摘要
针对如何提高低信噪比下宽带信号波达方向估计性能的问题,在相干子空间法的基础上,通过重构聚焦矩阵,在不需要预先估计信号方位的同时,有效提高了低信噪比下空间谱的角度分辨率。由于采用空间谱峰值搜索法确定信源的来波方向具有较大误差,根据文中所提出的插值公式,利用空间谱峰值左右谱线的幅度进行修正,可得到较为精确的估计值。仿真结果显示了所述方法的有效性。
A new method is proposed to improve the performance of estimating the direction of arrival for wideband sources in low SNR. Based on coherent signal-subspace Method（CSM）, the angular resolution of spatial spectrum can be significantly improved by reconstructing the focusing matrices, especially in low SNR conditions. To improve the precision of the DOA extracted by the al- gorithm of amplitude search, a new interpolation formula is used to modify the results of DOA. By applying the two lines beside the pea as an error correction mode, more accurate approximation is obtained. The experimental results illustrate the effectiveness of the approach presented.
出处
《电子技术应用》
北大核心
2013年第1期65-68,共4页
Application of Electronic Technique
