DOA estimation based on fourth-order cumulants with unknown mutual coupling
DOA estimation based on fourth-order cumulants with unknown mutual coupling
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DOI：
10.1016/j.sigpro.2009.03.035
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发表时间：
2009-09
期刊：
影响因子：
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通讯作者：
Chao Liu;Z. Ye;Yufeng Zhang
中科院分区：
文献类型：
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作者：
Chao Liu;Z. Ye;Yufeng Zhang
现有的互耦合DOA估计算法大多基于二阶统计量，假设噪声为加性高斯白噪声。本文提出了一种基于四阶累积量（FOC）的均匀线性阵列（ULA）在未知互耦情况下的DOA估计方法。该方法适用于非高斯信号与未知有色高斯噪声共存的情况。利用该方法的固有机制可以对未知的相互耦合进行盲目补偿，并且可以在不需要任何校准源的情况下准确估计信号的DOA。由于采用了FOC，高斯噪声得到了很大的抑制，在低信噪比条件下也能获得良好的估计性能。仿真结果验证了该方法的有效性。
Most of the existing direction of arrival (DOA) estimation algorithms with mutual coupling are generally based on the second-order statistics while assuming that the noise is additive white Gaussian noise. In this paper, a method based on fourth-order cumulants (FOC) is proposed for DOA estimation with uniform linear array (ULA) in the presence of unknown mutual coupling. The method can be applied when non-Gaussian signals coexist with unknown colored Gaussian noise. The unknown mutual coupling can be blindly compensated by the inherent mechanism of the proposed method and the DOA of signals can be accurately estimated without any calibration sources. Since we use the FOC, the Gaussian noise is greatly suppressed and we can obtain a good estimation performance in low SNR condition. Simulation results demonstrate the effectiveness of our method.