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适于相干信号DOA估计的改进矩阵差分方法

DOI: 10.13190/jbupt.201102.122.guoy, PP. 122-125

Keywords: 波达方向估计,协方差差分,色噪声,相干信号

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Abstract:

提出一种适用于色噪声背景下窄带信号的波达方向估计方法.假设未知色噪声协方差矩阵具有对称的Toeplitz结构,利用线性变换改变阵列协方差矩阵,并与阵列协方差相减,理论上消除了噪声对算法估计性能的影响.新差分算法适用于信号不相干或仅有2个信号相干的波达方向估计.当相干信号多于2个时,通过与空间平滑算法结合,拓展了算法的应用范围.与传统差分算法相比,新算法避免了“伪”波达方向估计,降低了计算复杂度.仿真实验结果表明,新算法具有优越的估计性能.

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