Analysis of Irregular Characteristics of Reverberation Spectrum in Shallow Sea

Shallow sea reverberation is one of the main interferences in the active detection of underwater targets, and the working frequency of active sonar continues to expand to low frequencies, and the problem of reverberation interference is also receiving increasing attention. Focusing on the need to dig deeper into the frequency domain characteristics of shallow sea reverberation, this paper starts from the fluctuation characteristics of the low frequency reverberation spectrum in shallow seas, and uses spectral irregularity (SI) to characterize the spectrum fluctuations of the reverberation in shallow sea. First, based on the shallow sea reverberation point scattering model, the shallow sea reverberation is simulated. Combining with the definition of the spectrum irregularity value, the statistical results of the shallow sea reverberation spectrum irregularity value are studied, and the different pulse widths and different time periods of the multi-sample data are analyzed and compared. The results show that at the same transmitting frequency, when the pulse width of the transmitted signal increases, the SI value of the reverberation basically gradually decreases, and the SI value of the reverberation basically obeys the increase with the attenuation of the reverberation level.