Adaptive Bubble Pulse Cancellation and Its Applications

Abstract

Explosive sources are widely used as sound sources in underwater acoustics experiments. Unfortunately, the resulting direct pulse is often corrupted by bubble pulses, which has an undesired influence on the observation and its applications. Canceling these bubble pulses will greatly enhance the quality of the observation and will be helpful for its applications. To cancel the bubble pulse, an adaptive filter, updated from an adaptive least squares algorithm in order to model the physical transmission from the explosive source to the receiver, is proposed. The auto‐correlation functions of both the original field trial data and the filtered results show the bubble pulses in the observation can be effectively cancelled. The normal modes of signal propagation can be reconstructed from the filtered results with an adaptive time‐frequency representation. The estimated time delay of different normal modes is further applied in geo‐acoustic inversion.