Precise DOA Estimation Using SAGE Algorithm with a Cylindrical Array

Masaki TAKANASHI  Toshihiko NISHIMURA  Yasutaka OGAWA  Takeo OHGANE  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.11   pp.3784-3787
Publication Date: 2008/11/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.11.3784
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
DOA estimation,  cylindrical array,  coherent signals,  SAGE algorithm,  

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A uniform circular array (UCA) is a well-known array configuration which can accomplish estimation of 360 field of view with identical accuracy. However, a UCA cannot estimate coherent signals because we cannot apply the SSP owing to the structure of UCA. Although a variety of studies on UCA in coherent multipath environments have been done, it is impossible to estimate the DOA of coherent signals with different incident polar angles. Then, we have proposed Root-MUSIC algorithm with a cylindrical array. However, the estimation performance is degraded when incident signals arrive with close polar angles. To solve this problem, in the letter, we propose to use SAGE algorithm with a cylindrical array. Here, we adopt a CLA Root-MUSIC for the initial estimation and decompose two-dimensional search to double one-dimensional search to reduce the calculation load. The results show that the proposal achieves high resolution with low complexity.