基于窄带信号DOA估计的宽带相干信号DOA估计方法研究  

Study on coherent wideband signals DOA estimation method based on narrowband signals DOA estimation method

作　　者：杨粲[1] 何培宇[1] 李锋[1] 刘志武[1] 

机构地区：[1]四川大学电子信息学院,成都610064

出　　处：《四川大学学报（自然科学版）》2009年第1期112-118,共7页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(60472096)

摘　　要：提出了一种用窄带信号的波达方向(DOA)估计方法与宽带聚焦的方法相结合来估计宽带相干信号的DOA的方法。先利用相干信号子空间法将带宽内各个频率点的信号子空间聚焦到参考频点下的同一信号子空间,然后利用窄带信号的波达方向估计方法对DOA进行估计。用了一种新的无需谱峰搜索并且不要对噪声方差进行估计的窄带SSESPRIT算法进行宽带波达方向的估计,为了比较又用了经典的需要进行谱峰搜索的窄带MUSIC算法进行宽带信号的一维及二维波达方向的估计,仿真实验结果验证了方法的有效性。A method that the narrowband signals direction of arrival （DOA） estimation method and the wideband focusing method are used to estimate the wideband coherent signals DOA is proposed. First, The coherent signal subspace approach is used to focus a signal subspace from its each frequency point in bandwidth to a single referenced frequency point, and then a narrowband signals DOA estimating method is used to estimate direction of arrival. A new algorithm SSESPRIT which dose not need to search spectrum peak or estimate to the noise variance is used to estimate DOA, and MUSIC algorithm, classical but having to search spectrum peak, is used to estimate 1-D and 2-D direction of arrival for comparison. Simulation results verify the effectiveness of the proposed method.

关 键 词：窄带信号 宽带信号 聚焦矩阵 波达方向估计 

分 类 号：TN911.7[电子电信—通信与信息系统]