Spatial correlation of the high intensity zone in deep-water acoustic field

• Published in: Chinese physics B Vol. 25; no. 12; pp. 69 - 76
• Main Author: 李鋆 李整林 任云
• Format: Journal Article
• Language: English
• Published: 01.12.2016
• Subjects: 实验数据; 接收信号; 水下目标; 水声场; 深水区; 相关系数; 空间相关性; 高烈度区
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/25/12/124310

The spatial correlations of acoustic field have important implications for underwater target detection and other ap- plications in deep water. In this paper, the spatial correlations of the high intensity zone in the deep-water acoustic field are investigated by using the experimental data obtained in the South China Sea. The experimental results show that the structures of the spatial correlation coefficient at different ranges and depths are similar to the transmission loss structure in deep water. The main reason for this phenomenon is analyzed by combining the normal mode theory with the ray theory. It is shown that the received signals in the high intensity zone mainly include one or two main pulses which are contributed by the interference of a group of waterbome modes with similar phases. The horizontal-longitudinal correlations at the same receiver depth but in different high intensity zones are analyzed. At some positions, more pulses are received in the arrival structure of the signal due to bottom reflection and the horizontal-longitudinal correlation coefficient decreases accordingly. The multi-path arrival structure of receiving signal becomes more complex with increasing receiver depth.