The Method of Bubble Pulse Removal from Explosive Signals and Its Application

摘要

An under-water explosive source signal is composed of a shock wave and several bubble pulses which can seriously interfere with the transmission of the shock wave. The composite signal can be presented with a convolving model. Based on the complex cepstrum analysis of the explosive signal, a homomorphic deconvolving bubble pulse removal method is proposed. This method can be applied to two situations, i.e. the amplitude of the 1st bubble pulse is less as well as greater than that of the shock wave. To avoid the discontinuity caused by commonly used comb-like filters in homomorphic systems, an improved filter with polynomial fitting is brought up. The simulated and experimental results show that, bubble pulses in explosive signals are effectively eliminated; shock waves are reconstructed successfully. This is important as a technical approach to both studies of pulse response functions of ocean channels and geoacoustic inversion with explosive sources. [Work supported by National Natural Science Foundation 10734100].