Azimuth Estimation Method for Broadband Coherent Source of Acoustic Vector Circular Array Based on Vector Singular Value Decomposition

Abstract

The invention provides a direction-of-arrival estimation method for an acoustic vector circular array broadband coherent source based on vector singular value decomposition. The direction-of-arrival estimation method comprises the steps of acquiring frequency domain signals of each sub-band by using a sub-band decomposition principle; converting acoustic vector circular array frequency domain signals into modal-domain frequency domain signals; building a cross covariance matrix by adopting an acoustic pressure and vibration velocity joint processing mode, and realizing cross covariance matrix estimation for broadband receiving signals through sum averaging; performing eigenvalue decomposition on the cross covariance matrix , finding an eigenvector corresponding to the maximum eigenvalue to built a reconstruction matrix, increasing a reverse smoothing item so as to acquire a modified reconstruction matrix, and performing singular value decomposition to acquire a signal subspace and a noise subspace; and realizing direction-of-arrival estimation for an acoustic vector circular array broadband coherent target by using a MUSIC algorithm. The direction-of-arrival estimation method has higher noise suppression capacity, and has higher spatial resolving power than a vector singular decomposition method and forward-backward spatial smoothing under the condition of a low signal-to-noise ratio. The direction-of-arrival estimation method has high advantages on the aspect of remote detection for an underwater broadband target.

Description

technical field [0001] The invention relates to a sensor array signal processing method, in particular to an acoustic vector circular array broadband coherent target orientation estimation method. Background technique [0002] Underwater target radiation noise can be divided into line spectrum and broadband continuum. Compared with line spectrum, broadband continuum has the advantages of carrying a large amount of information and weak correlation with background noise, which is beneficial to target detection, parameter estimation and target feature extraction. However, when the correlation between targets in different directions is strong and the measurement distance is large, the performance of the orientation estimation algorithm will decrease. Therefore, it is of great engineering application value to carry out research on the azimuth estimation algorithm of underwater long-range broadband coherent sources. [0003] The acoustic vector sensor can obtain more sound field ...

AI Technical Summary

Problems solved by technology

Aiming at the problem of broadband azimuth estimation, in the patent document with the application number 201610532431.1 and titled "A method for estimating the azimuth of an acoustic vector circular array broadband coherent source", an acoustic vector circular array broadband focusing transformation method is proposed to realize the long-range broadband target azimuth estimation, but the decoherence algorithm is not introduced, and the target orientation cannot be effectively estimated in the case of strong signal coherence

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