Virtues and vices of quartic time-frequency distributions
Virtues and vices of quartic time-frequency distributions
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DOI：
10.1109/78.863070
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发表时间：
2000-09
期刊：
影响因子：
--
通讯作者：
J. O'Neill;P. Flandrin
中科院分区：
文献类型：
--
作者：
J. O'Neill;P. Flandrin
我们给出了三种不同类型的四次(四阶)时频分布(TFD)的结果。首先，我们给出了关于先前介绍的局部模糊函数的新结果，并表明它提供了比Wigner分布更可靠的瞬时线性调频比估计。其次，我们引入了四次、移位协变的时频分布，并研究了局域化二次啁啾的分布。最后，我们给出了时间和线性调频比的移位协变分布。
We present results concerning three different types of quartic (fourth order) time-frequency distributions (TFDs). First, we present new results on the previously introduced local ambiguity function and show that it provides more reliable estimates of instantaneous chirp rate than the Wigner distribution. Second, we introduce the class of quartic, shift-covariant, time-frequency distributions and investigate distributions that localize quadratic chirps. Finally, we present a shift covariant distribution of time and chirp rate.