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
CN101051083AInactive Publication Date: 2007-10-10INST OF ACOUSTICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
INST OF ACOUSTICS CHINESE ACAD OF SCI
Publication Date
2007-10-10
Estimated Expiration
Not applicable · inactive patent

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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.
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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, ...

Claims

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