非规则几何结构阵列下的宽带线性调频信号波达方向估计  

DOA Estimation of Wideband LFM Signals for Irregular Geometry Array

作　　者：罗蓬[1] 刘开华[1] 黄翔东[1] 于洁潇[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10期878-883,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(60872001)

摘　　要：针对现有的宽带线性调频(LFM)信号波达方向(DOA)估计方法仅适用于各种规则几何结构阵列的问题,提出了一种基于分数阶Fourier变换(FRFT)、并适用于非规则几何结构阵列的DOA估计新方法.该方法利用FRFT对LFM信号的聚焦性,建立了分数阶Fourier域阵列数据模型.结合ESPRIT算法的思想,在分数阶Fourier域上定义了非规则子阵列间的广义旋转矩阵.利用该矩阵构造空间谱函数,并通过谱峰搜索的办法实现了DOA估计.理论分析证明了该方法是传统的FRFT-ESPRIT算法的广义形式.仿真实验的结果证明了该方法的有效性.The current direction of arrival （DOA） estimation algorithm of wideband linear frequency modulation （LFM） signals can be applied only to regular geometry array. To solve this problem, a new algorithm was proposed which can be applied to irregular geometry array. Based on the excellent energy-concentrated performance of LFM signal in the fractional Fourier domain, a new array data vector was constructed, then the idea of ESPRIT algorithm was used to define the generalized rotation matrix between irregular subarrays, and finally the source DOAs were estimated by the spectral peak searching process using the spatial spectral function. It has been verified that the estimator in this paper is a generalized form of conventional FRFT-ESPRIT algorithm. Simulation results have verified the efficiency of the algorithm.

关 键 词：宽带线性调频信号 信号波达方向估计 非规则阵列 ESPRIT算法 

分 类 号：TN911.72[电子电信—通信与信息系统]