Accession Number:
ADA276741
Title:
Prediction of the Plane Wave Beamformed Acoustic Arrival Structure for the 1992 Barents Sea Coastal Tomography Test
Descriptive Note:
Master's thesis
Corporate Author:
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s):
Report Date:
1993-12-01
Pagination or Media Count:
48.0
Abstract:
In an effort to solve the forward propagation problem associated with the 1992 Barents Sea Polar Front Experiment Tomography Test, the transmission of a 224 Hz pulse signal from a near bottom sound source to a vertical hydrophone array was simulated based on three-dimensional ray theory. based on three- dimensional ray theory. Through numerical raytracing, followed by eigenray searches and estimations of ray amplitudes, searches and estimations of ray amplitudes, phases and travel times, the arrival structure as a function of time and elevation angle was constructed. The simulation was performed for both a two-dimensional and three-dimensional modeled ocean environment in order to examine the significance of three-dimensional effects. The predicted arrival structures compare well with the observed data. Three-dimensional effects proved to be significant only for the latest arrivals. Tomography, Eigenray, Plane wave, Beamformed.
Descriptors:
- *COASTAL REGIONS
- *EIGENVALUES
- *HYDROPHONES
- *ACOUSTIC DATA
- *BARENTS SEA
- TEST AND EVALUATION
- SIMULATION
- THREE DIMENSIONAL
- BATHYMETRY
- PULSES
- SIGNALS
- SOUND
- WATER MASSES
- OCEAN ENVIRONMENTS
- UNDERWATER ACOUSTICS
- RAY TRACING
- AMPLITUDE
- ARRIVAL
- ACOUSTIC SCATTERING
- ELEVATION
- TOMOGRAPHY
- BOTTOM LOSS
- TRAVEL TIME
- PLANE WAVES
- ACOUSTIC ARRAYS
- WAVE PROPAGATION
- MASS FLOW
- SHALLOW WATER
- ARRAYS
- TWO DIMENSIONAL
- ANGLES
Subject Categories:
- Physical and Dynamic Oceanography
- Acoustic Detection and Detectors
- Acoustics