Low-complexity estimation of 2D DOA for coherently distributed sources

被引:102
作者
Lee, J
Song, I [1 ]
Kwon, H
Lee, SR
机构
[1] Queens Univ, Dept Elect & Comp Engn, Kingston, ON K7L 3N6, Canada
[2] Mokpo Natl Univ, Dept Elect Engn, Jeonnam 534729, South Korea
[3] Korea Adv Inst Sci & Technol, Dept Elect Engn, Yuseong Gu, Taejon 305701, South Korea
关键词
distributed sources; uniform circular array (UCA); sequential one-dimensional searching (SOS);
D O I
10.1016/S0165-1684(03)00103-8
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 [电气工程]; 0809 [电子科学与技术];
摘要
We consider the estimation of two-dimensional (azimuth and elevation) direction-of-arrival (DOA) using a pair of uniform circular arrays under a coherently distributed source model. Since the coherently distributed source is characterized by four parameters, the nominal azimuth DOA, angular extension of the azimuth DOA, nominal elevation DOA, and angular extension of the elevation DOA, the computational complexity of the parameter estimation is normally highly demanding. We propose a low-complexity estimation algorithm, called the sequential one-dimensional searching algorithm by concentrating only on the estimation of DOAs. The SOS algorithm has a basis on the eigenstructure between the steering matrix and signal subspace, and utilizes preliminary estimates obtained at a pre-processing stage. The SOS algorithm estimates the DOAs, but not the angular extensions: although the SOS algorithm does not provide estimates of angular extensions, it is useful when the angular extensions are small. Specifically, it is shown from simulation results that the SOS algorithm exhibits as good an estimation performance as the maximum likelihoood method for coherently distributed sources. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:1789 / 1802
页数:14
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