Non-circular signal azimuth estimation method under unknown mutual coupling condition of uniform circular array

Abstract

The invention provides a non-circular signal azimuth estimation method under an unknown mutual coupling condition of a uniform circular array. The method comprises the steps of constructing a mutual coupling coefficient matrix of the uniform circular array, obtaining an output signal model, solving a fourth-order cumulant matrix, performing singular value decomposition on the fourth-order cumulantmatrix, and solving a signal subspace and a noise subspace; performing matrix-vector transformation on the steering vector, finally obtaining a spatial spectrum by utilizing orthogonality between thesteering vector and a noise subspace, performing rank reduction decomposition operation on the spatial spectrum, performing one-dimensional spectrum peak search on an azimuth angle in the spatial spectrum, finding out a wave direction angle, and achieving the purpose of direction finding. According to the method, matrix rank reduction decomposition transformation operation is adopted, the searchdimension is reduced, the operation complexity is reduced, engineering implementation is facilitated, and the real-time performance is high.

Description

technical field [0001] The invention relates to the field of array signal processing, in particular to a method for estimating noncircular signals. Background technique [0002] Direction-of-arrival (DOA) estimation technology is an important research direction in the field of array signal processing. In recent decades, super-resolution DOA estimation technology has been widely used in the fields of radar, sonar and communication because of its superior performance. With the rapid development of modern wireless communication systems, common signals such as BPSK, PAM, and ASK all have non-circular characteristics. Therefore, the DOA direction-finding algorithm for non-circular signals has received more and more attention in the field of array signal processing. Using the non-circular characteristics of the signal, the array can obtain a larger virtual aperture, thereby being able to detect more signal sources. And improve the direction finding accuracy. [0003] However, m...

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Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art and solve the defects of the prior art on the estimation of the azimuth angle in the uniform circular array affected by unknown mutual coupling, such as low accuracy of the estimated angle and a small number of estimated signal sources, the present invention provides a uniform Azimuth Estimation Method for Non-circular Signals under Unknown Mutual Coupling Condition of Circular Array

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