DocumentCode :
1498856
Title :
Computationally Efficient Subspace-Based Method for Two-Dimensional Direction Estimation With L-Shaped Array
Author :
Wang, Guangmin ; Xin, Jingmin ; Zheng, Nanning ; Sano, Akira
Author_Institution :
Inst. of Artificial Intell. & Robot., Xi´´an Jiaotong Univ., Xi´´an, China
Volume :
59
Issue :
7
fYear :
2011
fDate :
7/1/2011 12:00:00 AM
Firstpage :
3197
Lastpage :
3212
Abstract :
In order to mitigate the effect of additive noises and reduce the computational burden, we propose a new computationally efficient cross-correlation based two-dimensional (2-D) direction-of-arrivals (DOAs) estimation (CODE) method for noncoherent narrowband signals impinging on the L-shaped sensor array structured by two uniform linear arrays (ULAs). By estimating the azimuth and elevation angles independently with a one-dimensional (1-D) subspace-based estimation technique without eigendecomposition, where the null spaces are obtained through a linear operation of the matrices formed from the cross-correlation matrix between the received data of two ULAs, then the pair-matching of estimated azimuth and elevation angles is accomplished by searching the minimums of a cost function of the azimuth and elevation angles, where the computationally intensive and time-consuming eigendecomposition process is avoided. Further the asymptotic mean-square-error (MSE) expressions of the azimuth and elevation estimates are derived. The effectiveness of proposed method and the theoretical analysis are verified through numerical examples, and it is shown that the proposed CODE method performs well at low signal-to-noise ratio (SNR) and with a small number of snapshots.
Keywords :
array signal processing; direction-of-arrival estimation; matrix algebra; mean square error methods; 2D DOA estimation CODE method; L-shaped sensor array; asymptotic mean-square-error expressions; azimuth estimation; cross-correlation based two-dimensional direction-of-arrivals estimation method; cross-correlation matrix; eigendecomposition; elevation angle estimation; low signal-to-noise ratio; noncoherent narrowband signals impinging; one-dimensional 1D subspace-based estimation technique; two-dimensional direction estimation; uniform linear arrays; Additive noise; Arrays; Azimuth; Covariance matrix; Direction of arrival estimation; Estimation; Signal to noise ratio; Direction-of-arrival (DOA) estimation; eigendecomposition; pair-matching; uniform linear array (ULA);
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/TSP.2011.2144591
Filename :
5752876
Link To Document :
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