适于相干信号DOA估计的改进矩阵差分方法

doi:10.13190/jbupt.201102.122.guoy

北京邮电大学学报 ›› 2011, Vol. 34 ›› Issue (2): 122-125.doi: 10.13190/jbupt.201102.122.guoy

适于相干信号DOA估计的改进矩阵差分方法

郭艳¹，刘学亮²，李宁¹,吴启辉¹

1解放军理工大学通信工程学院, 南京 210007; 293601部队气象中心, 山西大同 037006

收稿日期:2010-07-19 修回日期:2010-12-06 出版日期:2011-04-30 发布日期:2011-04-28
通讯作者: 郭艳 E-mail:jsyanguo@yahoo.com.cn
基金资助:
国家自然科学基金项目（60932002，61072044）；国家重点基础研究发展计划项目（2009CB3020400）；国家高技术研究发展计划项目（2009AA01Z243）；江苏省自然科学基金项目（BK2009056）

Modified Covariance Differencing Method to DOA Estimation of Coherent Signals

Received:2010-07-19 Revised:2010-12-06 Online:2011-04-30 Published:2011-04-28
Supported by:
;National 973 Program

摘要/Abstract

摘要：

提出一种适用于色噪声背景下窄带信号的波达方向估计方法. 假设未知色噪声协方差矩阵具有对称的Toeplitz结构，利用线性变换改变阵列协方差矩阵，并与阵列协方差相减，理论上消除了噪声对算法估计性能的影响. 新差分算法适用于信号不相干或仅有2个信号相干的波达方向估计. 当相干信号多于2个时，通过与空间平滑算法结合，拓展了算法的应用范围. 与传统差分算法相比，新算法避免了“伪”波达方向估计，降低了计算复杂度. 仿真实验结果表明，新算法具有优越的估计性能.

关键词: 波达方向估计, 协方差差分, 色噪声, 相干信号

Abstract:

A modified covariance differencing method is proposed to the direction of arrival (DOA) estimation of narrowband signals under a colored noise environment. The covariance matrix of received data is transformed in a linear way. The noise component is eliminated finally by assuming a symmetric Toeplitz matrix for the unknown array noise. The covariance differencing algorithm works well when impinging signals are uncorrelated or just two signals are coherent. The proposed approach combined with spatial smoothing technique is further investigated in the case that coherent signals are more than two. Analysis shows that new approach can avoid generating “phantom” angles while providing accurate DOA estimation. Therefore the proposed method operates at a lower computational complexity compared with conventional methods. Simulation results demonstrate the effectiveness of presented algorithm.

Key words: direction of arrival estimation, covariance differencing, colored noise, coherent signals

中图分类号:

TN911.23

郭艳，刘学亮，李宁,吴启辉. 适于相干信号DOA估计的改进矩阵差分方法[J]. 北京邮电大学学报, 2011, 34(2): 122-125.

参考文献

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适于相干信号DOA估计的改进矩阵差分方法

Modified Covariance Differencing Method to DOA Estimation of Coherent Signals

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