Extended Aperture 2-D Direction Finding With a Two-Parallel-Shape-Array Using Propagator Method

被引:24
作者
He, Jin [1 ]
Liu, Zhong [1 ]
机构
[1] Nanjing Univ Sci & Technol, Dept Elect Engn, Nanjing 210094, Jiangsu, Peoples R China
来源
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS | 2009年 / 8卷
基金
中国博士后科学基金;
关键词
Aperture extension; array signal processing; direction finding; propagator method; OF-ARRIVAL ESTIMATION; L-SHAPED ARRAY; ANGLE ESTIMATION; MATRIX; ALGORITHM; ESPRIT;
D O I
10.1109/LAWP.2009.2015224
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 ; 0809 ;
摘要
In this letter, we propose a two-parallel-shape array geometry, consisting of sensors spaced much farther apart than a half-wavelength, to improve estimation accuracy via aperture extension for two-dimensional (2-D) direction finding. First, the subarray parallel with the x-axis is employed to extract automatically paired high-variance but unambiguous y-axis direction cosines and low-variance but cyclically ambiguous x-axis direction cosines. Then, the subarray parallel with the y-axis is employed to extract automatically paired unambiguous x-axis direction cosines and cyclically ambiguous y-axis direction cosines. Finally, the high-variance unambiguous direction cosine estimates are used to resolve the low-variance cyclically ambiguous direction cosine estimates to obtain automatically paired azimuth-elevation angle estimates. The propagator method, which requires only linear operations but involves no eigen-decomposition or singular-value decomposition into signal/noise subspaces, is adapted to derive the direction cosines. Therefore, the proposed technique offers high estimation precision with low computational complexity.
引用
收藏
页码:323 / 327
页数:5
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