Estimation of space-time clutter rank for subarrayed data
Estimation of space-time clutter rank for subarrayed data
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DOI：
10.1109/acssc.2004.1399138
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发表时间：
2004-11
期刊：
影响因子：
--
通讯作者：
L. Fertig
中科院分区：
文献类型：
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作者：
L. Fertig
本文给出了用空间子阵组合天线阵元时空时杂波协方差矩阵的秩次的新表达式。新的结果适用于相互重叠、相邻或在底层元素结构中有间隙分开的子阵列。仅假设底层单元结构是均匀的，并且子阵以相同的方式构造，具有均匀的间距。应当认识到，子阵列被分离的情况对应于规则间隔的子阵列的稀疏集合。提供了指示新表达式何时精确以及何时为上界的条件。杂波等级的新表达式精确的情况对应于新的场景系列(超出文献中所描述的那些)，其中，杂波等级由于空间混叠而“崩溃”。在新的表达式是上界的情况下，模拟表明新的表达式比以前发表的结果要紧得多。预计读者可以利用这些结果来选择系统参数，以最小化机载或星载雷达应用的杂波抑制结构的复杂性。
In this paper, a new expression is provided for the rank of the space-time clutter covariance matrix when spatial subarrays are employed to combine the antenna array elements. The new results are applicable to subarrays that are overlapped, adjacent to one another, or separated with a gap in the underlying element structure. It is only assumed that the underlying element structure is uniform and that the subarrays are constructed in an identical fashion with uniform spacing. It is recognized that the case in which the subarrays are separated corresponds to a regularly spaced "sparse" collection of subarrays. Conditions are provided to indicate when the new expression is exact and when it is an upper bound. The situations where the new expression for clutter rank is exact correspond to new families of scenarios (beyond those previously described in the literature) in which the clutter rank "collapses" due to spatial aliasing. In situations where the new expression is an upper bound, simulations have shown that the new expression is significantly tighter than previously published results. It is expected that the reader may utilize these results to select system parameters to minimize the complexity of the clutter mitigation structure, for airborne or spaceborne radar applications.