摘要
针对相干信源DOA估计提出了一种修正ESPRIT算法,利用时域白噪声信号在不同时刻是不相关的性质,通过对在虚拟平移天线阵列过程中所得阵列的输出数据协方差矩阵进行修正,可减小白噪声的影响。该算法对独立源和相干信源的DOA估计有较高的分辨率,计算量较小,即使在低信噪比、低快拍数和小阵元数的条件下,仍具有很小的估计误差,能较准确地进行相干源的DOA估计。仿真结果验证了修正ESPRIT算法的正确性和有效性。
By modifying the output covariance of the arrays which are formed in the process of virtually moving the antenna, so as to counteract the influence of white noise by making use of the non-correlation property at different time, a modified ESPRIT algorithm for DOA estimation of coherent signals is proposed. This algorithm not only has higher resolution for independent signals but also has very high resolution for coherent signals. The new algorithm has the advantages such as very lower computation cost and accurate estimates. Although in the circumstance of lower signal-to-noise, lower space sampling numbers and smaller sensors, the modified algorithm still has very small estimated error and can estimate DOA of coherent signals much more accurately. The simulation results show that the algorithm is correct and efficient.
出处
《电声技术》
2008年第11期56-60,共5页
Audio Engineering
