基于共轭循环平稳特性的二维波达方向估计方法  

Two-dimensional Direction-of-arrival Estimation Based on Conjugate Cyclostationarity

作　　者：张聪[1] 肖山竹[1] 陶华敏[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《航空学报》2008年第5期1297-1301,共5页Acta Aeronautica et Astronautica Sinica

基　　金：国家"863"计划(2007AA703428);国家重点实验室基金(JC05-04-12)

摘　　要：提出了一种具有阵列孔径扩展能力的共轭循环平稳二维波达方向(DOA)估计方法。该方法通过引入伪采样,充分利用了阵元输出之间共轭循环互相关函数的时间维信息,扩展了阵列有效孔径,提高了算法DOA估计精度,具有较好的低信噪比适应能力。该方法避免了最优时延选择问题,无需谱峰搜索,且其二维角度参数能够自动配对,具有较低的计算量。计算机仿真结果验证了该方法的有效性。Many artificially modulated signals exhibit a cyclostationarity （or periodic correlation） property which corresponds to the underlying periodicity arising from carrier frequencies or baud rates. In this article a new two-dimensional direction-of-arrival （DOA） estimation method is proposed which exploits the conjugate cyclostationarity of the signal to improve the DOA estimation performance. By properly combining the spatial information with the temporal conjugate cyclostationarity of the signal, the optimal lag selection problem can be avoided, and the array aperture can be considerably extended. Consequently, an improvement of the DOA estimation resolution is achieved, even with low signal-to-noise ratio. Furthermore, the two-dimensional searching and parameter pairing processes are avoided. Computer simulations are conducted to show the efficiency of the proposed method.

关 键 词：阵列信号处理 二维波达方向 循环平稳 共轭循环相关 双平行均匀线阵 

分 类 号：TN911.7[电子电信—通信与信息系统]