Circular array and estimation of direction of arrival of a broadband source

Padmini, Usha C and Naidu, Prabhakar S (1994) Circular array and estimation of direction of arrival of a broadband source. In: Signal Processing, 37 (2). pp. 243-254.

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Abstract

A circular array for estimation of direction of arrival (DOA) of a broadband source is shown to possess several nice properties as compared to those of a linear array. In addition to already known properties of a circular array, namely, lack of left-right ambiguity and resolution independent of bearing, we have shown that (i) in DOA estimation of a broadband source with circular array it is possible to avoid the frequency-direction ambiguity even without the use of delay elements except when two sources happen to be 180° apart; (ii) inter sensor spacing need not be $\leq \lambda_{min}/2$. On account of the last property it is possible to create a large aperture circular array without increasing the number of sensors, instead using a large number of tap delay elements. This would however result in increased processing complexity. Such a large aperture circular array is found to possess superior resolution capability and robustness.

Item Type:	Journal Article
Publication:	Signal Processing
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	Circular array;DOA estimation;Subspace;Broadband signal;Large aperture;Frequency-direction ambiguity
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	19 Oct 2006
Last Modified:	19 Sep 2010 04:31
URI:	http://eprints.iisc.ac.in/id/eprint/8308

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