研究了使用大型天線陣列對相關信號進行DOA估計的修正協方差矩陣的方法，主要對接收信號的協方差矩陣中的噪聲功率部分進行抑制，得出了最終的譜估計式，并進行DOA估計。其理論分析和仿真結果表明，該方法對于相關信號以及空間角度比較接近的信號有較好的分辨能力。
關 鍵 詞 DOA估計; 修正的協方差矩陣; 相關多徑; 空間平滑

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