Prediction of the Plane Wave Beamformed Acoustic Arrival Structure for the 1992 Barents Sea Coastal Tomography Test

• Main Author: Mykyta, John L.
• Other Authors: NAVAL POSTGRADUATE SCHOOL MONTEREY CA
• Format: Text
• Language: English
• Published: 1993
• Subjects: Physical and Dynamic Oceanography; Acoustic Detection and Detectors; Acoustics; *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; Barents Sea
• Online Access: http://www.dtic.mil/docs/citations/ADA276741; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA276741

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.