Browsing CMRE Publications by Issue Date

Now showing items 621-640 of 882

    • Bottom reflection properties deduced from an ambient noise: simulation of a processing technique 

      Harrison, Chris H.; Baldacci, Alberto (NATO. SACLANTCEN, 2002/11)
      A promising new method has already been proposed [SACLANTCEN SM-387] to calculate bottom reflection loss from ambient noise directionality. Although this method has been tried experimentally at more than 11 sites under ...

    • SUPREMO: a multistatic sonar performance model 

      Harrison, Chris H. (NATO. SACLANTCEN, 2002/11)
      Multistatic sonars introduce new problems to the modeller such as mutual interference from multiple sources and variable target aspect in a background of range-dependent bistatic reverberation. A multistatic sonar performance ...

    • The characterization of a range-dependent environment using towed horizontal array data from the MAPEX 2000 experiment 

      Fallat, Mark; Nielsen, Peter L.; Siderius, Martin (NATO. SACLANTCEN, 2002/11)
      The characterization of ocean environments using geoacoustic inversion techniques has received a

    • 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

    • 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

    • Formulae for bistatic signal and reverberation 

      Harrison, Chris H. (NATO. SACLANTCEN, 2002/12)
      This report demonstrates that it is possible to obtain closed-form solutions for signal and reverberation in a wide variety of bistatic scenarios including ducts and bottom bathymetry. These formulae adapt earlier monostatic ...

    • Signal and reverberation formulae including refraction 

      Harrison, Chris H. (NATO. SACLANTCEN, 2003/04)
      Because reverberation is an incoherent process it is possible to base realistic solutions on very simple flux theory. This report extends the closed-form signal and reverberation formulae of an earlier report [SACLANTCEN ...

    • A study of the uncertainty in estimate seabed properties as a result of goeacoustic inversion algorithms 

      Fallat, Mark; Dosso, Stan E.; Nielsen, Peter L. (NATO. SACLANTCEN, 2003/10)
      This paper investigates the inherent uncertainty in estimated seabed properties derived from matched-field geoacoustic inversion algorithms. This algorithm-induced uncertainty must be considered when interpreting inversion ...

    • Annual Progress Report 2004 

      NURC (NURC, 2005)

    • Infrared detection of marine mammals 

      Baldacci, Alberto; Carron, Michael J.; Portunato, Nicola (NURC, 2005/12)
      An infrared (IR) binocular, designed for in-the-field military applications, was tested using in situ marine mammals during the Mar Ligure Joint Experiment 2003 (MLJX03) that took place in August-September 2003 onboard the ...

    • Annual Progress Report 2005 

      NURC (NURC, 2006/03)
      This Progress Report describes the Centre's unclassified technical accomplishments and outputs realised under the Scientific Programme of Work (SPOW) for 2005. The Centre conducts maritime research in support and anticipation ...

    • 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, ...

    • Adaptive normalization of active sonar data 

      Baldacci, Alberto; Haralabus, Georgios (NURC, 2006/08)
      In active sonar detection the background interference is reduced through normalization prior to applying a detection threshold. From the two mainstream normalization algorithms, i.e. the sliding window and the split window, ...

    • A Bayesian approach to predicting an unknown number of targets based on sensor performance 

      Bryan, Karna; Carthel, Craig (NURC, 2006/08)
      Estimating remaining targets after some attempt has been made to detect an overall, unknown number of targets is critical to determining the potential threat associated with these remaining targets. This paper presents a ...

    • Active detection enhancement in coastal areas 

      Haralabus, Georgios; Baldacci, Alberto; Laterveer, Rene (NURC, 2006/08)
      The processing chain used for active detection analysis in association with measures of performance that allow real time performance monitoring is presented. Real life examples demonstrating environmental volatility ...

    • Benchmark analysis of NURC multistatic tracking capability 

      Gerard, Odile; Coraluppi, Stefano; Carthel, Craig; Grimmett, Douglas (NURC, 2006/08)
      This paper provides a brief description and performance results for the multistatic sonar trackers developed at NURC. Our analysis is based on common data distributed as part of the Multistatic Tracking Working Group ...

    • 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 ...

    • Cardioid receive array calibration for active systems 

      Baldacci, Alberto; Haralabus, Georgios; Van Velzen, Marcel (NURC, 2006/08)
      Nowadays active detection improvement relies significantly on advanced sensor technology, such as the cardioid receive array that allows the directional (right/left) discrimination of the received signal. However, in ...

    • The dynamics of information fusion: synthetic versus misassociation 

      Kessel, Ronald T. (NURC, 2006/08)
      Fusion entails both the association and synthesis of information. If missassociations occur, they obviously undermine the gains won by synthesis, compromising the fusion product. An analytic framework is presented here to ...

    • Geo-spatial tactical decision aid systems: fuzzy logic for supporting decision making 

      Grasso, Raffaele; Giannecchini, Simone (NURC, 2006/08)
      Tactical decision aid systems support