DefinePK

Abstract

Ambient noise is the prevailing unsustainable noise in the sea. It is the background noise, typical of the location & depth against which a signal like the sound of a submarine or the echo from a target must be detected. Underwater ambient noise continuously varies in level and spectral content. It excludes self noise like electrical noise, current flow around measurement hydrophone. So we need to measure the ambient noise considering different factors like wind, precipitation, biological noise, tides etc. The ambient noise is measured using the vertically spaced hydrophones in the shallow water of the Arabian Sea region. Using these ambient noise measurements, vertical coherence is estimated. Theoretical model for vertical coherence is also calculated. In this paper comparison between the theoretical and the practical vertical coherence is done.