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Non-circular signal-based nonporous co-prime array design method

A design method and technology for non-circular signals, which are applied in directions such as radio wave direction/bias determination systems, direction-determining directional devices, radio wave measurement systems, etc., to achieve the effect of improving degrees of freedom and increasing estimation accuracy

Pending Publication Date: 2022-06-10
HARBIN UNIV OF SCI & TECH
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Problems solved by technology

[0004] The technical problem solved by the present invention is: Aiming at the DOA estimation problem of the existing model, a non-porous virtual array design method is proposed to realize efficient DOA estimation

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  • Non-circular signal-based nonporous co-prime array design method

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specific embodiment

[0056]now combined with figure 2 ——4 The present invention is described in further detail.

[0057] A physical array using the number of array elements Q=M+N-1=6, wherein M=2, N=5, Sub-array 1 contains N physical array elements with a spacing of Md, and sub-array 2 contains M physical array elements with a spacing of The physical array element, the physical array element arrangement position is {0,2,4,6,8,9}. Taking advantage of the non-circular signal ellipse covariance is not 0, the range of virtual array elements of difference common array and summation common array is [-18,18], and the continuous degree of freedom of virtual array is 37.

[0058] Simulation 1: 3 non-circular incident sources are evenly distributed at [-20°, 20°], the signal-to-noise ratio is -5dB, and the snapshot is 500. Depend on figure 2 It can be seen that the model designed in the present invention provides higher virtual array elements, compared with the spatial spectra ...

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Abstract

The invention discloses a nonporous co-prime array design method based on non-circular signals, and belongs to the field of array signal processing. Comprising the following steps: rearranging and designing two groups of sub-arrays of an original co-prime array to construct a novel co-prime array; based on the characteristic that the ellipse covariance of the non-circular signal is not zero, calculating a differential common array, a summation common array and a continuous degree of freedom of the novel co-prime array; the method comprises the following steps: performing spatial sampling on a target signal source, calculating a covariance matrix of a novel array receiving signal, and vectorizing the covariance matrix; constructing a selection matrix, and extracting non-zero elements in the vectorization matrix; and high-precision DOA estimation of a target signal source is realized by using a MUSIC algorithm.

Description

technical field [0001] The invention relates to the field of target detection and signal processing, in particular to a method for designing a non-porous coprime array for non-circular signal DOA (Direction of arrival) estimation. Background technique [0002] Under the wave of new technological revolution, the rapid development of modern technical means such as hypersonic targets, sonar radar signal detection, and complex electronic countermeasures has brought severe challenges to the existing space and security prevention and control fields. Therefore, using the new array design theory to carry out multi-target DOA estimation algorithm research to achieve fast and effective positioning of enemy targets has important practical significance for the field of space and security prevention and control. [0003] Compared with uniform linear arrays, sparse arrays have larger virtual delays, higher degrees of freedom, and weaker mutual coupling effects, which greatly improve the e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/04G01S3/10G01S3/14G01S3/781G01S3/782G01S3/801G01S3/802G06F17/16
CPCG01S3/043G01S3/10G01S3/14G01S3/781G01S3/782G01S3/801G01S3/802G06F17/16
Inventor 刘可李巍
Owner HARBIN UNIV OF SCI & TECH