| 基于频域模型的宽带信号子空间谱估计方法 |
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| 引用本文： | 冯西安,黄建国. 基于频域模型的宽带信号子空间谱估计方法[J]. 电子学报, 2004, 32(6): 965-967 |
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| 作者姓名： | 冯西安 黄建国 |
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| 作者单位： | 西北工业大学航海学院,陕西,西安,710072 |
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| 摘 要： | 宽带阵列信号是频率的函数,因此其阵列流型及协方差矩阵都随频率变化.本文基于宽带信号的频域模型,通过分析宽带阵列信号协方差矩阵的特征分解结构,证明了宽带阵列信号噪声子空间不随频率变化的特性,并根据这一特性,提出了基于频域模型的宽带子空间谱估计(SSEFD)方法.应用K.Buckley的BASS-ALE方法解决了该方法用于均匀线阵时存在的频率-方位模糊问题.计算机仿真结果验证了SSEFD方法的有效性,与H.Wang的CSS方法的统计性比较表明,新方法具有更高的估计精度.
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| 关 键 词： | 宽带源 频域模型 子空间谱估计 |
| 文章编号： | 0372-2112(2004)06-0965-03 |
Wide-Band Signal-Subspace Spatial-Spectrum Estimation Based on Frequency Domain Modeling |
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| FENG Xi-an,HUANG Jian-guo. Wide-Band Signal-Subspace Spatial-Spectrum Estimation Based on Frequency Domain Modeling[J]. Acta Electronica Sinica, 2004, 32(6): 965-967 |
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| Authors: | FENG Xi-an HUANG Jian-guo |
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| Abstract: | A new approach to estimate the spatial-spectrum of wide-band sources is presented.The approach is termed as wide-band signal-subspace spatial-spectrum estimation based on frequency domain modeling (SSEFD).Firstly,the noise-subspace invariability of wide-band signals is derived by analysis of the eigenstructure of the covariance matrix of the wide-band array signal.And wide-band signal-subspace spatial-spectrum is defined by the invariant noise subspace character.Then Buckley's broad-band signal-subspace spatial-spectrum (BASS-ALE) is proposed for resolving frequency-direction ambiguity when the new approach is applied to a uniform linear array.At last,SSEFD is compared to Wang's coherent signal-subspace (CSS) by computer simulation.The results show good performance of the new approach. |
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| Keywords: | wide-band sources frequency domain modeling signal-subspace spatial-spectrum estimation |
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