有效扩展阵列孔径的伪快拍构造  

Construction of pseudo-snapshot with augmented array aperture

作　　者：刘学斌[1] 韦岗[1] 单志龙[1] 

机构地区：[1]华南理工大学电子与信息学院,广东广州510640

出　　处：《电波科学学报》2006年第2期269-274,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金(60101002);国家教委博士点基金(20010561007)

摘　　要：许多通信信号具有循环平稳特性。针对广义信号模型和窄带信号模型,利用前后向循环相关函数分别构造出一种新的伪快拍,由此获得了一个孔径扩展一倍的虚拟阵列。对这两种伪快拍应用传统的MUSIC算法时,可分别比SCSSF和cyclicMUSIC算法检测多一倍的信号和获得更高的估计分辨率。仿真结果证明了该结论。Many modulated communication signals exhibit a cyclostationarity property. In this paper, a new kind of pseudo-snapshot for either general signal model or narrow-band signal model is proposed based on forward-backward cyclic correlation function, and a virtual array with doubly augmented aperture of true array is obtained by two kinds of pseudo-snapshot, while conventional algorithms such as MUSIC, cyclic-MUSIC and SC-SSF all keep array aperture unchanged. Applying the new pseudo-snapshot into MUSIC method, two times number of DOA can be detected and higher resolution can be achieved in comparison with SC-SSF in the case of general signal model or cyclic-MUSIC in the case of narrow-band signal model. The simulation results prove the validity of the metod presented.

关 键 词：阵列信号处理 波达方向估计 循环平稳 伪快拍 

分 类 号：TN911.7[电子电信—通信与信息系统]