基于二维干涉式APES算法的分布式相参阵盲DOA估计  

Blind DOA estimation of distributed coherent arrays based on 2-D interferometric-like APES algorithm

作　　者：朱伟[1] 陈伯孝[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2013年第2期237-243,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61001209;61101244);中央高校基本科研业务费专项资金(K5051202038);长江学者和创新团队发展计划(IRT0954)资助课题

摘　　要：结合干涉雷达的天线结构和二维波达方向(direction of arrival,DOA)估计方法,提出一种基于二维干涉式幅相估计的分布式相参阵盲DOA估计算法。利用二维干涉式幅相估计算法的空间谱和模型阶数选择准则获得目标个数和目标方向余弦的粗估计;使用子阵间的相位中心偏移来获得目标方向余弦的精估计;针对分布孔径带来的测角模糊问题,采用双尺度解模糊算法实现分布式阵列的高精度方向估计。仿真结果验证了分布式相参阵的高精度测角性能及所提算法的有效性,也验证了分布阵DOA估计中存在基线模糊门限。A 2-dimensional（2-D） interferometric-like amplitude and phase estimator （APES） algorithm is proposed for blind direction of arrival （DOA） estimation of distributed coherent arrays, which combines the an- tenna configurations of an interfermetric radar and 2-D DOA estimation algorithms. The number of targets and their coarse direction cosine estimation are obtained from 2-D interferometric-like APES spatial spectral and model-order selection criterion. The high accuracy direction cosine estimation is derived from phase center shift between subarrays. A dual-size algorithm is used to resolve the ambiguity in 2-D DOA estimation resulted from the distributed coherent arrays. Then the low variance and unambiguous 2-D DOA estimation are achieved. Simulation re- sults demonstrate the high accuracy DOA estimation of distributed coherent arrays and the effectiveness of the proposed method, and also demonstrate that a baseline ambiguity threshold exists in the distributed coherent arrays.

关 键 词：分布式相参阵列 二维干涉式幅相估计 解模糊 盲波达方向估计 

分 类 号：TN911.7[电子电信—通信与信息系统]