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arXiv 1107.4055math.NAcs.NA
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非切向流形上的交替投影

Alternating projections on non-tangential manifolds

Centre for Mathematical Sciences, Lund University(隆德大学数学中心)

Fredrik Andersson, Marcus Carlsson

AI总结:

研究在两个流形间交替投影生成的点序列的收敛性,证明序列收敛到交集中的点,且极限点与最优点的距离相对于初始距离有界,改进了先前结果,并给出频率估计的应用实例。

摘要:

我们考虑在两个流形 $\M_1$ 和 $\M_2$ 之间来回投影得到的点序列 $(B_k)_{k=0}^\infty$,并给出保证该序列收敛到极限 $B_\infty\in\M_1\cap\M_2$ 的条件。我们的动机是研究基于寻找此类序列极限的算法,这些算法已在多个领域证明有用。交集通常是一个具有理想性质的集合,但缺乏有效方法找到 $\M_1\cap\M_2$ 中最近点 $B_{opt}$。我们不仅证明了交替投影序列收敛,而且极限点相当接近 $B_{opt}$,其接近程度相对于距离 $\|B_0-B_{opt}\|$ 而言,从而显著改进了该领域的早期结果。还给出了一个应用于信号频率估计的具体例子。

英文摘要:

We consider sequences $(B_k)_{k=0}^\infty$ of points obtained by projecting back and forth between two manifolds $\M_1$ and $\M_2$, and give conditions guaranteeing that the sequence converge to a limit $B_\infty\in\M_1\cap\M_2$. Our motivation is the study of algorithms based on finding the limit of such sequences, which have proven useful in a number of areas. The intersection is typically a set with desirable properties, but for which there is no efficient method of finding the closest point $B_{opt}$ in $\M_1\cap\M_2$. We prove not only that the sequence of alternating projections converges, but that the limit point is fairly close to $B_{opt}$, in a manner relative to the distance $\|B_0-B_{opt}\|$, thereby significantly improving earlier results in the field. A concrete example with applications to frequency estimation of signals is also presented.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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