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Parallel relatively prime array space-time expansion-based two-dimensional direction of arrival estimation method

A technology of direction estimation and two-dimensional waves, which is applied in the direction of radio wave director parts, direction finders using radio waves, etc.

Active Publication Date: 2019-10-01
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0004] Although the method in the above literature [1] virtually expands the coprime array, it only uses part of the spatial information to construct the virtual array. If all the time-spatial information can be used, more virtual array elements can be obtained number, then the array aperture and degrees of freedom will be further increased, and the DOA estimation will be more accurate

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  • Parallel relatively prime array space-time expansion-based two-dimensional direction of arrival estimation method
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  • Parallel relatively prime array space-time expansion-based two-dimensional direction of arrival estimation method

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[0057] The implementation of the present invention will be further described in detail below in conjunction with the implementation examples and accompanying drawings, but the implementation of the present invention is not limited thereto. It can be understood or realized with reference to the prior art.

[0058] 1. The array structure of this embodiment

[0059] The array structure based on coprime array expansion provided by the present invention is as figure 2 As shown, the array structure includes a parallel coprime array and two separate array elements. The coprime parallel array consists of two horizontal uniform linear arrays, and the uniform linear arrays have M 1 , M 2 elements, and M 1 with M 2 Mutual prime. The array element spacing of line array 1 is λ represents the wavelength of the signal, and the element spacing of the line array 2 is The distance between the two subarrays is Use the coordinate system to illustrate the relative position of each arr...

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Abstract

The invention provides a parallel relatively prime array space-time expansion-based two-dimensional direction of arrival estimation method. The method comprises the steps of selecting and adding a special reference array element so that mutual correlation is performed o the reference array element by a sub-array of a relatively prime array to obtain correlation functions of different time lag andtake the self-correlation function as new receiving data; and performing pseudo-sampling to obtain a pseudo-data matrix by the new receiving data, vectorizing the pseudo-data matrix, converting a problem to a sparse optimization problem, and performing solving to obtain two-dimensional direction of arrival of a signal. The time-space information of the receiving data is fully utilized, a virtual array is expanded to the maximum extent, larger array aperture and higher freedom are achieved, and the direction of arrival estimation performance is better.

Description

technical field [0001] The invention relates to the field of array signal processing, in particular to a two-dimensional DOA estimation method based on parallel coprime array space-time expansion. Background technique [0002] Array signal processing technology has been widely used in many fields, and one of the basic problems of array signal processing is the direction of arrival (DOA estimation) of space signals. This technology is widely used and plays an increasingly important role in communication, radar and other fields. In the past few decades, people have continuously proposed a series of efficient [0003] DOA estimation algorithm. In recent years, with the continuous maturity and wide application of compressive sensing theory, the DOA estimation algorithm based on sparse reconstruction technology has received more attention and research. When using a uniform linear array to estimate the direction of arrival of a signal, the degree of freedom of the array is dire...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/10
CPCG01S3/10Y02D30/70
Inventor 李杰曾伟
Owner SOUTH CHINA UNIV OF TECH
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