Taylor expansion-based augmented co-prime array rapid DOA estimation method

A technology of DOA and array, applied in the field of fast DOA estimation of augmented coprime array based on Taylor expansion, can solve the problems of low precision and high complexity

Pending Publication Date: 2021-09-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies in the prior art, to provide a fast DOA estimation method based on Taylor expansion augmented coprime arrays, to solve the problem of high complexity and low precision in the fine estimation process of the traditional DFT algor

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  • Taylor expansion-based augmented co-prime array rapid DOA estimation method
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  • Taylor expansion-based augmented co-prime array rapid DOA estimation method

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Embodiment Construction

[0058] Below in conjunction with accompanying drawing and specific embodiment the technical solution of the present invention is described in further detail:

[0059] This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.

[0060] The detailed process of a fast DOA estimation method for augmented coprime arrays based on Taylor expansion provided by the present invention is as follows: figure 1 As shown, the antenna array is set up, and the received signal is sampled through the augmented coprime array; the covariance matrix of the received signal is calculated and vectorized, and the vectorized covariance matrix is ​​sorted to remove the non-continuous After the redundant par...

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Abstract

The invention discloses a Taylor expansion-based augmented co-prime array rapid DOA estimation method, which is characterized in that DFT spectrum coarse estimation and Taylor expansion fine estimation are combined to process virtualized signals so as to achieve rapid DOA estimation. The method comprises the following steps: sampling a received signal through an augmented co-prime array, calculating a covariance matrix of the received signal, and carrying out vectorization operation and redundancy elimination operation on the covariance matrix to obtain a received signal of a virtualized uniform array; carrying out DOA coarse estimation through a DFT spectrum search method; and finally carrying out accurate DOA estimation through a Taylor expansion method. The method has the advantages that a complex phase search process in a traditional DFT method fine estimation process can be effectively avoided, a DFT coarse estimation result is directly substituted into a Taylor expansion to solve high-precision DOA estimation, and the calculation cost is lower; and when the array size is large, DOA estimation with higher precision than that of a traditional DFT method can be obtained, and the method has important practical value.

Description

technical field [0001] The invention relates to the technical field of array signal processing, in particular to a fast DOA estimation method for an augmented coprime array based on Taylor expansion. Background technique [0002] Due to the advantages of strong anti-interference ability, high signal gain, and strong direction resolution, array signal processing has developed rapidly in the past two decades, and has been widely used in many fields such as radar, communication, satellite navigation, and sonar. Array signal processing mainly studies adaptive beamforming and high-resolution direction of arrival (DOA). Traditional DOA estimation methods, such as MUSIC method and ESPRIT algorithm, etc., when the array size is relatively large, the algorithm complexity is relatively high, and if it is directly applied in a sparse array, it will fail because the array element spacing is greater than half the wavelength of the incident signal. [0003] The augmented coprime array is...

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Application Information

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IPC IPC(8): G01S3/14G06F17/16
CPCG01S3/143G06F17/16
Inventor 曾浩威赖欣张小飞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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