一种虚拟阵列扩展解相干的DOA算法  

Decorrelate DOA Algorithm Based on Virtual Array Extension

作　　者：段红亮[1] 黄登山[1] 陈海华[2] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710072 [2]中国科学院计算技术研究所,北京100190

出　　处：《计算机仿真》2013年第1期280-283,共4页Computer Simulation

摘　　要：在移动通信阵列信号处理中,由于多径传播等因素的影响,存在大量相干信号源,现有解相干DOA算法大多会损失阵列的有效孔径,而阵列孔径大小直接限制了空间分辨率及所能估计的信号源个数。针对上述情况,提出一种虚拟阵列扩展的改进双向空间平滑算法(Virtual-array SS,VSS),利用入射信号的非圆对称性,阵列扩展后得到新的虚拟阵列,并做相应的预处理后再利用双向空间平滑算法对该虚拟阵列进行处理。大量仿真结果表明,VSS算法是一种具有高分辨率、高统计稳定性、计算量相对增加较小的解相干DOA算法。In practicalarray signal processing, due to the affection of multipath propagation and other factors, there are a large number of coherent signals. However, the mostly existing decorrelate DOA algorithms will sacrifice the effective array aperture. In such cases, this paper presented a modified Spatial Smoothing （SS） algorithm based on virtual array extension, called Virtual-array SS （VSS）. It utilized the non-circular symmetry of the incident sig- nal to extend the original array effectively, and supplied a virtual signal array. Finally, we introduced a MUSIC-like algorithm such as Forward-backward SS （FBSS） to process this virtual array and analyse its direction finding per- formance. Simulation results confirm the theoretical analysis and indicate the effectiveness of the VSS algorithm, especially on decorrelafion.

关 键 词：波达方向 解相干 非圆对称性 虚拟阵列扩展 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]