Adaptive Bubble Pulse Cancellation From Underwater Explosive Charge Acoustic Signals

Explosive charges are widely used as sound sources in underwater acoustic experiments. Unfortunately, the received shock wave in the observation is often corrupted by a series of bubble pulses. Canceling these bubble pulses can greatly enhance the quality of the observation and will be helpful for many practical applications. A method based on the adaptive filtering is presented to fit the bubble pulses in the observation, in which the filter coefficients are updated by an adaptive least squares approach. The bubble pulses are then subtracted from the observed signal. The autocorrelation functions, time-frequency representation, and extracted mode 1 and mode 2 of the filtered observation show that the bubble pulses can be effectively canceled.