无需聚焦的宽带相干信号快速DOA估计算法  

Fast DOA Estimation Algorithm for Coherent Wideband Sources Without Focus

作　　者：曾耀平[1] 杨益新[1] 卢光跃[2] 贡维雪 

机构地区：[1]西北工业大学航海学院,西安710072 [2]西安邮电大学通信与信息工程学院,西安710121

出　　处：《微处理机》2015年第2期60-63,69,共5页Microprocessors

基　　金：国家自然科学基金项目(61271276)

摘　　要：提出了一种无需聚焦矩阵的宽带相干信号DOA估计方法。该方法首先通过Toeplitz矩阵重构,在不降低阵列孔径的条件下,实现了宽带信号的解相干;然后利用数据矩阵的厄尔米特特性,通过酉变换将复数矩阵映射为实数矩阵,通过在实数域进行特征分解,大大降低了算法的运算量;最后利用投影子空间正交技术,在不需要聚焦的情况下,可实现宽带相干信号的DOA估计。仿真结果表明所提算法的精度较高、运算量小,可实现相干源方位估计。This paper proposes an approach for the estimation of directions- of- arrival of coherent wideband source signals without the use of focusing matrices. It firstly re- construct the Toeplitz covariance matrix without any loss of array aperture to conduct incoherent wideband sources. Then,according to the characteristic of Hermitian matrix,the unitary is transformed to the real covariance matrix so that the computational burden of eigendecomposition is decreased. Finally,using the orthogonality of projected subspaces,the DOA estimation is obtained without any focus. The computer simulation test shows that the algorithm has higher precision of DOA estimation and lower computational burden,and can deal with coherent signals.

关 键 词：宽带相干信号 DOA估计 投影子空间正交性 Toeplitz化 酉变化 

分 类 号：TN957.52[电子电信—信号与信息处理]