Near-field three-dimensional passive positioning method based on horizontal line array

A passive positioning and linear array technology, applied in positioning, radio wave measurement systems, measuring devices, etc., can solve problems such as difficult to obtain target depth coordinates, and achieve the effect of high-precision three-dimensional passive positioning

Inactive Publication Date: 2014-05-14
HARBIN ENG UNIV
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Problems solved by technology

In the above methods, the positioning is carried out on the premise that the depth coordinates are known, but in practical applications, it is difficult to obtain accurate target depth coordinates, and the impact of depth errors on the positioning results cannot be ignored

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  • Near-field three-dimensional passive positioning method based on horizontal line array
  • Near-field three-dimensional passive positioning method based on horizontal line array
  • Near-field three-dimensional passive positioning method based on horizontal line array

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Embodiment Construction

[0027] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0028] (1) figure 1 Flow chart for targeting. Set target S 0 depth z 0 , the sea depth is H, and the horizontal line array is placed on the seabed along the x-axis direction, such as figure 2 shown in . S 0 ' for S 0 Regarding the virtual source on the sea surface, the radiation signal is s(t); the speed of sound is c, and the reflection coefficient of the sea surface is -0.9. The distance from the target to the i array element is R ic , virtual source S 0 'The distance to array element i is R ic ', only considering the direct sound and a sea surface reflection, the received signal of each array element under the condition of spherical wave attenuation is:

[0029] r i ( t ) = 1 R ic s ...

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Abstract

The invention belongs to the field of acoustic positioning and particularly relates to a near-field three-dimensional passive positioning method based on a horizontal line array. The near-field three-dimensional passive positioning method based on the horizontal line array comprises the steps that that the horizontal line array is adopted, the array is fixedly distributed on the flat seabed, radiation signals of a target acoustic source in an underwater sound field are received, amplification and filtering are conducted, and data collection is conducted; the orientation of a target is measured roughly; according to scanning points, time-delay compensation and superposition are conducted on incoming wave signals received by each array element in each scanned area, so that obtained focused beams are formed and output; the power of each sound signal which is obtained after superposition is worked out, the power value of each point in the scanned area is output on a sound image; a measured area is scanned precisely; the coordinates of two bright spots in the scanned area are determined; the three-dimensional coordinates of the target acoustic source are solved reversely through post-processing. The near-field three-dimensional passive positioning method based on the horizontal line array is based on the focused beam forming theory and method, no prior knowledge is needed, and high-precision three-dimensional passive positioning of a shallow sea short-range target can be achieved, wherein the positioning error within 400 m is smaller than 0.5 m.

Description

technical field [0001] The invention belongs to the field of underwater acoustic positioning, and in particular relates to a near-field three-dimensional passive positioning method based on a horizontal linear array. Background technique [0002] The underwater acoustic positioning technology is an important and basic problem in the underwater acoustic technology. The passive acoustic positioning in shallow sea water is of great significance in both military affairs and marine research. Common underwater passive positioning methods include three-subarray positioning, target motion analysis (TMA) and matching field processing (MFP) (see literature [1]: Mao Weining. Review and prospect of underwater passive positioning methods. Journal of Southeast University, 2001, 31(6):129-132). The simplification of the propagation model makes the three-subarray method have great limitations in theory and practical application; the target motion analysis (TMA) method is relatively mature,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/20
CPCG01S5/20
Inventor 惠娟牛芳梁国龙孙辉吴一飞李茂震张凤园段海旭王硕
Owner HARBIN ENG UNIV
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