals from numerous surface craft were recorded. In this study, a numerical model was employed to estimate the vector field transmission loss at low frequency in order to estimate performance of the system during the test. In order to provide realistic ranges of values, the impact of environmental variability was examined and the primary factors affecting transmission loss were identified. The range-dependent environmental features included varying bathymetry as well as a rough pressure release surface that can predict the effects of rough surface scattering. During the field test, sound speed profile measurements were made, and surface wave buoy data was collected that provided realistic estimates of these features in the vicinity of the sensor system. Various geoacoustic bottom parameters were modeled in order to estimate the potential variability in transmission loss levels due to uncertainty in bottom type. Finally, models of merchant ship source levels were combined with the range of transmission loss predictions to develop estimates for received levels on the vector sensor system during the test. These estimates will then provide a guide during the post-processing of the data collected and may lead to improvements in source level modeling.
Approved for public release. distribution is unlimited
Showing items related by title, author, creator and subject.
Pinto, Renato Lima (Monterey, California. Naval Postgraduate School, 1998-03);With the recent conflict in Bosnia-Herzegovina being in the world news front, the Adriatic Sea has become an important strategic operating area for the North Atlantic Treaty Organization (NATO) and for the U.S. Navy. The ...
Investigation of acoustic vector sensor data processing in the presence of highly variable bathymetry Kubisak, Timothy D. (Monterey, California: Naval Postgraduate School, 2014-06);Data has been collected on acoustic vector sensors mounted on autonomous underwater gliders in the Monterey Bay during 2012–2013. Previous processing work computed the acoustic vector intensity to estimate bearing to ...
An examination of the ability of ocean obervatory systems to determine merchant ship direction and draft Hunt, Richard S. (Monterey, California: Naval Postgraduate School, 2013-09);The objective of this thesis was to analyze data obtained from a network of Ocean Bottom Seismometers to determine if it could be used to provide detailed information regarding merchant vessels such as their direction and ...