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Resolving manifold ambiguities in direction-of-arrival estimation for nonuniform linear antenna arrays

Identifieur interne : 005F18 ( PascalFrancis/Checkpoint ); précédent : 005F17; suivant : 005F19

Resolving manifold ambiguities in direction-of-arrival estimation for nonuniform linear antenna arrays

Auteurs : Yu. I. Abramovich [Australie] ; N. K. Spencer [Australie] ; A. Y. Gorokhov [France]

Source :

IEEE transactions on signal processing [ 1053-587X ] ; 1999.

RBID : Pascal:99-0497851

Descripteurs français

Pascal (Inist)
- Traitement signal, Antenne réseau, Barrette linéaire, Ambiguité, Signal gaussien, Rapport signal bruit, Nonidentifiabilité, MUSIC, Direction arrivée, Réseau non uniforme.

English descriptors

KwdEn :
- Ambiguity, Antenna array, Direction of arrival, Gaussian signal, Linear array, Nonuniform array, Signal processing, Signal to noise ratio.

Abstract

This paper addresses the problem of ambiguities in direction-of-arrival (DOA) estimation for nonuniform (sparse) linear arrays. Usually, DOA estimation ambiguities are associated with linear dependence among the points on the antenna array manifold, that is, the steering vectors degenerate so that each may be expressed as a linear combination of the others. Most nonuniform array geometries, including the so-called "minimum-redundancy" arrays, admit such manifold ambiguities. While the standard subspace algorithms such as MUSIC fail to provide unambiguous DOA estimates under these conditions, we demonstrate that this failure does not necessarily imply that consistent and asymptotically effective DOA estimates do not exist. We demonstrate that in most cases involving uncorrelated Gaussian sources, manifold ambiguity does not necessarily imply nonidentifiability; most importantly, we introduce algorithms designed to resolve manifold ambiguity. We also show that for situations where the number of sources exceeds the number of array sensors, a new class of locally nonidentifiable scenario exists.

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Resolving manifold ambiguities in direction-of-arrival estimation for nonuniform linear antenna arrays

Resolving manifold ambiguities in direction-of-arrival estimation for nonuniform linear antenna arrays

Source :

Descripteurs français

English descriptors

Abstract

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Links to Exploration step

Le document en format XML

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