Browsing by Title

Now showing items 614-633 of 882

    • Proceedings of the Maritime Situational Awareness Workshop 2019 

      Jousselme, Anne-Laure; Braca, Paolo; Millefiori, Leonardo; De Rosa, Francesca; Zocholl, Maximilian; Uney, Murat; Iphar, Clément; Gaglione, Domenico; Soldi, Giovanni; Forti, Nicola; D'Afflisio, Enrica (CMRE, 2021-01)
      The Maritime Situational Awareness Workshop (MSAW) was held 08 - 10 October 2019 in Lerici, La Spezia (Italy). CMRE organized this workshop with the objective of fostering the crossfertilization of ideas from scientific ...

    • Processing of broadband acoustic signals 

      Hovem, Jens M. (NATO. SACLANTCEN, 1972/05)

    • Project 03F - 1: phase 1 completion report 

      Davies, Gary L. (NATO. SACLANTCEN, 2002/12)
      This report describes the results of Phase I of Project 03F-1. The overall aim of this project is to

    • Propeller leading edge trimming and maintenance effects on ship's noise operational performance 

      Accardo, Lucio; Baù, F. (NATO. SACLANTCEN, 1985/01)
      In the last ten years, considerable experience has been gathered at CEIMM's cavitation tunnel (Centra Esperienze Idrodinamiche Marina Militare) on the effects of propeller leading edge geometry on cavitation (and noise) ...

    • 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

    • Protection in ports: countering underwater intruders 

      Kessel, Ronald T. (NURC, 2007/10)
      The advance of new capability depends on many things: the state of the art in technology, the clarity of the mission and requirements, the knowledge of the threat, the means of response, and, for developers, the state of ...

    • Qualitative aspects of seismograph-ocean bottom interaction 

      Snoek, Michael; Herber, R. (NATO. SACLANTCEN, 1988/06)
      The parameters affecting the coupling of the Ocean Bottom Seismometer to the ground have been

    • RABEL - A program to replay ABEL version 2.2 

      Canepa, Gaetano (NATO. SACLANTCEN, 1997/05)
      The description of a graphics software tool used to view and manipulate data file is presented. The software is implemented to run in the IDL environment on any platform. RAbel is able to read data from files in the ADAM ...

    • Random temperature structure as a factor in long-range propagation 

      Del Balzo, Donald R.; Moseley, W. B. (NATO. SACLANTCEN, 1975/10)
      A statistical description of horizontal thermal microstructure in anosotropic turbulence is developed for application with an existing acoustic propagation theory. The model predicts a temperature power density spectrum ...

    • Range and depth estimation by line arrays in shallow water 

      Klemm, Richard (NATO. SACLANTCEN, 1982/01)
      In shallow water sound propagates in terms of normal modes. The interference between the modes can be utilized to estimate range and depth of an acoustic source in shallow water by applying high resolution power estimators ...

    • Range estimation of cetaceans with compact volumetric arrays 

      Zimmer, Walter M. X. (CMRE, 2014/01)
      Passive acoustic monitoring is the method of choice to detect whales and dolphins that are acoustically active and to monitor their underwater behaviour. The NATO Science and Technology Organization Centre for Maritime ...

    • Range-dependent normal modes in underwater sound propagation 

      Graves, Ronald D.; Nagl, Anton; Uberall, Herbert M.; Haug, Anton J.; Zarur, George L. (NATO. SACLANTCEN, 1975/10)
      Normal mode theory is best suited for the case of stratified media. Range dependence of the medium properties and of its boundary may nevertheless be taken into account in the framework of an adiabatic approximation provided ...

    • Rapid Environmental Assessment: Proceedings of a conference held in Lerici, Italy, 10-14 March 1997, organized and sponsored by NATO SACLANTCEN 

      Rapid Environmental Assessment Conference (1997 March 10-14 : Lerici, Italy) (NATO. SACLANTCEN, 1997)

    • 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 ...

    • Ray convergence in a flux-like propagation formulation 

      Harrison, Chris H. (CMRE, 2014/01)
      The energy flux formulation of waveguide propagation is closely related to the incoherent mode sum, and its simplicity has led to development of efficient computational algorithms for reverberation and target echo strength, ...

    • Ray tracing on a mini-computer 

      Thompson, Martin; Wijmans, Willem (NATO. SACLANTCEN, 1971/12)
      It would appear that most people engaged in solving problems in ray- tracing, use programs written for large computers . These machines commonly have large memory sizes, fast cycle times and large word length 0 This paper ...

    • Ray tracing on a mini-computer 

      Thompson, Martin; Wijmans, Willem (NATO. SACLANTCEN, 1972/05)
      It would appear that most people engaged in solving problems in ray- tracing, use programs written for large computers. These machines commonly have large memory si~es, fast cycle times and large word length . This paper ...

    • Rays and statistical diffraction theory 

      Clarke, Richard H. (NATO. SACLANTCEN, 1971/12)
      A method of extending ray tracing is proposed, such that mediumscale irregularities of a statistical nature are taken into account along with large-scale irregularities in refractive index of the medium.

    • Real time-frequency active sonar processing: a massively parallel approach 

      Zvara, George P. (NATO. SACLANTCEN, 1993/08)
      A paradigm for massively parallel processing of matched filters, replica correlators, ambiguity functions and time-frequency distributions using an SIMD (Single Instruction Multiple Data) programming methodology is presented. ...

    • Real-and synthetic-array signal processing of buried targets 

      Pinto, Marc A.; Bellettini, Andrea; Hollett, Reginald D.; Tesei, Alessandra (NATO. SACLANTCEN, 2002/01)
      Results from two field experiments aimed at investigating the detection and classification of buried targets are presented. In both experiments a 2-16 kHz parametric source was used. In the first experiment the source was ...