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

A uniform circular array and non-circular signal technology, which can be applied to the orientation device for determining the direction, the direction finder using radio waves, the radio wave direction/deviation determination system, etc., which can solve the problem of low accuracy of estimated angle and small number of estimated signal sources And other issues

Pending Publication Date: 2020-07-03
NORTHWESTERN POLYTECHNICAL UNIV
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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 accur

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

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Embodiment Construction

[0081] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0082] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.

[0083] 1. Construct the output signal model of the uniform circular array, and obtain the output signal of the array under the non-circular signal excitation under the condition of mutual coupling.

[0084] 2. Find the extended fourth-order cumulant matrix of the output signal, and perform singular value decomposition on the matrix to obtain the signal subspace and noise subspace

[0085] 3. Using the spatial spectrum function of the orthogonal relationship between the noise subspace and the array flow pattern, the variable separation of the spa...

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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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Application Information

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IPC IPC(8): G01S3/14
CPCG01S3/143Y02D30/70
Inventor 谢坚邓均午王秋平汪跃先王伶张兆林杨欣韩闯宫延云陶明亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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