Improvement of Longitudinal Correlation of Explosive Signals by Using Waveguide Invariance

Longitudinal correlation is a very important parameter in underwater acoustic signal processing. Normal mode interference is often the dominating effect on the decrease of the low frequency longitudinal correlation coefficient. Based on the waveguide invariance, a method was developed to enhance the correlation between the signals recorded by two horizontally separated hydrophones. In this research, the method is used to deal with other experimental data. Unlike the former research, the signal is generated by an explosive source, which is more complicated than a bulb source due to the strong bubble pulse following the shock wave. The results show that the spatial correlations of low frequency signals received by a horizontal array can be improved measurably.