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文中提出一种空间非均匀噪声环境下的信号源DOA估计的改进方法。该算法首先对阵列协方差矩阵进行平滑处理,在此基础上估计出空间非均匀噪声协方差矩阵,通过已估计的噪声协方差矩阵对平滑处理后的阵列数据协方差矩阵进行白化处理,克服了空间非均匀噪声对空间谱估计的影响,实现信号源DOA估计。相对于原方法,文中所提方法改善了DOA估计的性能,计算量小,并且能够估计强相关或相干信号源DOA。理论分析和仿真结果均表明所提方法的有效性。
In this paper, we propose an improved DOA estimation method for signal source under non-uniform noise environment. The algorithm first smoothes the array covariance matrix, then estimates the spatial heterogeneous noise covariance matrix, and whitens the smoothed array data covariance matrix by using the estimated noise covariance matrix The effect of spatial non-uniform noise on spatial spectrum estimation and DOA estimation of signal source. Compared with the original method, the proposed method improves the performance of DOA estimation with less computational complexity and can estimate DOA of strong correlation or coherent signal source. Theoretical analysis and simulation results show the effectiveness of the proposed method.