UACE2017 Proceedings: A fast target strength model and its application with a multipath propagation model

• Session:
  Target Echo Strength-Measurements and Modelling
• Paper:
  A fast target strength model and its application with a multipath propagation model
• Author(s):
  Lennart Bossér, Jörgen Pihl
• Abstract:
  Full-scale target strength measurements of submarines indicate that major contributions arise from parts between the pressure hull and the casing. Even tanks inside the pressure hull itself can give large contributions to the target strength under some circumstances. The design of the submarine generally incorporates structures of plates in the form of straight angle corners or cat´s-eye shapes which are excellent acoustic reflectors. Prudent application of transmission-loss and/or reflection-loss coatings to parts of the submarine can yield significant reduction of the target strength. Essential requirements on any target strength modelling method are therefore the abilities to model sound transmission through outer structures, double- and triple-bounce sound reflection, and the effect of coating materials in conjunction with a backing steel plate.\nThe monostatic target strength model SubSig TS was presented at UACE 2015. The main objective for developing this model was to support the early phases of submarine design with an interactive tool for signature prediction and requirements analysis. Two significant features of the model are: a) It is very fast and thus suitable for real-time or near real-time applications, b) It can be used as a target model in simulations, e.g. in conjunction with wave propagation models, due to its stream IO-interface.\nROSES (Robust Operational Submarine Echo Simulator) is an application where SubSig TS is combined with the REV3D ray trace model to predict the echo from a submarine including environmental effects such as multipath propagation and reverberation. ROSES is fully integrated in COMBIS (Combined Maritime Background Information System) which provides a uniform and comprehensive interface to a wide range of prediction models using existing hydrographical and meteorological data.\nThis paper will present a brief overview of the SubSig TS model and the ROSES application
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Contact details

• Contact person:
  Mr Lennart Bossér
• e-mail:
  
• Affiliation:
  FOI, Swedish Defence Research Agency
• Country:
  Sweden