Open Access

Near-Field Source Localization by Using Focusing Technique

EURASIP Journal on Advances in Signal Processing20082008:461517

https://doi.org/10.1155/2008/461517

Received: 2 June 2008

Accepted: 7 November 2008

Published: 19 November 2008

Abstract

We discuss two fast algorithms to localize multiple sources in near field. The symmetry-based method proposed by Zhi and Chia (2007) is first improved by implementing a search-free procedure for the reduction of computation cost. We present then a focusing-based method which does not require symmetric array configuration. By using focusing technique, the near-field signal model is transformed into a model possessing the same structure as in the far-field situation, which allows the bearing estimation with the well-studied far-field methods. With the estimated bearing, the range estimation of each source is consequently obtained by using 1D MUSIC method without parameter pairing. The performance of the improved symmetry-based method and the proposed focusing-based method is compared by Monte Carlo simulations and with Crammer-Rao bound as well. Unlike other near-field algorithms, these two approaches require neither high-computation cost nor high-order statistics.

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Authors’ Affiliations

(1)
Ecole Polytechnique de l'Université de Nantes, Institut de Recherche en Electrotechnique et Electronique de Nantes Atlantique (IREENA)

Copyright

© Hongyang He et al. 2008

This article is published under license to BioMed Central Ltd. 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.