Inversion of seabed acoustic parameters by using the bubble pulses and the shock wave

Abstract

Explosive charges are widely used in underwater acoustics experiments because it has wide bandwidth and high source level. the received signals are the shock wave and followed by a series of bubble pulses, which seriously affect the observation and applications of the signal. But for the shallow water waveguides, the bubble pulses could be seen as anther “signal”. In this paper, we treat the first bubble pulse as a signal to extract the dispersion curve through the warping transformation and then to invert the seabed velocity and density; At the same time, we get the shock wave of data from some depth with a higher SNR(signal to noise ratio) and its first mode wave, then the distance normalized normal modes transmission loss is used to obtain the seabed attenuation.