| 基于分数阶傅里叶变换的宽带LFM信号波达方向估计新算法 |
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| 引用本文： | 陶然,周云松. 基于分数阶傅里叶变换的宽带LFM信号波达方向估计新算法[J]. 北京理工大学学报, 2005, 25(10): 895-899 |
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| 作者姓名： | 陶然 周云松 |
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| 作者单位： | 北京理工大学,信息科学技术学院电子工程系,北京,100081;北京理工大学,信息科学技术学院电子工程系,北京,100081 |
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| 基金项目： | 国家自然科学基金 , 高等学校优秀青年教师教学科研奖励计划 |
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| 摘 要： | 提出一种新的基于分数阶傅里叶变换和信号子空间分解的宽带线性调频(LFM)信号波达方向(DOA)估计算法.该方法利用LFM信号在分数阶傅里叶变换域的极高的聚集性,在分数阶傅里叶变换域分离信号,并构造分数阶傅里叶变换域的阵列信号相关矩阵.通过对相关矩阵进行特征值分解,估计信号子空间和噪声子空间,并利用MUSIC算法估计宽带LFM信号的波达方向.仿真验证了新方法的有效性.
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| 关 键 词： | 分数阶傅里叶变换 线性调频信号 波达方向估计 MUSIC算法 |
| 文章编号： | 1001-0645(2005)10-0895-05 |
| 收稿时间： | 2004-11-01 |
| 修稿时间： | 2004-11-01 |
A Novel Method for the Direction of Arrival Estimation of Wideband Linear Frequency Modulated Sources Based on Fractional Fourier Transform |
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| TAO Ran and ZHOU Yun-song. A Novel Method for the Direction of Arrival Estimation of Wideband Linear Frequency Modulated Sources Based on Fractional Fourier Transform[J]. Journal of Beijing Institute of Technology(Natural Science Edition), 2005, 25(10): 895-899 |
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| Authors: | TAO Ran and ZHOU Yun-song |
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| Affiliation: | Department of Electronic Engineering, School of Information Science and Technology, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | A new method for the direction of arrival(DOA) estimation of wideband linear frequency modulated(LFM) sources in sensor arrays based on fractional Fourier transform and fractional Fourier domain signal subspace decomposition is presented.The proposed approach first separates LFM sources in fractional Fourier domain using the energy-concentrated property of LFM signal in the fractional Fourier domain,and constructs the fractional Fourier domain correlation matrix of the sensor array sources.Through estimating the signal and noise subspaces with the eigen-decomposition of the correlation matrix,the MUSIC algorithm is used to estimate the DOAs of LFM sources.Computer simulation verified the effectiveness of the new method. |
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| Keywords: | fractional Fourier transform LFM signal DOA estimation MUSIC algorithm |
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