基于相位差的均匀圆阵DOA估计新方法  

New method of DOA estimation for UCA based on phase differences

作　　者：王伟[1] 马跃华[1] 李欣[2] 

机构地区：[1]哈尔滨工程大学自动化学院,黑龙江哈尔滨150001 [2]哈尔滨工程大学工程训练中心,黑龙江哈尔滨150001

出　　处：《系统工程与电子技术》2012年第10期1994-1998,共5页Systems Engineering and Electronics

基　　金：国家自然科学基金(60704018);新世纪优秀人才支持计划(NCET_11-0827)资助课题

摘　　要：根据均匀圆阵阵列结构的特点,提出一种利用相邻阵元间相位差进行二维波达方向(direction of ar-rival,DOA)估计的方法。分析了均匀圆阵相邻阵元间接收信号相位差的变化规律,得出了其与入射信号的方位角和俯仰角的对应关系,在此基础上推导出入射信号方位角和俯仰角的闭式解。同时,针对相位差测量中存在相位模糊的问题,提出一种循环搜索算法有效地实现了相位差的解模糊,极大地提高了利用相位差进行DOA估计的稳健性和适用范围。理论分析和仿真结果表明,该二维DOA估计方法可以在存在相位模糊的情况下稳健有效地工作。According to the characteristics of uniform circular array （UCA）, a method using phase differ- ences to estimate two dimensional direction of arrival （2-D DOA） is proposed. By analyzing the varying regulari- ty of phase differences between adjacent array elements, the corresponding relationship between the phase differences and the azimuth, elevation angle of incident signals is educed. On this basis the closed-form solutions of azimuth and elevation is gotten. When phase ambiguity appears in phase difference measuring, a new algo- rithm of solving phase difference ambiguity is proposed to improve the robustness of the proposed 2-D DOA esti- mation algorithm. Simulation results indicate that the proposed method is able to achieve 2 D DOA estimation effectively even when the phase ambiguity exists.

关 键 词：均匀圆阵 二维波达方向估计 相位差 解模糊 

分 类 号：TN911.7[电子电信—通信与信息系统]