Browsing by Title

Now showing items 521-540 of 882

    • Mutual coherence and silence 

      Debart, Hubert P. (NATO. SACLANTCEN, 1985/01)
      In this paper we are developing the theoretical principle of a modification of the acoustical emission by a ship. Its objective is making inefficient the angular measurements achieved by a detector. More precisely, the ...

    • NATO STO-CMRE 2020 annual report 

      CMRE (CMRE, 2020-02)
      This Progress Report describes the Centre’s unclassified technical accomplishments and outputs performed under the 2020 programme of work.

    • NATO Undersea Research Centre human diver and marine mammal risk mitigation rules and procedures 

      NURC. Marine Mammal Risk Mitigation Project. (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 

      Ryan, Kendra (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 

      Unknown author (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 ...

    • Near field propeller radiated noise measurements: model and full scale experimental data comparison 

      Accardo, Lucio; Colombo, Agostino (NATO. SACLANTCEN, 1985/01)
      The ever rising interest related to the underwater no1se originating from cavitating propellers prompted the Italian Navy to study this aspect of naval architecture in an experimental way. This was accomplished carrying ...

    • NEMO: An architecture for software communications research in the maritime domain 

      Vermeij, Arjan; Furfaro, Thomas C.; Alves, João (CMRE, 2019/06)
      This paper presents a high-level overview of NEMO, an implementation of a communications research software workspace with special focus on application scenarios involving underwater (e.g. acoustic), and other maritime ...

    • Network-enabled information fusion in support of underwater research 

      Berni, Alessandro; Merani, Diego; Leonard, Michel (NURC, 2007/11)
      Advanced communication and information processing techniques can be applied to underwater research to enable new ways of enhancing real-time experimental outcome. This paper is concerned with three main areas where ...

    • New mechanical equipment for handling oceanographic cables 

      Frassetto, Roberto; Manzotti, Vittorio; Chiarabini, Anselmo (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 ...

    • The new muesli complexity metric for mine-hunting difficulty in sonar images 

      Williams, David P. (CMRE, 2019/05)
      A new image complexity metric has been developed that fuses the concept of lacunarity, a measure of pixel intensity variation, with the notion of spatial information, a quantity that captures edge energy. This new metric, ...

    • Noise measurements during MAPEX 2000 

      Harrison, Chris H. (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 ...

    • Noise sources in the ocean - part 1 

      Wille, Peter C. (NATO. SACLANTCEN, 1975/10)
      Following a brief historical survey of the development of our knowledge of the origins and characteristics of ambient noise in the ocean, the principal known sources of noise are described. These are: environmental origin, ...

    • Noise sources in the ocean - part 2 

      Daintith, Maurice J. (NATO. SACLANTCEN, 1975/10)
      Following a brief historical survey of the development of our knowledge of the origins and characteristics of ambient noise in the ocean, the principal known sources of noise are described. These are: environmental origin, ...

    • NOSC signal processing evaluation laboratory 

      Pennoyer, Bryson (NATO. SACLANTCEN, 1979/12)
      A new acoustic Signal Processing Evaluation Laboratory (SPEL) at the Naval Ocean Systems Center (NOSC), San Diego, is described. This laboratory has been designed to support a broad program of research and development of ...

    • Notes on the interpretation of ambient noise statistics 

      Cavanagh, Raymond C. (NATO. SACLANTCEN, 1982/06)
      Interpretation of statements about the character of ambient sea noise, as well as schemes to measure or model noise, are sensitive to the context or underlying view of what is essentially a stochastic process. A framework ...

    • Nowcasting and forecasting of sound velocity structure by ocean modelling 

      Onken, Reiner (NATO. SACLANTCEN, 1999/04)
      The Harvard Ocean Prediction System (HOPS) is applied to an observed oceanographic data set in

    • 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 ...

    • Numerical modelling of acoustic scattering by smooth inclusions in a layered fluid-solid medium 

      Karasalo, Ilkka; Mattsson, Johan (NATO. SACLANTCEN, 1997)
      A boundary integral equation (BIE) method as descnbed for computing the scattering of a monofrequent acoustic field by a smooth, rigid 30 object in a layered range-independent fluid-solid medium. The BIE is discretized ...

    • Numerical simulation of the effects of bathymetry on underwater sound propagation using three-dimensional parabolic models 

      Sturm, Frédéric B.; Fawcett, John A. (NATO. SACLANTCEN, 1998/03)
      Two different three-dimensional parabolic equation (PE) methods are

    • Observations of Mediterranean flow into the Black Sea 

      Di Iorio, Daniela; Yuce, Hüseyin (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 ...