Broadband signal DOA estimation method based on co-prime array

Abstract

The invention discloses a broadband signal DOA estimation method based on a co-prime array, and the method comprises the steps: S1, designing a co-prime array structure through an antenna; S2, carrying out the sampling and discrete Fourier transform of a broadband signal received by an antenna in the co-prime array, and obtaining a frequency domain signal output model; S3, calculating an autocorrelation matrix of the frequency domain signal output model, carrying out the vectorization of the frequency domain signal output model, and obtaining a new signal model; S4, carrying out the processing of the new signal model, and obtaining a spatial smooth covariance matrix of the broadband signal; Sa5, dividing a space domain grid, constructing a dictionary, carrying out the sparse representation of the spatial smooth covariance matrix through employing the dictionaries of a plurality of frequency points of the broadband signal, and forming a multi-measurement-vector sparse representation model of a plurality of dictionaries of the broadband signal; S6, achieving the arrival direction estimation of the broadband signal in a mode of solving a sparse inverse problem through the joint sparse constraint of the sparse representation coefficients of the plurality of dictionaries. The method can improve the estimation precision of the direction angle of the broadband signal under the condition of low signal to noise ratio, and reduces 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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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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