Near-field target sound source three-dimensional passive positioning method

Abstract

The invention discloses a near-field target sound source three-dimensional passive positioning method. In a situation where the depth of a target is unknown, the three-dimensional position of the target is obtained on the basis of a one-dimensional horizontal line array through the multi-path features of an underwater sound channel. The method includes the following steps: putting an array under the sea, receiving a radiation signal of a target sound source in an underwater sound field, and performing amplification filtering, data acquisition and storage; defining a scan plane of multiple depths underwater, and dividing grids for a scan area; finding a false target; obtaining a coordinate x0 of the target sound source in an x-axis direction; constructing a guiding vector a (r); calculating a guiding vector (r) through the MVDR direction estimation principle; and obtaining a three-dimensional coordinate value of the target sound source. The one-dimensional array is utilized to solve the three-dimensional positioning problem in the target sound source, and the positioning precision is improved since a focusing wave beam forming technology and the MVDR principle are combined creatively.

Description

technical field [0001] The invention belongs to the field of underwater acoustic passive positioning, specifically relates to the principle and method of focused beam forming and MVDR, and is suitable for the passive measurement of the three-dimensional position of a target by a horizontal line array under near-field multi-path conditions. Background technique [0002] Typically, active ranging techniques are used for far-field targets and passive ranging techniques are used for near-field targets. Since active sonar has the problem of self-exposure, it is very unfavorable for attack submarines. General ranging methods include spherical wave method, ternary array method and focused beamforming method, etc. The spherical wave method is essentially similar to the ternary array method, which uses the time delay estimation and azimuth information between the two arrays before and after to obtain the azimuth and distance of the target. The traditional three-element array method...

AI Technical Summary

Problems solved by technology

However, due to the limitation of the one-dimensional line array, the two-dimensional coordinate information of the target can be obtained at most.

And under near-field conditions, the use of the MVRD method suitable for far-field azimuth estimation is equivalent to distorting the formation, that is, the traditional MVDR principle cannot be applied to the estimation of near-field target azimuth

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