A Low Complexity Algorithm for Azimuth/Elevation Angle Estimation by Using Alternate Subspace Projections

Yung-Yi WANG  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.1   pp.114-121
Publication Date: 2007/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.1.114
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
2-D DOA estimation,  MUSIC,  rectangular antenna array,  

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A one dimensional (1-D) based tree structure algorithm is proposed for estimating the 2D-DOAs of the signals impinging on a uniform rectangular array. The key idea of the proposed algorithm is to successively utilize the 1-D MUSIC algorithm several times, in tree structure, to estimate the azimuth and the elevation angles independently. Subspace projectors are exploited in conjunction with the 1-D MUSIC algorithms to decompose the received signal into several signals each coordinated by its own 2D-DOA. The pairing of the azimuth estimates and the associated elevation estimates is naturally determined due to the tree structure of the algorithm.