中国物理B ›› 2016, Vol. 25 ›› Issue (12): 124311-124311.doi: 10.1088/1674-1056/25/12/124311

• SPECIAL TOPIC—Acoustics • 上一篇    下一篇

Bearing splitting and near-surface source ranging in the direct zone of deep water

Jun-Nan Wu(吴俊楠), Shi-Hong Zhou(周士弘), Zhao-Hui Peng(彭朝晖), Yan Zhang(张岩), Ren-He Zhang(张仁和)   

  1. 1. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;
    2. College of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2016-05-01 修回日期:2016-09-01 出版日期:2016-12-05 发布日期:2016-12-05
  • 通讯作者: Shi-Hong Zhou E-mail:shih_zhou@mail.ioa.ac.cn

Bearing splitting and near-surface source ranging in the direct zone of deep water

Jun-Nan Wu(吴俊楠)1,2, Shi-Hong Zhou(周士弘)1, Zhao-Hui Peng(彭朝晖)1, Yan Zhang(张岩)1, Ren-He Zhang(张仁和)1   

  1. 1. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China;
    2. College of Physics, University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2016-05-01 Revised:2016-09-01 Online:2016-12-05 Published:2016-12-05
  • Contact: Shi-Hong Zhou E-mail:shih_zhou@mail.ioa.ac.cn

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摘要：

Sound multipath propagation is very important for target localization and identification in different acoustical zones of deep water. In order to distinguish the multipath characteristics in deep water, the Northwest Pacific Acoustic Experiment was conducted in 2015. A low-frequency horizontal line array towed at the depth of around 150 m on a receiving ship was used to receive the noise radiated by the source ship. During this experiment, a bearing-splitting phenomenon in the direct zone was observed through conventional beamforming of the horizontal line array within the frequency band 160 Hz-360 Hz. In this paper, this phenomenon is explained based on ray theory. In principle, the received signal in the direct zone of deep water arrives from two general paths including a direct one and bottom bounced one, which vary considerably in arrival angles. The split bearings correspond to the contributions of these two paths. The bearing-splitting phenomenon is demonstrated by numerical simulations of the bearing-time records and experimental results, and they are well consistent with each other. Then a near-surface source ranging approach based on the arrival angles of direct path and bottom bounced path in the direct zone is presented as an application of bearing splitting and is verified by experimental results. Finally, the applicability of the proposed ranging approach for an underwater source within several hundred meters in depth in the direct zone is also analyzed and demonstrated by simulations.

关键词: direct zone, deep water, bearing splitting, near-surface source ranging

Abstract:

Sound multipath propagation is very important for target localization and identification in different acoustical zones of deep water. In order to distinguish the multipath characteristics in deep water, the Northwest Pacific Acoustic Experiment was conducted in 2015. A low-frequency horizontal line array towed at the depth of around 150 m on a receiving ship was used to receive the noise radiated by the source ship. During this experiment, a bearing-splitting phenomenon in the direct zone was observed through conventional beamforming of the horizontal line array within the frequency band 160 Hz-360 Hz. In this paper, this phenomenon is explained based on ray theory. In principle, the received signal in the direct zone of deep water arrives from two general paths including a direct one and bottom bounced one, which vary considerably in arrival angles. The split bearings correspond to the contributions of these two paths. The bearing-splitting phenomenon is demonstrated by numerical simulations of the bearing-time records and experimental results, and they are well consistent with each other. Then a near-surface source ranging approach based on the arrival angles of direct path and bottom bounced path in the direct zone is presented as an application of bearing splitting and is verified by experimental results. Finally, the applicability of the proposed ranging approach for an underwater source within several hundred meters in depth in the direct zone is also analyzed and demonstrated by simulations.

Key words: direct zone, deep water, bearing splitting, near-surface source ranging

中图分类号:  (Ray propagation of sound in water)

  • 43.30.Cq
43.60.Fg (Acoustic array systems and processing, beam-forming) 43.60.Jn (Source localization and parameter estimation)