中文摘要：

在日益复杂的信号环境中,阵列信号处理需要面对循环和非循环混合信号源的情况越来越多。针对循环和非循环混合信号源的情况,分析了混合信号源条件下的子空间特征,提出了一种混合信号源条件下的快速波达方向估计与识别方法,有效地利用了混合信号源中的非循环特性。理论分析和仿真实验结果表明,波达方向估计结果的分辨率不仅较于常规方法有所提高,而且可处理的信源数目大于阵元数目,具有较强的过载处理能力。

英文摘要：

In array signal processing,the cases of mixed circular and non-circular sources are more and more frequently encountered in complex signal situation.By analyzing the subspace property of the mixed circular and non-circular signal sources in detail,an enhanced and fast method for direction of arrival（DOA） estimation and identification of mixed circular and non-circular sources is proposed.Since the proposed method efficiently utilizes the useful non-circularity properties of the mixed circular and non-circular source model,it has better performance of DOA estimation compared with the method only based on homogeneous source model and its performance is closed to the theoretical bound.Simulation results show that by using the proposed method in DOA estimation,the number of mixed signal sources can be larger than the number of array elements.