Browsing Reprints by Title

Now showing items 94-113 of 548

    • Assessment techniques for computer models of sound propagation 

      Wood, David H. (NATO. SACLANTCEN, 1975/10)
      Computer models of sound propagation have exactly three drawbacks: the model only approximates reality,the computer program only approximates the model, and the cost approximates infinity. The only way to assess these ...

    • At-sea measurements of acoustic elastic scattering by a 1.5m-long cylinder made of composite materials 

      Tesei, Alessandra; Zampolli, Mario; Canepa, Gaetano (NURC, 2007/12)
      Monostatic and bistatic acoustic scattering measurements were performed on solid-filled fibreglass objects (a sphere and a cylinder with hemispherical endcaps) deployed proud on a sandy seabed and insonified by a rail-mounted ...

    • At-sea measurements of diver target strengths at 100 Khz: measurement technique and first results 

      Hollett, Reginald D.; Kessel, Ronald T.; Pinto, Marc A. (NURC, 2006/08)
      During a recent at-sea trial of a diver detection system, the opportunity was taken of developing a technique for in-situ measurement of diver target strengths. The technique was based on making the diver perform circular ...

    • Attenuation of shear waves in near-surface sediments 

      Richardson, Michael D. (NATO. SACLANTCEN, 1997)
      In situ measurement of compressional and shear speed and compressional attenuation in near-surface marine sediments is a well-developed technology but techniques required to measure shear attenuation have lagged behind. ...

    • Autofocusing a synthetic aperture sonar using the temporal and spatial coherence of seafloor reverberation 

      Pinto, Marc A.; Fohanno, F.; Tremois, O.; Guyonic, S. (NATO. SACLANTCEN, 1997)
      An autofocusing algorithm for the compensation of translational motion errors of a sea floor rmaging synthetic aperture side scan sonar is presented. The algorithm does not depend on the presence or absence of dominant ...

    • Automated port traffic statistics: from raw data to visualization 

      Cazzanti, Luca; Davoli, Antonio; Millefiori, Leonardo (CMRE, 2017/11)
      We describe how we leveraged best practices in big data processing pipeline design and visual analytics to prototype the Maritime Patterns-of-Life Information Service (MPoLIS), an information product currently under ...

    • Automatic change detection for the monitoring of cluttered underwater areas 

      Coiras, Enrique; Groen, Johannes; Evans, Benjamin; Pinto, Marc A. (NURC, 2008/09)
      Automating the surveillance of cluttered underwater areas (such as ports) poses several problems, the main one being the high number of contacts that any automatic target recognition (ATR) system will produce when surveying ...

    • Autonomous networked anti-submarine warfare research and development at CMRE 

      LePage, Kevin D.; Goldhahn, Ryan A.; Alves, João; Strode, Christopher; Braca, Paolo; Ferri, Gabriele; Munafò, Andrea; Oddone, Manlio; Sildam, Jüri; Baralli, Francesco; Biagini, Stefano; Canepa, Gaetano; Colombo, Marco; Grandi, Vittorio; Grenon, Gabriel; Mazzi, Marco; Micheli, Michele; Parisi, Gerardo; Saia, Paolo; Vermeij, Arjan; Zappa, Giovanni (CMRE, 2019/06)
      CMRE has been evaluating the potential of autonomous networked ASW using underwater vehicles through a program of sonar signal processing, underwater communications, navigation and robotic behavior developments and at-sea ...

    • Autonomous underwater surveillance networks: a task allocation framework to manage cooperation 

      Ferri, Gabriele; Bates, Jeffrey; Stinco, Pietro; Tesei, Alessandra; LePage, Kevin D. (2019/05)
      The design of efficient task allocation schemes is essential to manage autonomous underwater robotic surveillance networks. The network has to assign the most suited robots to the tasks which compose the mission, in spite ...

