Beam domain imaging method based on sub-array division

An imaging method and a technology of sub-array division, applied to a system for determining direction or offset, and a direction finder using ultrasonic/sonic/infrasonic waves, etc., can solve the problem of low DOA estimation accuracy, achieve good estimation performance, and improve signal quality. The effect of the noise ratio

Active Publication Date: 2019-05-17
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low DOA estimation accuracy in the presence of multi-channel signals or low signal-to-noise ratio at the far end of the existing imaging method when it is applied in high-resolution soun

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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] As shown in Figure 1 (a), a beam domain imaging method based on sub-array division, the method includes:

[0041] (1) The high-resolution depth-sounding side-scan sonar receiving system consists of multiple receiving arrays with half-wavelength spacing. The demodulation, filtering, and sampling results of the signal received by each receiving array can be regarded as the output of an array element. There are M receiving arrays in total, and the combination of these receiving arrays can be regarded as an array element The number is M, and the array element spacing is a uniform linear array of half wavelength. Consider that there are N angles of θ 1 ,...,θ N The far-field narrowband signal of is incident on the array, and the output obtained by the receiver at time t can be expressed as x(t)=As(t)+n(t), where A=[a(θ 1 ), a(θ 2 ),...,a(θ N )] represents an ...

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Abstract

The invention discloses a beam domain imaging method based on sub-array division. The method comprises the steps that step (1) the number and direction of target signal sources are estimated by usingan azimuth spectrum of a received signal of a uniform linear array; step (2) the uniform linear array is divided into a plurality of sub-arrays of the same size and overlapping one another, and the received signals of the sub-arrays are subjected to spatial filtering in a specified direction to obtain beamforming results of the sub-arrays; the beamforming results of the sub-arrays are treated as output of virtual elements, the virtual elements are combined to a virtual linear array and the output of the virtual linear array is calculated; and step (3) a high-resolution direction of arrival (DOA) estimation algorithm is used for realizing the estimation of the echo direction based on the output of the virtual linear array. The beam domain imaging method performs beamforming in the specifieddirection on the sub-arrays that is equivalent to spatial filtering of the signals, the signal intensity in the specified direction is enhanced while the interference of incoming waves in other directions is filtered out, and the signal-to-noise ratio is improved.

Description

technical field [0001] The invention belongs to the field of sonar signal processing, and in particular relates to a method for improving DOA estimation performance under the condition of multi-path signals or low signal-to-noise ratio of received signals, in particular to a beam domain imaging method based on subarray division. Background technique [0002] Internationally, since the 1970s, the depth-sounding side-scan sonar has been studied, and the signal processing methods used in the sounding are divided into three types. The first is the acoustic interference technology, which uses two parallel linear arrays. When the phase difference of the echoes received by the two linear arrays is 0 or π, the direction result can be obtained, but it has few sounding points and poor sounding accuracy. The second is the differential phase estimation technique, which uses two parallel linear arrays, can obtain hundreds of sounding points for each launch, and has the advantage of high ...

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Application Information

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IPC IPC(8): G01S3/808
Inventor 刘晓东姚琳曹金亮张东升王舒文王晏宾
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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