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Nonnegative time-frequency distributions for parametric time-frequency representations using semi-affine transformation group

机译:使用半仿射变换组的参数时频表示的非负时频分布

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摘要

This paper proposes a method for calculating a nonnegative time-frequency distribution (TFD) whose concentration is identical to that of Wigner-Ville distribution (WVD) when instantaneous frequencies (IFs) of the best-matched elementary functions of the signal under analysis are pre-estimated. This method is based on a special class of transformation group, referred to as semi-affine transformation (SAT) group. The essence of this method is to create a joint distribution by translating the values of WVDs of Morlet wavelet to the positions around IFs of the best-matched elementary functions. Theoretical predictions and numerical results indicate that the proposed strategy can result in the most visually appealing TFDs for highly nonstationary signals.
机译:本文提出了一种计算非负时频分布(TFD)的方法,当预先分析信号的最基本函数的瞬时频率(IFs)预先确定时,其浓度与Wigner-Ville分布(WVD)的浓度相同。 -估计。此方法基于一类特殊的变换组,称为半仿射变换(SAT)组。该方法的本质是通过将Morlet小波的WVD值转换为最匹配基本函数的IF周围的位置来创建联合分布。理论预测和数值结果表明,对于高度不稳定的信号,所提出的策略可以导致视觉上最吸引人的TFD。

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