一种新的宽带DOA估计方法  

A New Method for Wideband DOA Estimation

作　　者：于红旗[1] 徐欣[1] 黄知涛[1] 周一宇[1] 

机构地区：[1]国防科学技术大学四院,长沙410073

出　　处：《信号处理》2009年第1期118-121,共4页Journal of Signal Processing

基　　金：国家自然科学基金资助项目(批准号:60502040)

摘　　要：提出了一种新的宽带DOA估计方法:频域子空间正交性测试方法(TOFS:Test of orthogonality of frequency sub- space)。该方法通过同时测试频域信号共同带宽内各频段噪声子空间与阵列流形之间的正交性来进行DOA估计。与宽带相干信号子空间方法不同,TOFS方法不需要任何初始值的预估及聚焦操作。与宽带非相干信号子空间方法也不同,TOFS方法同时测试各频段噪声子空间与阵列流形之间的正交性。本文仿真了TOFS与IMUSIC、CSSM、TOPS的性能比较。仿真结果表明TOFS方法在中等信噪比以上时有较好的性能,且避免了TOPS方法中常出现的伪峰。In this paper, a new DOA estimation algorithm for wideband sources called TOFS is introduced. This new technique estimates DOAs by measuring the orthogonal relation between the searching steering vectors and the noise subspaces of multiple frequency components of the sources. Unlike other coherent signal subspace methods, TOFS does not require any preprocessing for initial values. Unlike the incoherent signal subspace methods ,TOFS estimates DOAs by measuring the orthogonal relation of every frequency bin simultaneously. The performance of the IMUSIC, CSSM and TOPS are compared with the new method through computer simulations. The simulations show that this new technique performs better than others when SNR is mid to high. At the same time, TOFS can avoid fake peaks that often appear in TOPS technique.

关 键 词：阵列信号处理 到达角估计 投影子空间正交性测试方法 宽带信号 

分 类 号：TN911[电子电信—通信与信息系统]