Inhomogeneous sensor array broadband signal direction-of-arrival estimation method

Abstract

The present invention discloses an inhomogeneous sensor array broadband signal direction-of-arrival (DOA) estimation method. The method comprises the following steps of: S1, performing sliding windowfast Fourier transform of a sample sequence in an inhomogeneous sensor array, and constructing an actual value weighting sample covariance vector yl; S2, constructing a corresponding over-complete array flow-pattern matrix [Phi]l; S3, employing the actual value weighting sample covariance vector yl and the over-complete array flow-pattern matrix [Phi]l to set an initial value [gamma]init of a space joint sparse representation vector [gamma] and an initial value [lambda]init of a regularization parameter [lambda]; S4, employing the actual value weighting sample covariance vector yl and the over-complete array flow-pattern matrix [Phi]l to update the space joint sparse representation vector [gamma] and the regularization parameter [lambda]; S5, when the [gamma] obtained through the ith iteration and the [gamma]<i+1> obtained through the (i+1)the iteration meet ||[gamma]-[gamma]<i+1>||2/||[gamma]||2<[alpha] or achieve the maximum iteration times Pmax, stopping the iteration, or else, returning the step S4; and S6, searching all the peak values of the space joint sparse representation vector [gamma], and outputting DO estimation values of the broadband signals.

Description

technical field [0001] The invention relates to the field of array signal processing, in particular to a method for estimating the direction of arrival of a broadband signal of a non-uniform sensor array. Background technique [0002] Broadband signals have the characteristics of strong anti-interference ability, complex modulation patterns, and large amount of information. They are widely used in the fields of radar, communication, electronic countermeasures and reconnaissance. At the same time, most of the natural signals that can be received in nature are broadband signals. , so the problem of estimating the direction of arrival (Direction-of-Arrival, DOA) of the broadband signal is attracting increasing attention. [0003] In recent years, the increasingly complex and changeable electromagnetic environment has led to an increase in the number of incoming signals, and the underdetermined situation in which the number of incoming signals is greater than the number of array...

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Problems solved by technology

However, in its hierarchical Bayesian model, the method commonly used in convex optimization-based methods for multi-band joint sparse constraints Norm modeling, so its performance will be affected in the case of low signal-to-noise ratio or small number of sampling points

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