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Mixed signal arrival direction estimation method based on co-prime array

A direction of arrival estimation and mixed-signal technology, applied in the field of signal processing, to achieve the effects of improving accuracy, increasing degrees of freedom, and improving noise suppression

Active Publication Date: 2020-03-27
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The traditional direction of arrival estimation method can only solve the situation where the number of targets is less than the number of array elements, so how to detect more targets with a small number of array elements has become a new challenge

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  • Mixed signal arrival direction estimation method based on co-prime array

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Embodiment Construction

[0033] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0034] Such as figure 1 , a mixed-signal direction-of-arrival estimation method based on a coprime array, including the following steps:

[0035] The system server needs to collect the array element distribution information of the antenna coprime array at the receiving end and roughly estimate the number of sources of the signal in advance;

[0036] The system server needs to expand the dimension of the received signal, and at the same time use the information carried by the received signal itself and its conjugate;

[0037] The system server needs to reconstruct the autocorrelation matrix of the expanded signal into a vector for spatial smoothing;

[0038] The system server needs to perform eigendecomposition on the covariance matrix obtained after spatial smoothing, ...

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Abstract

The invention discloses a mixed signal arrival direction estimation method based on a co-prime array, and the method comprises the following steps: collecting the array element distribution information of a receiving end antenna co-prime array, and roughly estimating the number of signal sources; carrying out dimension expansion on the received signal by utilizing the circularity and non-circularity characteristics of the transmitted signal, calculating an autocorrelation matrix of the dimension expansion signal, and reconstructing the autocorrelation matrix into a vector; estimating a signalarrival direction by utilizing a covariance matrix obtained after spatial smoothing; taking out a plurality of estimation directions with the best estimation performance, and estimating the corresponding signal power; and calculating an autocorrelation matrix of the original received signal, reconstructing the autocorrelation matrix into a vector, deleting components corresponding to the non-cyclic signal from the vector, and estimating the direction of arrival of the cyclic signal through spatial smoothing operation and by using a MUSIC algorithm on the obtained covariance matrix. According to the invention, the array performance can be further enhanced, and more signal sources can be distinguished by fewer array elements.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method for estimating the direction of arrival of mixed signals based on coprime arrays. Background technique [0002] Array signal processing technology is widely used in national defense and every aspect of people's life. Direction of Arrival (DOA) estimation is an important problem in the field of array signal processing, and has many applications in radar, sonar, wireless communication, smart antenna and passive positioning. The traditional direction of arrival estimation method can only solve the situation where the number of targets is less than the number of array elements, so how to detect more targets with a small number of array elements has become a new challenge. [0003] In recent years, a linear array with a new geometric structure—coprime array has been proposed, which can achieve an estimated number of DOAs far exceeding the number of array elements. Due to th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/14G06F17/16
CPCG01S3/14G06F17/16Y02D30/70
Inventor 丁跃华李冰莹
Owner SOUTH CHINA UNIV OF TECH
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