The effect of spatial averaging on spatial correlation matrices in the presence of coherent signals
The effect of spatial averaging on spatial correlation matrices in the presence of coherent signals
复制标题
存在相干信号时空间平均对空间相关矩阵的影响
DOI：
10.1109/29.56037
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
Don H. Johnson
中科院分区：
文献类型：
--
作者：
D. Linebarger;Don H. Johnson
考虑了两种类型的空间平均：子孔径平均和冗余平均。由于子孔径平均导致的相干性降低取决于源之间的距离：高度相干的，紧密间隔的源在子孔径平均后仍然保持高度相干。在有限平均情况下，这种剩余的高度相干性将阻止自适应测向方法（如MUSIC或EV）分辨这两个信号。相比之下，无论源间距如何，冗余平均都会大大降低信号间相干性，但可能会在源方位估计中引入偏差。>
Two types of spatial averaging are considered: subaperture averaging and redundancy averaging. The reduction of coherence due to subaperture averaging is shown to depend on the separation between the sources: highly coherent, closely spaced sources remain highly coherent after subaperture averaging. In finite averaging situations, this remaining high degree of coherence will prevent adaptive direction-finding methods such as MUSIC or EV from resolving the two signals. In contrast, redundancy averaging greatly reduces intersignal coherence regardless of source spacing, but bias may be introduced into the source bearing estimates. >