《表1 HANKEL矩阵的NSVs Tab.1 Normalized singular values (NSVs) of hankel matrix》

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《基于Hankel矩阵SVD的均匀线阵信源数估计》

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In summary，because of the larger threshold scope and more stable distribution property of the symmetical‘arch’form，it is worthwhile to utilize the proposed Hankel matrix to perform the SVD-based enumeration，especially in the low SNR region.In addtion，it is noted that the addition of the term of noise variance into Hankel matrix and the corresponding number have the changeable and unforeseeable effect on distribution property of the PCEs and lead to the difficulty of threshold setting and source enumeration.