Research on reliable acoustic path: Physical properties and a source localization method

doi:10.1088/1674-1056/21/12/124301

Abstract The physical properties of the reliable acoustic path (RAP) are analysed and subsequently a weighted-subspace-fitting matched field (WSF-MF) method for passive localization is presented by exploiting the properties of the RAP environment. The RAP is an important acoustic duct in the deep ocean, which occurs when the receiver is placed near bottom where the sound velocity exceeds the maximum sound velocity in the vicinity of the surface. It is found that in the RAP environment the transmission loss is rather low and no blind zone of surveillance exists in a medium range. The ray theory is used to explain these phenomena. Furthermore, the analysis of the arrival structures shows that the source localization method based on arrival angle is feasible in this environment. However, the conventional methods suffer from the complicated and inaccurate estimation of the arrival angle. In this paper, a straightforward WSF-MF method is derived to exploit the information about the arrival angles indirectly. The method is to minimize the distance between the signal subspace and the spanned space by the array manifold in a finite range-depth space rather than the arrival-angle space. Simulations are performed to demonstrate the features of the method, and the results are explained by the arrival structures in the RAP environment.

Keywords: reliable acoustic path multipath arrival structure source localization

Received: 22 March 2012
Revised: 12 June 2012
Accepted manuscript online:

PACS:	43.30.Cq	(Ray propagation of sound in water)
	43.30.Wi	(Passive sonar systems and algorithms, matched field processing in underwater acoustics)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11174235 and 61101192), the Science and Technology Development Project of Shaanxi Province, China (Grant No. 2010KJXX-02), the Program for New Century Excellent Talents in University, China (Grant No. NCET-08-0455), the Foundation of State Key Lab of Acoustics, China (Grant No. SKLOA201101), and the Doctorate Foundation of Northwestern Polytechnical University, China (Grant No. CX201226).

Corresponding Authors: Yang Kun-De
E-mail: ykdzym@nwpu.edu.cn

Cite this article:

Duan Rui (段睿), Yang Kun-De (杨坤德), Ma Yuan-Liang (马远良), Lei Bo (雷波) Research on reliable acoustic path: Physical properties and a source localization method 2012 Chin. Phys. B 21 124301

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