适于大阵列天线应用的多相关信号方向估计

研究了使用大型天线阵列对相关信号进行DOA估计的修正协方差矩阵的方法，主要对接收信号的协方差矩阵中的噪声功率部分进行抑制，得出了最终的谱估计式，并进行DOA估计。其理论分析和仿真结果表明，该方法对于相关信号以及空间角度比较接近的信号有较好的分辨能力。
关 键 词 DOA估计; 修正的协方差矩阵; 相关多径; 空间平滑

Abstract The consideration of Enhanced Covariance Matrix Technique(ECMT) in DOA estimation for coherent signal sources using large-scale array is discussed and introduced in the paper. This technique is to reduce the noise power contribution to the covariance matrix so as to enhance the signal to noise ratio at reception. It’s found in our simulation and analysis that the technique can achieve high resolution in resolving coherent signal sources and closely spaced signals. The simulation results are given to validate the consideration.
Key words DOA estimation; enhanced covariance matrix; coherent multipath; spatial smoothing