| 适于相干信号DOA估计的改进矩阵差分方法 |
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| 引用本文： | 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 |
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| 作者姓名： | 郭艳 刘学亮 李宁 吴启辉 |
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| 作者单位： | 解放军理工大学通信工程学院,南京,210007;93601部队气象中心,山西大同,037006 |
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| 基金项目： | 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) |
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| 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.
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| 关 键 词： | 波达方向估计 协方差差分 色噪声 相干信号 |
| 收稿时间： | 2010-07-19 |
Modified Covariance Matrix Differencing Method for DOA Estimation of Coherent Signals |
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| GUO Yan,LIU Xue-liang,LI Ning,WU Qi-hui. Modified Covariance Matrix Differencing Method for DOA Estimation of Coherent Signals[J]. Journal of Beijing University of Posts and Telecommunications, 2011, 34(2): 122-125 |
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| Authors: | GUO Yan LIU Xue-liang LI Ning WU Qi-hui |
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| Affiliation: | GUO Yan1,LIU Xue-liang2,LI Ning1,WU Qi-hui1(1.Institute of Communications Engineering,People's Liberation Army University of Science and Technology,Nanjing 210007,China,2.Meteorological Center,No.93601 Army of People's Liberation Army,Shanxi Datong 037006,China) |
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| 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 te... |
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| Keywords: | direction of arrival estimation covariance differencing colored noise coherent signals |
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