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Wide-Band Signal-Subspace Spatial-Spectrum Estimation Based on Frequency Domain Modeling
Author(s): FENG Xian, HUANG Jianguo
Pages: 965-
967
Year: 2004
Issue:
6
Journal: ACTA ELECTRONICA SINICA
Keyword: 宽带源; 频域模型; 子空间谱估计;
Abstract: 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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