扩展孔径的电磁矢量多入多出雷达目标定位算法  

Target localization for aperture extending MIMO radar with electromagnetic vector antenna

作　　者：樊劲宇[1] 苏卫民[1] 顾红[1] 王钊[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094

出　　处：《电波科学学报》2014年第4期610-615,共6页Chinese Journal of Radio Science

基　　金：教育部博士点基金(20113219110018);南京理工大学研究基金(2010ZDJH05;2011ZDJH13)

摘　　要：提出了一种基于双基地电磁矢量多输入多输出雷达的二维收发角估计算法.针对扩展孔径条件下传统算法的周期性角度模糊问题,提出了一种从极化信息矩阵中求取收发信号波印廷矢量来实现解模糊的算法.极化信息矩阵可通过张量分解从回波数据中求取.为提高发射角估计精度,给出了一种更严格的正交约束条件:不仅要求不同阵元间发射的信号相互正交,还要求同一阵元内所有的偶极子天线发射的信号也相互正交.进而可从极化信息矩阵中得到发射角的不模糊估计.与传统算法相比,该算法通过增大阵元间距提高角度估计性能,且不会产生角度模糊,避免了谱峰搜索和额外的配对过程.仿真实验验证了算法有效性.The estimation of the 2D-direction of departure（2D-DOD）and 2D-direction of arrival（2D-DOA） for MIMO radar system is investigated. A novel algorithm is proposed to unwrap the cyclically ambiguous of the angles estimated by conventional algorithm when aperture extended. The key step is to estimate the poynting vector of signal from the polarization information matrix, which is obtained by CANDECOMP/PARAFAC de- composition. In order to improve the accuracy of DOD,a stricter orthogonal constraint is proposed that the signals of spatial separated elements should be suit to the orthogonal constraint. Furthermore,every antenna in a same geometry center transmits narrow or- thogonal signals simultaneously. Thus,the unambiguous estimation of DOD could be ob- tained from the polarization information matrix. The proposed algorithm offers a better performance through aperture extension without angle ambiguous. It requires neither peak searching nor pairing processes, and simulation results are presented to verify the effectiveness of the proposed algorithm.

关 键 词：双基地MIMO雷达 2D-DOD 2D—DOA 电磁矢量天线 极化散射矩阵 

分 类 号：TN958[电子电信—信号与信息处理]