Search
Now showing items 1-8 of 8
Spatial correlation of surface-generated noise in a stratified ocean
(NATO. SACLANTCEN, 1980/10)
A model is developed for the calculation of the spatial properties of the noise field produced in a stratified ocean by the action of wind at the surface. The random noise sources are represented by correlated monopoles ...
Relative contribution of surface roughness and bottom attenuation to propagation loss in shallow water
(NATO. SACLANTCEN, 1975/10)
A simulation study has been performed to investigate the relative importance of the contributions of surface roughness and bottom attenuation to propagation loss under differing environmental conditionso The NRL normal ...
High-frequency normal-mode calculations in deep water
(NATO. SACLANTCEN, 1982/10)
A method has been developed to perform high-frequency deep-water normal-mode calculations in the multikilohertz region in water depths of the order of 5 km. The results from this technique agree with fast field program ...
High frequency matched field processing
(NATO. SACLANTCEN, 1997)
Results are discussed from a high frequency (0 9-5 7 kHz), very shallow water (<10 m) experiment exploring the feasibility of carrying out matched field processing in this frequency and water depth regime The data was ...
Deterministic propagation modelling: Part 1: Fundamental principles *Part 2: Numerical results
(NATO. SACLANTCEN, 1981/06)
The physics of sound propagation in the ocean is briefly reviewed. The wave equation is presented and a set of solutions under a variety of approximations is discussed. The consistency among these solutions is illustrated.
Sound propagation in a wedge-shaped ocean with a penetrable bottom
(NATO. SACLANTCEN, 1980/07)
Modal cutoff during up-slope propagation in a wedge-shaped ocean is studied using the parabolic equation model; theoretical results are compared with some model tank experiments.
High-speed simulation of an underwater acoustic field using an array processor
(NATO. SACLANTCEN, 1979/12)
A computer model PAREQ for simulating the acoustic field of sound propagating in a complicated ocean environment has been installed on a realtime computer system (HP MX21) which includes an array processor (MAP 300). The ...
The optimum frequency of propagation in shallow-water environments
(NATO. SACLANTCEN, 1983/04)
The optimum frequency of propagation in shallow water environments is the result of competing propagation and attenuation mechanisms at high and low frequencies. It is shown that the optimum frequency is strongly dependent ...