关键词: 矢量水听器/
深海直达波区域/
传播特性/
距离估计
English Abstract
Analysis of sound propagation in the direct-arrival zone in deep water with a vector sensor and its application
Sun Mei1,2,Zhou Shi-Hong1,
Li Zheng-Lin1
1.State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;
2.School of Physics and Electronic Engineering, Taishan University, Taian 271000, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 11434012, 41561144006), the Scientific Research Foundation of the Higher Education Institutions of Shandong Province, China (Grant No. J12LJ56), and the Scientific Research Foundation of Taishan University (Grant No. Y-01-2013009).Received Date:09 November 2015
Accepted Date:18 January 2016
Published Online:05 May 2016
Abstract:The receiver at larger depth can receive the direct-arrival signal from a shallow source in a certain range in deep water. During a deep-water experiment conducted in 2014, a vector sensor located at a depth of 3146 m received the direct-arrival signals from the transducer towed at about 140 m depth by the source ship. In this paper, the propagation properties of the sound field in the direct-arrival zone in deep water are studied based on the ray theory and subsequently a source-range-estimation method is proposed. In the direct-arrival zone, the arrival angle is one of the most important properties of sound field, and the sound field is mainly composed of the contributions of a direct ray and a surface-reflected ray. The theoretical analysis and simulation results show that the amplitudes of horizontal particle velocity and vertical particle velocity are related to the mean arrival angle of the direct ray and the surface-reflected ray, and the larger the arrival angle, the greater the vertical particle velocity is, but the weaker the horizontal particle velocity is. Furthermore, the energy difference between horizontal particle velocity and vertical particle velocity can be approximately expressed by a monotonic function of the arrival angle, which varies fast with the horizontal distance between source and receiver. This property is applied to the estimation of source range. The analysis of the experimental data shows that the estimated source ranges are consistent with the GPS ranges within the range of 8 km, and the mean relative error of source range estimation is within 10%.
Keywords: vector sensor/
direct-arrival zone in deep water/
propagation property/
range estimation
