Browsing Technical Reports by Title
Now showing items 171-190 of 322
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Mode and PE predictions of propagation in range-dependent environments: SWAM'99 workshop results
(NATO. SACLANTCEN, 2000/05)Three numerical acoustic models, a coupled normal-mode model (C-SNAP), -
Model statistics of inertial shear from multi- year simulations at weathership 'Mike': currents, atmospheric forcing, internal waves, mixed layer, Norwegian Sea)
(NATO. SACLANTCEN, 1990/12)In this memorandum we focus on one of the most important environmental -
Modeling non-Rayleigh reverberation
(NATO. SACLANTCEN, 1997/05)Researchers over the past three decades have experimentally examined non-Rayleigh reverberation, -
Modelling acousto-elastic waveguide/object scattering with the Rayleigh hypothesis
(NATO. SACLANTCEN, 1998/06)In this memorandum the plane wave scattering matrices for a range-dependent seabed and upper free surface are computed using the -
Modelling of scattering by objects on the seabed
(NATO. SACLANTCEN, 1997/12)This paper describes some of the theory and implementation issues of modeling the backscattered -
Modelling of scattering by partially buried elastic cylinders
(NATO. SACLANTCEN, 1998/02)The work of a previous memorandum on the modelling of scattering by a partially buried cylinder is extended to allow the cylinder to have full elasticity (and not just be a fluid structure as in the previous work). The ... -
Modelling scattering from partially buried cylinders = Acoustic scattering from cylindrical objects embedded between two half-spaces/The computation of the scattered pressure field from a cylinder embedded between two half-spaces = The computation of the scattered pressure field from a cylinder embedded between two half-spaces with different densities
(NATO. SACLANTCEN, 1996/12)1. A boundary integral equation method is presented for the computation of the acoustic field scattered from a cylindrical object which is totally within the water column, totally buried in sediment, or partially buried. ... -
Multiple beamforming
(NATO. SACLANTCEN, 1985/07)Beamforming techniques are generally based on the assumption that the received signal arrives from -
Multiple view sidescan sonar
(NATO. SACLANTCEN, 1995/12)The classification of objects on the seafloor by means of a sonar can be -
NATO Undersea Research Centre human diver and marine mammal risk mitigation rules and procedures
(NURC, 2006/09)The NATO Marine Mammal Risk Mitigation project has as its goals the development of risk mitigation protocols, computer tools, and in-water devices to provide risk mitigation before sonar or other noisy experiments and naval ... -
NATO Undersea Research Centre marine mammal risk mitigation rules and procedures
(NURC, 2009/11)The NATO Undersea Research Centre (NURC) Marine Mammal Risk Mitigation Rules and Procedures provides the policy and the procedures to scientific planners, Scientists-in-Charge (SIC), researchers and the Masters of NURC ... -
NATO Undersea Research Centre marine mammal risk mitigation rules and procedures
(NURC, 2008/12)The goals of the NATO Marine Mammal Risk Mitigation include the development of risk mitigation protocols, computer tools, and in-water devices to provide risk mitigation before sonar experiments so to avoid potential ... -
New mechanical equipment for handling oceanographic cables
(NATO. SACLANTCEN, 1964/04)The four pieces of equipment described in this report have been designed to facilitate the handling of oceanographic cables by replacing the heavy, and often expensive, equipment at present in use, with lighter, less ... -
Noise measurements during MAPEX 2000
(NATO. SACLANTCEN, 2002/03)During MAPEX2000 some simultaneous ambient noise measurements with an HLA and satellite SAR images were collected. The aim was to predict shipping and wind noise from the satellite radar and to compare results with acoustic ... -
Nowcasting and forecasting of sound velocity structure by ocean modelling
(NATO. SACLANTCEN, 1999/04)The Harvard Ocean Prediction System (HOPS) is applied to an observed oceanographic data set in -
Numerical simulation of the effects of bathymetry on underwater sound propagation using three-dimensional parabolic models
(NATO. SACLANTCEN, 1998/03)Two different three-dimensional parabolic equation (PE) methods are -
Observations of Mediterranean flow into the Black Sea
(NATO. SACLANTCEN, 1997/10)Mediterranean Sea water inflow into the Black Sea is investigated using acoustic and oceanographic data obtained in the Black Sea exit region. The path of Mediterranean water and the resulting spreading on the continental ... -
Observed sound velocity and temperature profiles in the Strait of Gibraltar during the passage of an internal wave
(NATO. SACLANTCEN, 1966/10)Sound velocity and temperature measurements taken from the sea-surface to 350 m depth, close to one spot over a 24-hour period revealed the passage of an internal wave of approximately 60 m amplitude. The effect of this ... -
Ocean currents in the Iceland-Faeroe area, measured by a bottom-mounted ADCP
(NATO. SACLANTCEN, 1992/12)Horizontal currents as a function of depth, measured by a bottommounted