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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 728463, 7 pages
http://dx.doi.org/10.1155/2014/728463
Research Article

An Effective Technique for Enhancing Direction Finding Performance of Virtual Arrays

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China

Received 8 July 2014; Revised 22 August 2014; Accepted 22 August 2014; Published 30 December 2014

Academic Editor: Dau-Chyrh Chang

Copyright © 2014 Wenxing Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The array interpolation technology that is used to establish a virtual array from a real antenna array is widely used in direction finding. The traditional interpolation transformation technology causes significant bias in the directional-of-arrival (DOA) estimation due to its transform errors. In this paper, we proposed a modified interpolation method that significantly reduces bias in the DOA estimation of a virtual antenna array and improves the resolution capability. Using the projection concept, this paper projects the transformation matrix into the real array data covariance matrix; the operation not only enhances the signal subspace but also improves the orthogonality between the signal and noise subspace. Numerical results demonstrate the effectiveness of the proposed method. The proposed method can achieve better DOA estimation accuracy of virtual arrays and has a high resolution performance compared to the traditional interpolation method.