瞬时频率

基于分数阶Fourier变换的瞬时频率估计方法

A method of instantaneous frequency estimation based on fractional Fourier tansformation

二维谐波参量估计与Chirp信号瞬时频率的研究

Two Dimensional Harmonic Parameters Estimation and Instantaneous Frequency Analysis of Chirp Signal

一种基于DSP的小波包变换对瞬时频率的测量

Measurement of Frequency by Wavelet Packet Transform Base on DSP

基于二进小波变换的实信号的多尺度Hilbert变换和瞬时频率提取

Dyadic wavelet transform based real signal multiscale Hilbert transform and extraction of instantaneous frequency

通过瞬时频率和进一步得到的Hilbert边际谱，对故障暂态信号进行了分析。

Thus fault transient signal can be analyzed by Instantaneous frequency and Hilbert marginal spectrum .

研究了单分量LFM信号的瞬时频率估计问题。

The instantaneous frequency estimation problems of single-component LFM signal are studied .

二维EMD的纹理分析及图像瞬时频率估计

Bidimensional EMD for Texture Analysis and Estimation of the Instantaneous Frequencies of an Image

对分离出的单分量谐波信号进行Hilbert变换，可以得到各次谐波的瞬时频率和瞬时幅值，即可以得到真正意义上的时频分布。

Accurate instantaneous frequency and instantaneous amplitude of harmonic components can be obtained by using Hilbert transform .

利用Hilbert变换对分段固有模态函数求解瞬时频率，可以获得以分段固有模态函数为基函数的信号表示形式，它是一般化的Fourier级数形式。

Using Hilbert transform to those sectional IMF components can obtain the presentation of signal that represents a generalized Fourier expansion .

基于瞬时频率细微特征分析的FSK信号个体识别

Individual identification of FSK signals based on fine feature analysis of instantaneous frequency

提出了基于瞬时频率拟合的三阶PPS信号参数估计估计方法。

A method based on instantaneous frequency fitting is proposed for the 3rd order PPS parameter estimation .

基于互Wigner-Ville分布的表面肌电信号瞬时频率估计

Instantaneous Frequency Estimation of the Surface Myoelectric Signal Wigner-Ville Distribution Based Technique

用相位差分和Wigner分布估计信号瞬时频率

Estimation of Instantaneous Frequency of a Signal Using the Phase Difference and the Wigner Distribution

相比傅立叶谱和小波谱，Hilbert谱对信号的瞬时频率和瞬时振幅都进行了确切的描述，具有更高的分辨率。

Hilbert spectrum gives precise description of instantaneous frequency and amplitude , embodies higher presentation compared with Fourier spectrum and Wavelet spectrum .

基于Hilbert变换的局域波法，能得到信号有意义的瞬时频率。

A meaningful instantaneous frequency for complicated signals can be obtained by the local wave decomposition method based on the Hilbert transform .

WVD瞬时频率无偏估计研究

Unbiased Estimation of Instantaneous Frequency Using the Discrete WVD

采用了G函数的方法来模拟跳频序列，然后利用短时傅立叶变换对它进行分析与瞬时频率的估计。

This paper uses the method of the function of G to imitate to the sequence of hopping-frequency , then makes use of short-time Fourier transform to carry on the analysis and instantaneous frequency estimation .

该文分析讨论了指数遗忘变换（EFT）的信号瞬时频率表示性能。

The analysis of exponentially forgetting transform ( EFT ) is made in this paper .

本征模式函数产生瞬时频率，最终结果表示为Hilbert谱规定的能量-频率-时间分布。

The intrinsic mode functions yield instantaneous frequencies . The final presentation of the results is an energy-frequency-time distribution , designated as the Hilbert spectrum .

这种方法最主要的概念创新是引入了基于信号局部特征的内在模式函数（IMF）的概念，从而使瞬时频率变得有实际意义；

In this method , the main conceptual innovations are the introduction of IMF based on local properties of the signal , which makes the instantaneous frequency meaningful ;

根据希尔伯特黄变换（HilbertHuangTransform），提出了基于瞬时频率估计的内燃机信号阶比分析方法，直接从振动信号的瞬时频率估计得到转速信号。

According to Hilbert-Huang transform , order analysis of the vibration signal based on the instantaneous frequency estimate ( IFE ) was proposed , which got rotating speed directly from IFE .

正是在这种情况下，重庆大学测试中心提出了基于瞬时频率估计（InstantaneousFrequencyEstimation&IFE）的阶比跟踪技术。

Just in such a case , Test Center of Chongqing University put forward an order-tracking technique on the basis of Instantaneous Frequency Estimation ( IFE ), and for the first time implemented order tracking without key-phasor .

应用WVD估计AM-FM信号的瞬时频率

Instantaneous frequency estimation for AM-FM signals based on WVD

提出了基于过零点和极点估计（zero-crossingandextremumestimation，ZCEE）求取幅度包络和瞬时频率的算法。

The zero-crossing and extremum estimation ( ZCEE ) algorithm was put forward to compute the amplitude envelope and instantaneous frequency .

该文对EFT的瞬时频率表示偏差、均方差值的统计特性与信噪比及遗忘系数的关系进行了分析，给出了相应的仿真结果。

The relationships of bias and mean square error of EFT with SNR and forgetting coefficient are studied .

基于LMD的信号瞬时频率求取方法及实验

Instantaneous frequency extraction method and experiment based LMD

在对LFM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。

Supposing the LFM signals had been sorted and selecting the instantaneous frequency as identification character , the closest method is used to distinguish the signals .

多分量信号瞬时频率可以利用TLSESPRIT结合数理统计的方法获得。

By using the method of the TLS ESPRIT combined with the mathematical statistics , the multi component signal 's IF can be obtained .

在现代化的电子战情况下，瞬时频率测量（IFM）是一项十分关键的技术。

In modern electronic warfare , instantaneous frequency measurement ( IFM ) is a crucial technology .

采用四阶经典龙格库塔（Runge-Kutta）算法，计算了不同注入信号强度和失谐频率下的激光输出功率、瞬时频率和增益系数。

The output power , instantaneous frequency and gain coefficient are calculated with the classic fourth order Runge-Kutta method for different input signal intensity and detuning frequency .