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Low-complexity joint estimation method of doa and polarization under nested electromagnetic vector array

An electromagnetic vector, low-complexity technology, used in radio wave measurement systems, measurement devices, direction-determining direction guides, etc., and can solve problems such as fewer polarization-sensitive arrays

Active Publication Date: 2020-08-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, scholars at home and abroad have little research on the application of polarization-sensitive arrays in nested arrays, especially in the application of nested L-arrays and electromagnetic vector sensors under low-complexity methods.

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  • Low-complexity joint estimation method of doa and polarization under nested electromagnetic vector array
  • Low-complexity joint estimation method of doa and polarization under nested electromagnetic vector array
  • Low-complexity joint estimation method of doa and polarization under nested electromagnetic vector array

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Embodiment Construction

[0090]The present invention will be further explained below in conjunction with the accompanying drawings. Symbol representation: use (·) in the present invention T Indicates the matrix transpose, (·) H Represents matrix conjugate transpose, ( ) * Represents matrix conjugation, capital letter X represents matrix, lowercase letter x( ) represents vector, I p Expressed as a P×P identity matrix, Represents the Kronecker product, ⊙ represents the Khatri-Rao product, diag(x) represents a diagonal matrix composed of elements in x, E{·} represents the expectation of the matrix, and angle(·) represents the phase angle operation.

[0091] A low-complexity DOA and polarization joint estimation method under an electromagnetic vector nested L array, comprising the following steps:

[0092] Step 1: vectorize the covariance matrix R of the received signal, and perform row transformation on the virtual signal r obtained after vectorization to obtain a new virtual signal r';

[0093] St...

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Abstract

The invention provides a low complexity DOA and polarization joint estimation method under an electromagnetic vector nested L array. An electromagnetic vector sensor array and the nested L array are combined. Through introducing a spatial smoothing technology, smoothing processing is performed on a continuous virtual area array obtained after nested L array vectorization so as to obtain a virtualreceiving signal covariance matrix possessing a full rank characteristic. After a characteristic value is decomposed, a subspace class algorithm PM algorithm is used to realize signal DOA and polarization Information joint estimation. The electromagnetic vector sensor array can obtain the arrival angle information of the signal and can obtain the polarization information of the signal. The methodhas an important application value in the array signal processing field. In the method of the invention, space spectrum search is not needed, algorithm complexity is low, an obtained DOA estimation angle can realize automatic matching, the application of the nested array provides great array aperture support, and the high degree of freedom of a space and better parameter estimation performance arepossessed.

Description

technical field [0001] The invention relates to a signal source positioning method under a vector sensor array, specifically an angle estimation method and a polarization parameter estimation method of a far-field signal source, and belongs to the field of array signal processing. Background technique [0002] As a newly proposed array structure, nested array has larger array aperture and higher degree of spatial freedom than traditional uniform array. A nested array with N sensors has O{N degrees of freedom 2}. After introducing the spatial smoothing technology to the nested array virtual receiving signal processing, the existing subspace-like DOA (Direction of Arrival, direction of arrival) estimation algorithm can be used to estimate the angle of the space target source, and the electromagnetic vector sensor array can not only obtain The angle parameter information of the space electromagnetic signal and the polarization information of the signal can be obtained, which ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/00G01S5/00
CPCG01S3/00G01S5/00
Inventor 林新平张小飞何浪周梦婕
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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