摘要
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。
An improved direction of arrival （DOA） estimation method is proposed with uniform linear array （ULA） when mixed sources are presented. The DOAs of uncorrelated signals are first estimated by using conventional multiple signal classification （MUSIC）. Then the spatial difference matrix is constructed and the contributions of uncorrelated signals are eliminated. Then the coherent signals can be resolved by performing the improved spatial smoothing technique to the spatial difference matrix. The number of sources resolved by the proposed method can exceed the number of array elements. Simulation results indicate that the proposed method is effective, robust and outperforms the existing spatial difference smoothing methods.
出处
《通信技术》
2009年第1期123-125,共3页
Communications Technology
关键词
均匀线阵
相干源
波达方向
空间平滑技术
负反对称矩阵
uniform linear array （ULA）
coherent sources
direction-of-arrival （DOA）
spatial smoothing technique
negative-cross-symmetric matrix