    • An autonomous underwater vehicle data-driven control strategy for target tracking 

      Ferri, Gabriele; Munafò, Andrea; LePage, Kevin D. (CMRE, 2019/05)
      This paper presents a data-driven approach to control the movement of autonomous underwater vehicles (AUVs) operating as receivers of a multistatic sonar surveillance network. The algorithm adopts a nonmyopic receding ...

    • Autonomous underwater vehicles for port protection 

      Bovio, Edoardo (NURC, 2006/07)
      NATO's present capability to deal with a terrorist threat to our ports is slow, dangerous, and inefficient. Ports are a challenging area within which to conduct MCM operations due to several factors: shipping movements, ...

    • AUV active perception: exploiting the water column 

      Munafò, Andrea; Ferri, Gabriele; LePage, Kevin D.; Goldhahn, Ryan A. (CMRE, 2019/06)
      Autonomous Underwater Vehicles (AUVs) present a low-cost alternative or supplement to existing underwater surveillance networks. The NATO STO Centre for Maritime Research and Experimentation is developing collaborative ...

    • AUV technology for shallow water MCM reconnaissance 

      Evans, Benjamin; Baralli, Francesco; Bellettini, Andrea; Bovio, Edoardo; Coiras, Enrique; Davies, Gary L.; Groen, Johannes; Myers, Vincent; Pinto, Marc A. (NURC, 2007/10)
      The ability to perform MCM reconnaissance missions in shallow water is important in both expeditionary MCM and in the protection of ports against maritime improvised explosive devices (MIEDs). For many years AUV systems ...

    • AUV-enabled adaptive underwater surveying for optimal data collection 

      Williams, David P. (NURC, 2012/04)
      A new adaptive strategy for performing data collection with a sonar-equipped autonomous underwater vehicle (AUV) is proposed. The approach is general in the sense that it is applicable to a wide range of underwater tasks ...

    • Bandwidth efficient concurrent localisation and communication in underwater acoustic networks 

      Sliwka, Jan; Munafò, Andrea; Petroccia, Roberto (CMRE, 2019/05)
      Localisation is essential for an Autonomous Underwater Vehicle (AUV) to perform its mission and to georeference any data acquired during the dive. When the AUV is part of a heterogeneous underwater acoustic network (UAN), ...

    • Bathymetry, gravity and magnetism in the Strait of Sicily 

      Morelli, Carlo (NATO. SACLANTCEN, 1972/09)
      In cooperation with SACLANTCEN, O.G.S. started in 1961 the geophysical survey of the Mediterranean Sea (Allan, Morelli, 1971 ), which after 1966 was continued in the seas around Italy on the oceanographic ships of C.N.R. ...

    • Bayesian inference and sidescan restoration 

      Calder, B. R.; Linnett, L. M. (NATO. SACLANTCEN, 1997)
      We consider a Bayesian approach to the problem of inferring parameters of the SONAR environment given only the gathered sidescan image. A simplified model of the process is developed along with suitable distributions on ...

    • Bayesian multi-class covariance matrix filtering for adaptive environment learning 

      Braca, Paolo; Aubry, Augusto; Millefiori, Leonardo; De Maio, Antonio; Marano, Stefano (CMRE, 2019/05)
      Covariance matrix estimation is a crucial task in adaptive signal processing applied to several surveillance systems, including radar and sonar. In this paper we propose a dynamic environment learning strategy to track ...

    • Bayesian track-to-graph association for maritime traffic monitoring 

      Grasso, Raffaele; Millefiori, Leonardo; Braca, Paolo (CMRE, 2019/05)
      We present a hypothesis test to associate ship track measurements to an edge of a given graph that statistically models common traffic routes in a given area of interest. The association algorithm is based on the hypothesis ...

    • Beam spreading and loss of spatial coherence in an inhomogeneous and fluctuating ocean 

      McCoy, John J. (NATO. SACLANTCEN, 1975/10)
      A theory has been developed that enables estimates to be made of beam bending, beam spreading and loss of spatial coherence. In this paper we concentrate on the loss of spatial coherence due to scattering. Using a minus ...