Localisation of mixed near-field and far-field sources using the largest aperture sparse linear array

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Localisation of mixed near-field and far-field sources using the largest aperture sparse linear array

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© The Institution of Engineering and Technology
Received 07/02/2017, Accepted 29/08/2017, Revised 21/07/2017, Published 05/09/2017

In some applications, the signals received by an array are a mixture of signals emitted by both far-field and near-field sources. This study develops a new cumulant-based multiple signal classification (MUSIC) algorithm for source localisation using a new structural sparse array for scenarios where both far-field and near-field sources coexist. The key feature of this algorithm is that it utilises fourth-order cumulants to compute the virtual covariance matrix and constructs a new special cumulant matrix to acquire the largest number of virtual sensors and the largest array aperture for a given number of sensors. The authors provide a geometric proof to justify the utilisation of the proposed sparse linear array and compute the effective aperture of the array. The proposed algorithm increases resolution ability, direction of arrival (DOA) and range estimation accuracy, and the number of sources to be localised. Moreover, the new method has the main advantage that it does not use the information of all sensors; so that it provides somewhat low computational complexity while it uses many actual and virtual sensors. Monte Carlo simulations are provided to demonstrate the effectiveness of the proposed method.

Inspec keywords: Monte Carlo methods; signal classification; covariance matrices; direction-of-arrival estimation; higher order statistics

Other keywords: Monte Carlo simulations; direction of arrival estimation; virtual covariance matrix; source localisation; range estimation accuracy; structural sparse array; cumulant-based multiple signal classification algorithm; largest aperture sparse linear array; computational complexity

Subjects: Monte Carlo methods; Algebra; Signal processing and detection

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