Selective Reverberation Cancellation via Adaptive Beamforming

摘要

This thesis applies the adaptive beamforming concept to the problem of selective reverberation cancellation, with an emphasis on experimental verification. Oceanic reverberation is often a limiting form of interference in echo detection applications. It may also be the signal of interest conveying valuable information about the scatterers or physical processes influencing their dynamical behavior. Because of stringent limitations imposed by the oceanic medium on the directional characteristics of sonar systems, reverberation is often composite in nature with two or more unrelated reverberation types contributing to the acoustic return. In that setting it would be desirable to selectively cancel the unwanted reverberation component(s) while preserving the component of interest. This signal processing problem whereby both signal and noise are constituent components of the received reverberation process is the focus of this thesis. The related problem of extracting reflector echoes from a reverberation backround is also considered.