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基于两次傅里叶变换的时域MUSIC波达方向估计
邱岚
0
(江西科技学院 信息工程学院,南昌 330098)
摘要:
针对基于频域多重信号分类(MUSIC)的波达方向(DOA)估计方法在有效快拍数较少情况下的不稳定问题,提出了一种基于两次傅里叶变换的时域MUSIC波达方向估计方法。首先,通过傅里叶变换将各阵元接收数据转换为频域数据,并按扫描角度对各阵元数据进行相位补偿;然后,再通过傅里叶变换将补偿后的频域共轭数据转换为时域复解析数据,在时域构建相移后的协方差矩阵;最后利用特征分解求取具有正交特性的噪声子空间,获得扫描方位空间谱,实现对波达方向估计。数值仿真及实测数据处理结果均表明,相比频域MUSIC方法,在一次有效快拍条件下,所提方法可稳定获得具有正交特性的噪声子空间,实现对波达方向估计;稳定性得到了5 dB的改善,背景噪声级和旁瓣级得到了3 dB以上的改善,因此该方法可明显提高目标检测和方位估计性能。
关键词:  波达方向估计  MUSIC方法  傅里叶变换  时域复解析
DOI:
基金项目:江西省教育厅科学技术研究项目(GJJ151149)
Time-domain MUSIC for DOA estimation based on twice Fourier transform
QIU Lan
(Department of Information Engineering,Jiangxi University of Technology,Nanchang 330098,China)
Abstract:
To solve the instability of Direction of Arrival(DOA) estimation of frequency-domain Multiple Signal Classification(MUSIC) in the case of few snapshots,a time-domain MUSIC method for DOA estimation based on twice Fourier Transform is proposed.Firstly,the frequency-domain form of received data of each element is obtained by the Fourier Transform whose phase is compensated in the search angle.Then,the time-domain complex analysis data is translated from the frequency-domain conjugate data after phase compensation by the Fourier Transform,and the covariance matrix is constructed in time-domain.Finally,the orthogonal noise subspace is solved by eigen-decomposition,the spatial spectrum of search angle is obtained,and the DOA is estimated.The processed results of numerical simulation and measured data show that,compared with the frequency-domain MUSIC method,under the case of one effective snapshot,the proposed method can statistically solve the orthogonal noise subspace and realize DOA estimation.The stability is improved 5 dB,and the background noise level and side-lobe level of spatial spectrum is improved more than 3 dB.So the proposed method has better performance of target detection and DOA estimation.
Key words:  DOA estimation  MUSIC method  Fourier transform  time domain analysis
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