Nested L-shaped antenna array structure and direction of arrival estimation method thereof

Abstract

The invention relates to a nested L-shaped antenna array structure and a direction of arrival estimation method thereof. The direction of arrival estimation method includes the following steps that: a nested L-shaped antenna array structure is constructed, and the received signals of a physical array antenna structure is determined based on the nested L-shaped antenna array structure; the high-order cumulant matrix of the received signals of the physical array antenna structure is obtained through using a high-order cumulant DOA algorithm; vectorization calculation is performed on the high-order cumulant matrix, so that a vectorized high-order cumulant matrix can be obtained, and the information of maximum continuous virtual square matrixes is extracted, and equivalent received signals can be obtained; two-dimensional spatial smoothing processing is performed on the equivalent received signals, so that an equivalent autocorrelation matrix can be obtained, eigenvalue decomposition is performed on the equivalent autocorrelation matrix, so that a signal feature vector matrix and a noise feature vector matrix can be obtained; and the signal feature vector matrix and the noise feature vector matrix are utilized to construct a spectral peak searching relational expression, and direction of arrival estimation is carried out, and the estimated value of the direction of arrival of the received signals is obtained. According to the nested L-shaped antenna array structure and the direction of arrival estimation method thereof adopted, a larger effective aperture can be realized when few array elements are adopted, and direction of arrival estimation precision can be improved.

Description

technical field [0001] The invention relates to the structure of an antenna array and a two-dimensional direction-of-arrival estimation technique, in particular to a nested L-shaped antenna array structure and a direction-of-arrival estimation method thereof. Background technique [0002] In the past two decades, many DOA estimation methods based on high-order cumulant array processing for non-Gaussian sources have developed rapidly, among which methods based on fourth-order cumulants are the most typical. Compared with the second-order statistic method, the fourth-order cumulant DOA estimation method has the following advantages: 1) It can handle more statistically independent non-Gaussian sources than the number of physical array elements; 2) Expand the array aperture; 3 ) suppresses Gaussian noise; 4) has higher estimation accuracy. In order to further increase the number of virtual array elements and improve the estimation accuracy, Pascal Chevalier, Laurent Albera et a...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a nested L-shaped antenna array structure and its method for estimating the direction of arrival, so as to make up for the shortcomings of the prior art that the number of estimable sources is small and the estimation accuracy is low for the limited number of array elements.

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