기포/난류항적 산란신호의 모델링 이론과 실험적 검증

Abstract

As a part of the development of wake detection, the acoustic reverberation model is required for the simulation of the wake detector. Wake is separately divided to the ship wake by surface vessel and the turbulence wake by underwater vessel.

In this thesis, a reverberation model for the wake detection is presented. In case of the ship wake, the reverberation model consists of the acoustic scattering model due to the distribution of the micro-bubbles and the kinematic model for the moving active sonar. And, in case of the turbulence wake, the spectral spreading due to the acoustic doppler effect from moving scatterers is included in the reverberation model. In order to verify the developed reverberation model, a series of sea experiment was executed in September 2007 to obtain the spatial-temporal distribution of a bubble clouds and, acoustic water-tank experiment was executed in October 2007 to observe the scattering signals from the turbulence region. The measured signals were analyzed and compared with the simulated signals.