However, the HHT adaptively takes advantage of the local information of a signal at a certain time to obtain the instantaneous frequency of the signal at that time.
但为了获得信号某一时刻的瞬时频率值，HHT自适应地利用了信号在该时刻的局部信息。
参考来源 - 希尔伯特—黄变换局瞬信号分析理论的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
A method for identifying the instantaneous frequency of a linear time-varying structure was proposed.
提出了一种识别线性时变结构瞬时频率的方法。
All the conventional vibrators use the sweep signal of which the instantaneous frequency shows linear change with time.
常规可控震源都是采用瞬时频率随时间线性变化的扫描信号。
Supposing the LFM signals had been sorted and selecting the instantaneous frequency as identification character, the closest method is used to distinguish the signals.
在对LF M信号实现分选的基础上，选取待识信号的瞬时频率作为识别特征，利用最近邻方法对信号进行识别。
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