The preliminary study on spatial correlation of ocean sound field

Abstract

The sound field temporal correlation and spatial correlation, which are the foundation of the investigation of underwater signal space-time high-order characteristics, have important value in the underwater acoustic application. The spatial correlation is studied based on the shallow water acoustic propagation experiment data acquired in the northern South China Sea in 2017, and the deep water acoustic propagation experiment data acquired in the western Pacific in 2013. As for the explosive sound signals in shallow water, time domain waveform cross-correlation coefficients between signals from different propagation distance are calculated. In contrast, the linear frequency modulated signals in deep water need additional matched filtering. The signal processing results shows that, the overall spatial correlation is poor and the correlation radius is relatively small in shallow water, the convergence zone has an obviously better spatial correlation than the shadow zone for the deep water situation. The processing result is verified by simulation and analysis.

Deep-sea explosion sound signal propagation loss measurement and model verification

“…Zhang et al conducted the transverse horizontal spatial coherence of explosive signals in the northern area of South China Sea [16]. Weng et al studied the spatial correlation based on the shallow water acoustic propagation experiment data acquired in the northern South China Sea area [17].…”