適于大陣列天線應(yīng)用的多相關(guān)信號(hào)方向估計(jì)

研究了使用大型天線陣列對(duì)相關(guān)信號(hào)進(jìn)行DOA估計(jì)的修正協(xié)方差矩陣的方法，主要對(duì)接收信號(hào)的協(xié)方差矩陣中的噪聲功率部分進(jìn)行抑制，得出了最終的譜估計(jì)式，并進(jìn)行DOA估計(jì)。其理論分析和仿真結(jié)果表明，該方法對(duì)于相關(guān)信號(hào)以及空間角度比較接近的信號(hào)有較好的分辨能力。
關(guān) 鍵 詞 DOA估計(jì); 修正的協(xié)方差矩陣; 相關(guān)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