均匀圆阵来波方向估计的解模糊算法  

Ambiguity Resolution Technology for Direction of Arrival Estimation in UCAs

作　　者：冷文[1] 王安国[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《天津大学学报》2011年第2期152-156,共5页Journal of Tianjin University(Science and Technology)

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB310605)

摘　　要：均匀圆阵在半径大于半波长的情况下,由于来波方向(DOA)估计模糊会导致测向性能下降,为解决这一问题,提出了一种新算法.通过调整阵列中某阵元为小半径阵元,可以打破来波方向估计中虚假角度和真实角度形成的导向矢量近似或者相同的平衡,实现对来波方向估计中模糊伪峰的抑制.通过应用虚拟阵列变换方法,解决了该算法需要改动原有天线阵列结构的实际问题.仿真结果表明该算法可以有效抑制伪峰,实现在大半径条件下均匀园阵对于来波方向的准确估计.When the radius of the uniform circle array （UCA） is larger than half wavelength, the accuracy of direction finding （DF）will be reduced due to ambiguity. To solve the problem, a novel method is proposed, in which some element in UCA is modified as the small-radius element, for the purpose of breaking the balance achieved when the steering-vectors generated by the false and true angle in direction of arrival （DOA）estimation are completely equal. The method can restrain the false peak. With virtual array transformation applied, the method can be implemented without changing the actual UCA＇s structure. The simulation result proves that the proposed method can effectively restrain the false peak and realize the accurate DOA estimation in the planar array with larger radius.

关 键 词：来波方向估计 均匀圆阵 导向矢量 模糊 虚拟阵列变换 

分 类 号：TN911.23[电子电信—通信与信息系统]