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Wideband signal doa estimation method based on coprime array

A wide-band signal and DOA technology, which is applied in the direction of orientators, instruments, measuring devices, etc., can solve the problems of low precision and large error of direction measurement

Active Publication Date: 2021-04-02
东北大学秦皇岛分校
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Problems solved by technology

[0005] The object of the present invention is to provide a method for estimating DOA of wideband signals based on coprime arrays, which can effectively solve the problems in the prior art, especially in the case of low signal-to-noise ratio. The problem of large error and low precision

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  • Wideband signal doa estimation method based on coprime array
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  • Wideband signal doa estimation method based on coprime array

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experiment example

[0125] Experimental example: a wideband signal DOA estimation method based on a coprime array, including the following steps:

[0126] S1, using the antenna to design a coprime array structure, each antenna is called an array element; specifically, the coprime array can be designed by the following method (such as figure 2 shown):

[0127] (1) Use N antennas to form a uniform linear array 1, referred to as line array 1; use M-1 antennas to form a uniform linear array 2, referred to as line array 2; wherein, the array element spacing of line array 1 is Md, and line array 2 The array element spacing is Nd, N>M≥2 and M and N are coprime, 0<d≤λ / 2, λ is the wavelength of the broadband signal incident to the coprime array;

[0128] (2) Combining line array 1 and line array 2 into a coprime array: set the first element of line array 1 as element 0 of the coprime array, and place the first element of line array 2 in the same array The positions at a distance of Nd from 0 are proces...

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Abstract

The invention discloses a wideband signal DOA estimation method based on a coprime array, comprising: S1, designing a coprime array structure by using an antenna; S2, sampling and discrete Fourier transforming the wideband signal received by the antenna in the coprime array Transform to obtain the frequency domain signal output model; S3, calculate the autocorrelation matrix of the frequency domain signal output model and vectorize it to obtain a new signal model; S4, process the new signal model to obtain the spatial smoothing coherence of the wideband signal Variance matrix; S5, dividing the airspace network, constructing a dictionary, and using the dictionary at multiple frequency points of the broadband signal to perform sparse representation of the spatial smooth covariance matrix, forming a multi-measurement vector sparse representation model of multiple dictionaries of the broadband signal ; S6, realize the DOA estimation of broadband signals in the form of solving the sparse inverse problem through the joint sparse constraints on the multi-dictionary sparse representation coefficients. The invention can improve the estimation accuracy of the direction angle of the broadband signal under the low signal-to-noise ratio, and reduce the direction-finding error.

Description

technical field [0001] The invention relates to a wideband signal DOA estimation method based on a coprime array, which belongs to the field of array signal processing. 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 of broadband array signals has always been an interesting problem in the field of array signal processing, and has many applications in radar, communication, smart antenna and passive positioning. The existing broadband DOA estimation methods are mainly divided into two categories: one is the maximum likelihood (ML) parameter estimation method, which not only needs to know or pre-estimate the number of sources, but also requires Functions often exhibit multi-peak characteristics, and the global convergence is poor. The process of solving it requires multi-dimensional search, and the amount of calculation is large; another type of algorith...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/48
CPCG01S3/48
Inventor 刘福来成雅剑杜瑞燕
Owner 东北大学秦皇岛分校
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