Array structure design method applied to expanded co-prime linear array

Abstract

The invention discloses an array structure design method applied to an expanded co-prime linear array. The method comprises the following steps of 1, establishing an array structure model and a signal model of the expanded co-prime linear array; 2, deducing to obtain that no fuzzy angle is generated when only two incident signals exist; 3, deducing to obtain that a fuzzy angle is generated when a third incident signal exists and the sine value of the third incident signal is equal to the respective direction vectors of the other two angles; 4, establishing a new co-prime array structure to obtain a new signal model, and reconstructing a direction vector of a new co-prime array; 5, calculating a new covariance matrix of a co-prime array signal, and carrying out eigenvalue decomposition on the covariance matrix; 6, constructing a spectrum peak search function; and 7, breaking the relationship between the direction vector of the reconstructed new co-prime array and the spectral peak search function, and eliminating the fuzzy angle to obtain a final angle estimation value. According to the present invention, the generation of the fuzzy angle can be solved only through the improvement of the array structure, and no extra algorithm is needed to eliminate the fuzzy angle.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an array structure design method applied to a coprime linear array. Background technique [0002] In traditional Direction of Arrival (DOA) estimation algorithms, uniform arrays are often used, and the distance between array elements is required to be no greater than half a wavelength to avoid angular ambiguity. However, at this time, there are shortcomings such as serious mutual coupling between adjacent array elements, small array aperture, poor resolution and low direction finding accuracy, and cannot meet the actual environmental requirements. [0003] The coprime array, because it breaks the traditional limitation that the array element spacing is not greater than half the wavelength, obtains a larger array aperture by designing the array element spacing to be greater than half the wavelength. In the case of a given number of array elements, compared with traditional ...

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Problems solved by technology

[0004] In order to solve the above-mentioned problems existing in the prior art, the object of the present invention is to provide an array structure design method applied to the unfolded coprime linear array, which solves the problem that the incident angle can be eliminated by changing the array under the condition that the incident angle satisfies a certain relationship. The phenomenon of angle ambiguity does not need to use other algorithms, which improves the convenience in the process of angle estimation and makes it more practical

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