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Secondary wave arrival direction estimution sonar signal processing method

A direction estimation and signal processing technology, applied in the re-radiation of sound waves, radio wave measurement systems, and the use of re-radiation, etc., can solve the problem of low resolution of underwater targets detected by sonar arrays, and achieve high resolution of three-dimensional sound images. , the effect of improving the estimation accuracy

Inactive Publication Date: 2007-10-10
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] However, the disadvantages of the above-mentioned existing technologies are that in the existing sonar signal processing methods, only one-dimensional direction of arrival estimation is used for acoustic signal processing, and the other dimension is to use conventional beamforming technology, so that the sonar The resolution of detecting underwater targets with a sonar array is very low; in fact, when using a sonar array to detect underwater targets, acoustic signal processing for two-dimensional direction of arrival (DOA) estimation, plus the range axis, is required to obtain the underwater target high-resolution 3D audio

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  • Secondary wave arrival direction estimution sonar signal processing method
  • Secondary wave arrival direction estimution sonar signal processing method
  • Secondary wave arrival direction estimution sonar signal processing method

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[0040] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0041] There are many forms of centrosymmetric two-dimensional sonar arrays that can reproduce the present invention, and the number of sonar array elements should not be limited, and the number of sonar array elements can be increased or decreased in a two-dimensional centrosymmetric manner.

[0042] In this embodiment, the cross array in FIG. 2 is taken as an example to describe the two-dimensional DOA estimation sonar signal processing method of the present invention in detail. The present invention is applicable to all two-dimensional centrosymmetric two-dimensional sonar arrays, and those skilled in the art can apply the method to other forms of two-dimensional centrosymmetric sonar arrays according to the description of the embodiments.

[0043] Four sonar arrays as shown in Figure 1(a)-(d): rectangular, box-shaped, cross-shaped and circul...

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Abstract

A method for processing sonar signal of 2-D wave direction estimation includes revising phase outputted by base element; calculating correlation function estimation value of sonar array, carrying out character decomposition on said function estimation value; calculating first sub-array and correlation function estimation value of sub-array pair; carrying out character decomposition on said value of sub-array pair; calculating character vector estimation value of all sub-array pair, field angle estimation value of each object to sonar array two directions, etc and selecting two field angle estimation value corresponding to minimum variance estimation.

Description

technical field [0001] The invention relates to a two-dimensional high-resolution sonar signal processing method, in particular to a sonar signal processing method for obtaining underwater target orientation information by using two-dimensional direction of arrival (Direction of Arrival, hereinafter referred to as DOA) estimation. Background technique [0002] In the prior art, conventional beamforming techniques are generally used to form beams on a two-dimensional plane to obtain a three-dimensional sound image of a target. Conventional beamforming techniques are based on the Fudi transform, and its beam angular width is Δθ=λ / d, where λ is the wavelength and d is the maximum size of the sonar array. If you want to reduce the beam angle width Δθ and obtain high resolution, there are usually two methods. One method is to reduce the wavelength λ and increase the frequency, but shorten the operating distance; the other method is to increase the sonar The size d of the array, ...

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Application Information

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IPC IPC(8): G01S7/52G01S15/89
Inventor 朱维庆刘晓东张方生陈强刘光军
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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