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arXiv 1009.3418math.CAmath-phmath.MP
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变阶分数傅里叶变换相位恢复问题的唯一性结果

Uniqueness results for the phase retrieval problem of fractional Fourier transforms of variable order

Philippe Jaming

摘要:

本文研究了变阶分数傅里叶变换(FrFT)相位恢复问题的唯一性。这个问题在光学和量子物理学中自然发生。更精确地说,我们证明了,如果$u$和$v$是这样的,分数傅里叶变换的顺序$α$有相同的模$|F_αu|=|F_αv|$的$α$的一些集合$τ$,那么$v$等于$u$到一个恒定的相位因子。集合$τ$取决于对$u$或对$u$和$v$两者的一些额外假设。这里考虑的情况是$u$,紧凑的支持,脉冲串,埃尔米特函数或线性组合的平移和高斯扩张的$v$。在最后一种情况下,集合$τ$甚至可以被简化为单个点(即,一个分数傅里叶变换可以满足问题中的唯一性)。

英文摘要:

In this paper, we investigate the uniqueness of the phase retrieval problem for the fractional Fourier transform (FrFT) of variable order. This problem occurs naturally in optics and quantum physics. More precisely, we show that if $u$ and $v$ are such that fractional Fourier transforms of order $α$ have same modulus $|F_αu|=|F_αv|$ for some set $τ$ of $α$'s, then $v$ is equal to $u$ up to a constant phase factor. The set $τ$ depends on some extra assumptions either on $u$ or on both $u$ and $v$. Cases considered here are $u$, $v$ of compact support, pulse trains, Hermite functions or linear combinations of translates and dilates of Gaussians. In this last case, the set $τ$ may even be reduced to a single point (i.e. one fractional Fourier transform may suffice for uniqueness in the problem).

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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