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1·Firstly the estimation of instantaneous frequency is discussed.

首先是瞬时频率的估计问题。

2·The local energy and instantaneous frequency of the signal can be derived from the IMFs.

信号的局部能量和瞬时频率都可以从其本征模函数中推导出来。

3·Instantaneous frequency measurement (DIFM) receiver is one of important component part of EW system.

瞬时测频接收机是电子战系统的重要组成部分之一。

4·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。

5·Instantaneous Frequency Measurement (IFM) receivers are important for modern electronic reconnaissance systems.

瞬时测频接收机是现代电子侦察系统的重要组成部分。

6·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。

7·Introduction to the physical concept, classical definition and application scope of instantaneous frequency (IF) is given.

首先介绍了瞬时频率的物理概念、经典定义及其适用范围。

8·Experimental simulation yielded the relation of the partial mode's instantaneous frequency and vortex frequency without noise.

实验模拟，得到无噪音的部分模式的瞬时频率的关系和涡流频率。

9·It has the properties of high time-frequency resolution and energy concentration as well as tracking instantaneous frequency etc.

它具有很高的时频分辨率、能量集中性和跟踪瞬时频率等特性。

10·This paper proposed the theory of digital counting instantaneous frequency measurement and analyzed the error of frequency measurement.

文章介绍了一种用直接数字计数测量瞬时频率的原理，并进行了测频误差分析。