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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Toep litz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.
A method for estimating the DOA of narrow-band signals applied to colored noise is proposed.It is assumed that the unknown color noise covariance matrix has a symmetric Toep-litz structure, the array covariance matrix is changed by linear transformation and subtracted from the array covariance, and the theory Which eliminates the effect of noise on the performance of the proposed algorithm.The new algorithm is suitable for DOA estimation of signal-independent or only 2-signal coherence.When there are more than 2 coherent signals, Compared with the traditional algorithm, the new algorithm avoids the “pseudo” arrival direction estimation and reduces the computational complexity.The simulation results show that the new algorithm has superior performance.