摘要
非相干信号子空间方法(Incoherent Signal Subspace Method,ISM)无法处理相干宽带信源且运算量较大,在脉冲噪声下,由于二阶相关矩阵无法收敛,基于ISM算法的波达方向(Direction of Arrival,DOA)估计也将失去韧性,为此对ISM算法进行了改进。首先将等间距线阵输出矩阵在频域进行分解,根据各频率分量对应的归一化功率设置门限值,对大于门限的频率分量构建分数低阶相关矩阵(Fractional Low Order Covariance,FLOC),并进行修正以解相干。再对修正后的各低阶矩进行特征值分解并提取噪声特征矩阵,列多项式求根。最后取算术平均,可得相干宽带信源的DOA估计。通过计算机仿真,改进的ISM算法在脉冲噪声下可处理相干宽带信源的DOA估计,且稳健性较好。
Incoherent signal subspace method(ISM)could not deal with coherent wideband sources,and the computational cost was large,under impulsive noise,the direction of arrival(DOA)estimation based on ISM could lose its capability because the two order correlation matrices could not converge.Therefore,the ISM algorithm was improved.Firstly,the output matrix of equal spacing linear array was decomposed in frequency domain,according to the normalized power of each frequency component values corresponding to the set threshold,constructed fractional lower order correlation(FLOC)matrices for the frequency components larger than the threshold,and modified to deal with coherent sources.Then ones decomposed the lower order moments into eigenvalues and extracted the eigenmatrixes of the noise,constructed polynomials and solved roots.Finally,the DOA estimation of coherent wideband sources could be obtained by arithmetic mean.By simulation,the improved ISM algorithm can estimate the wideband coherent sources correctly under the background of impulsive noise,and has good robustness.
作者
杨保海
陈栋
欧阳乾
宋俊慷
樊东红
YANG Baohai;CHEN Dong;OUYANG Qian;SONG Junkang;FAN Donghong(College of Physics and Electronic Engineering,Guangxi Normal University for Nationalities,Chongzuo Guangxi 532200,China;College of Electronic Engineering,Jiujiang University,Jiujiang Jiangxi 332005,China)
出处
《电子器件》
CAS
北大核心
2020年第5期1138-1141,1151,共5页
Chinese Journal of Electron Devices
基金
江西省自然科学基金项目(20192BAB207002)
江西省教育厅科技项目(GJJ170954)
广西高校中青年科研基础能力提升项目(2019KY0784)
广西民族师范学院校级科研项目(2019FG008)
九江学院校级科研项目(2016KJ003)。
关键词
非相干信号子空间方法
脉冲噪声
分数低阶相关矩阵
波达方向
相干宽带信源
求根
incoherent signal subspace method
impulse noise
fractional lower order correlation martix
direction of arrival
coherent wideband sources
root
