Browsing Rapporter by Author "Hjelmervik, Karl Thomas"

Now showing items 1-6 of 6

    • Classification of acoustically stable areas using empirical orthogonal functions - examination of stability methods 

      Østenstad, Petter; Hjelmervik, Karl Thomas (2011-11-08)
      Overview and control of the oceanographic and acoustic variations are very important in underwater warfare. We have developed a method for dividing an area into smaller subareas that can be represented by a single vertical ...

    • LYBIN 6.0 - user manual 

      Dombestein, Elin; Gjersøe, Amund; Hjelmervik, Karl Thomas; Kloster, Morten (2011-07-18)
      The acoustic ray trace model LYBIN uses a broad set of parameters to accurately calculate the probability of detecting objects in a given area under water with the use of sonar technology. As this probability changes with ...

    • Proposed use of Lybin in project Simson 

      Tveit, Elling; Hjelmervik, Karl Thomas; Dombestein, Elin (2003)
      Previous and present versions of the acoustic ray trace model Lybin are described briefly. The use of Lybin in FFI project Simson can be divided into three categories: simulation of submarine detection coverage, simulation ...

    • Sensitivity of LYBINs transmission loss due to variations in sound speed 

      Hjelmervik, Karl Thomas (2006)
      This study is motivated by the Sea Acceptance Test 2 (SAT2) to be made sometime in 2006. The testing of the new Norwegian Frigates sonar system will involve use of the acoustic ray trace model, LYBIN. The study reveals ...

    • Sonar simulation for the Action Speed Tactical Trainer at KNM Tordenskjold 

      Hjelmervik, Karl Thomas; Gjersøe, Amund; Alsterberg, Svein (2008)
      This report describes a sonar simulation module planned implemented into Kongsberg Defence and Aerospace’s Action Speed Tactical Trainer. A land-based and modular training facility for frigate crew members. The sonar ...

    • Undersøkelse av sonarsimulatoralgoritme i PROTEUS 

      Hjelmervik, Karl Thomas (2014-05-09)
      KDA har utviklet en sonarsimulator som er basert på en metode utviklet av FFI [1]. Sonarsimulatoren brukes i dag i den KDA-utviklede treneren, PROTEUS. Sjøforsvaret har rapportert manglende realisme i simuleringene og ...