Measured broadband reverberation characteristics in Deep Ocean

Abstract

Broad band reverberation measurements were collected in deep water (2067m) off Vizag. TNT scare charges (0.450 kg) were used as sound sources which were expended from the ship. The signals were recorded using two hydrophones deployed from the ship. The sound speed profile exhibits 63m duct with a limiting ray angle of about 4.47^o and lower cut off frequency of 177 Hz. A flat plateau and then sudden fall of 10 dB near ~12-13s on the reverberation characteristic in deep water is related to the effect of sound speed profile and water depth. This strong reverberation return will have major consequences on the reverberation limited sonar performance. This effect is correlated with ray theory based model and the results are presented.