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文中提出了一种基于均匀线阵的混合源波达方向DOA估计的改进方法。该方法首先利用传统MUSIC方法估计出非相干信号源的DOA,然后接收数据协方差矩阵进行差分消除不相关源和噪声的影响,对其进行特殊的空间平滑去相干,从而利用重建的数据协方差矩阵估计相干源的DOA。此方法的特点是分别估计不相关信号和相干信号的DOA。优点是算法在估计出多于阵元数信号的前提下具有较高的DOA估计精度和稳健性。仿真结果表明此方法的估计性能优于空间差分平滑算法。
In this paper, an improved method of DOA estimation of DOA based on uniform linear array is proposed. In this method, the DOA of the incoherent signal source is first estimated by using the traditional MUSIC method, and then the data covariance matrix is received to perform differential cancellation of the uncorrelated sources and noise. The method performs special spatial smoothing and decorrelation so that the reconstructed data covariance Matrix Estimation DOA of Coherent Sources. The characteristic of this method is the estimation of the DOA of the uncorrelated and coherent signals, respectively. The advantage is that the algorithm has higher DOA estimation accuracy and robustness under the premise of estimating more signals than array elements. The simulation results show that this method is better than the spatial difference smoothing algorithm in estimation performance.