Browsing by Author "Jensen, Finn B."
Now showing items 1-20 of 25
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Acoustic impact of upper ocean models
Porter, M. B.; Piacsek, Steve; Henderson, Laurel; Jensen, Finn B. (NATO. SACLANTCEN, 1989/12)The upper mixed-surface layer of the ocean, with its homogeneous vertical temperature profile, provides a somewhat special acoustic propagation environment where the sound speed will increase (due to pressure) down to the ... -
Benchmarking scattering in ocean waveguides
Jensen, Finn B.; Ferla, Carlo M.; Gerstoft, Peter (NATO. SACLANTCEN, 1995/07)Accurate numerical solutions are presented for benchmark problems -
Bottom-interacting ocean acoustics: proceedings of a conference held at SACLANTCEN on 9-13 June 1980
Kuperman, William A.; Jensen, Finn B. (NATO. SACLANTCEN, 1980/07) -
Broadband signal simulation in shallow water
Jensen, Finn B.; Ferla, Carlo M.; Nielsen, Peter L.; Martinelli, Giovanna (NATO. SACLANTCEN, 2002/12)Today's minimum requirements for ocean acoustic models are to be able to simulate broadband signal transmissions in 2D varying environments with an acceptable computational effort. Standard -
C-SNAP: Coupled SACLANTCEN Normal mode propagation loss model
Ferla, Carlo M.; Porter, Michael; Jensen, Finn B. (NATO. SACLANTCEN, 1993/12)On the basis of a widely used and efficient range-independent normal mode code, SNAP, and a numerical solution technique for one-way mode coupling obtained from KRAKEN, we have built a range-dependent propagation loss model ... -
Deterministic propagation modelling: Part 1: Fundamental principles *Part 2: Numerical results
Kuperman, William A.; Jensen, Finn B. (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. -
Evaluation of experimental techniques for determining the plane wave reflection coefficient at the sea floor
Schmidt, Henrik; Jensen, Finn B. (NATO. SACLANTCEN, 1986/06)One of the most commonly used techniques for determinati on of the geoacoustical properties of the sea bed is the measurement of plane wave reflection coefficients at the ocean bottom. An incident field is pr oduced by ... -
Geo-acoustic inversion of the PROSIM'97 experimental data using simplex simulated annealing
Fallat, Mark; Nielsen, Peter L.; Jensen, Finn B. (NATO. SACLANTCEN, 2000/01)In the spring of 1997 SACLANTCEN performed an experiment near the Elba island in the Mediterranean Sea. The PROSIM'97 experiment was designed for the validation of a broadband acoustic propagation model. During the period ... -
High-frequency normal-mode calculations in deep water
Ferla, Melchiorre C.; Jensen, Finn B.; Kuperman, William A. (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-speed simulation of an underwater acoustic field using an array processor
Kuperman, William A.; Jensen, Finn B.; Martinelli, Giovanna (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 ... -
Mode and PE predictions of propagation in range-dependent environments: SWAM'99 workshop results
Nielsen, Peter L.; Jensen, Finn B. (NATO. SACLANTCEN, 2000/05)Three numerical acoustic models, a coupled normal-mode model (C-SNAP), -
Numerical modeling results for mode propagation in a wedge
Jensen, Finn B.; Tindle, C. T. (NATO. SACLANTCEN, 1987/11)A PE (parabolic equation) code is used to study propagation in a shallow water wedge with a penetrable bottom. Particular attention is given to "wedge modes" that have wave fronts that are arcs of circles centered on the ... -
PC-based propagation and sonar prediction models
Dreini, Giancarlo; Isoppo, Cinzia; Jensen, Finn B. (NATO. SACLANTCEN, 1995/12)Six acoustic models available for use on PC's are tested on a series of typical propagation situations from the North Atlantic and the Mediterranean. The model set includes both early US Navy models (ASTRAL, FACT, RAYMODE) ... -
Performance assessment of propagation models in AESS-6.0
Ferla, Carlo M.; Jensen, Finn B. (NATO. SACLANTCEN, 1999/08)A set of AESS propagation-loss predictions has been generated for typical operational scenarios in both deep and shallow water, for two sonar frequencies (500 and 3500 Hz) and for several source-receiver combinations. ... -
Performance assessment of the LYBIN - 2.0 propagation-loss model
Ferla, Carlo M.; Isoppo, Cinzia; Martinelli, Giovanna; Jensen, Finn B. (NATO. SACLANTCEN, 2001/07)A new acoustic model LYBIN has been proposed for inclusion in the AESS model set. In order to determine this model's prediction accuracy and computational efficiency, SACLANTCEN was tasked to test LYBIN on exactly the same ... -
PROSIM broadband normal-mode model: a user's guide
Bini-Verona, Francesco; Nielsen, Peter L.; Jensen, Finn B. (NATO. SACLANTCEN, 2000/02)PROSIM is a layered normal-mode model approach for adiabatic broadband range-dependent sound -
RAPID RESPONSE, september 1996: modelling of broadband transmission loss along selected tracks in the Strait of Sicily
Ferla, Carlo M.; Jensen, Finn B.; Akal, Tuncay (NATO. SACLANTCEN, 1997/07)A large set of experimental acoustic broadband data in the 50-3200 Hz band is analyzed with the objective of deriving average geoacoustic models for three sites in the Strait of Sicily. The experimental data were obtained ... -
Review of numerical models in underwater acoustics including recently developed fast-field program
Jensen, Finn B.; Schmidt, Henrik (NATO. SACLANTCEN, 1984/12)Two papers given by SACLANTCEN personnel at the NATO Advanced Research Workshop on Hybrid Formulation of Wave Propagation and Scattering at Castel Gandolfo, Rome, Italy on 30 August to 3 September 1983 are published as a ... -
Review of target strength information for waterside security applications
Zampolli, Mario; Jensen, Finn B.; Tesei, Alessandra (NURC, 2008)Estimates of the target strength of objects, such as for example scuba tanks and swimmer delivery vehicles, are parameters of interest in all phases of the design of waterside security systems. Results of numerical target ... -
Shear properties of ocean sediments determined from numerical modelling of Scholte wave data
Jensen, Finn B.; Schmidt, Henrik (NATO. SACLANTCEN, 1986/06)Recently it has become apparent that shear properties of ocean sediments are most easily determined from measured propagation characteristics of seismic interface waves. We use a newly developed numeri ca l model of wave ...