首先是瞬时频率的估计问题。
Firstly the estimation of instantaneous frequency is discussed.
提出了一种识别线性时变结构瞬时频率的方法。
A method for identifying the instantaneous frequency of a linear time-varying structure was proposed.
首先介绍了瞬时频率的物理概念、经典定义及其适用范围。
Introduction to the physical concept, classical definition and application scope of instantaneous frequency (IF) is given.
研究瞬时频率的估计方法具有重要的理论意义和实用价值。
So the research about its methods to estimate will be valuable in theory and practice.
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。
All the conventional vibrators use the sweep signal of which the instantaneous frequency shows linear change with time.
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。
The local energy and instantaneous frequency of the signal can be derived from the IMFs.
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。
It has the properties of high time-frequency resolution and energy concentration as well as tracking instantaneous frequency etc.
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。
Experimental simulation yielded the relation of the partial mode's instantaneous frequency and vortex frequency without noise.
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。
This paper proposed the theory of digital counting instantaneous frequency measurement and analyzed the error of frequency measurement.
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.
该方法源于瞬时频率的概念，它能把动态信号的局部特征正确地在时频域内予以描述。
It stems from the concept of instantaneous frequency, and it can describe accurately the local properties of dynamic data in the time-frequency plane.
该文研究了应用WVD谱峰检测估计AM - FM信号的瞬时频率的方法及其性能。
In the paper, the method to estimate instantaneous frequency of AM-FM signals using the peak of the WVD and its performances are studied.
微波干涉仪混频输出的多普勒信号是一个非平稳信号，其瞬时频率随着时间的变化而变化。
The doppler signal that is mixed and exported by microwave interferometer is a non-stationary signal, its instantaneous frequency is changing time variant.
介绍了瞬时频率的概念和瞬态谱的小波包计算方法，并结合时间域模拟信号给出了其时频分布。
The conception of transient frequency and calculation method of wavelet packet are introduced, and time frequency distribution about simulation and actual seismic signals is given.
分析了瞬时频率的物理概念，指出在红外扫描系统中，用瞬时频率来计算系统带宽是值得讨论的。
The physical meaning of instantaneous frequency is analyzed. Its application in the evaluation of the bandwidth of IR scanning systems is discussed.
如果把瞬时频率作适当的非线性变化，就可以得到一个以地层衰减率的倒数的平均值为输入的频谱。
If a proper non - linear change of the instantaneous frequency is realized, we can get a frequency spectrum whose input is the mean of the reciprocals of bed attenuation coefficients.
分析了小波脊线与信号瞬时频率的关系，提出了基于小波脊线的刮水器电动机机械特性测试新方法。
The relationship between wavelet ridge and instantaneous frequency is analyzed and a new method of the mechanical characteristic test of the wiper motor based on wavelet ridge algorithm is proposed.
它的自适应性和局域性能很好的表征信号的瞬时频率和幅度，从而将信号表示成具有实际物理意义的形式。
Its adaptability and good local performance of signal instantaneous frequency and amplitude, thus make the signal expressed as a real physical form.
宽带雷达对抗侦察数字接收机具有较宽的瞬时频率覆盖特性和较高的截获概率，并能处理同时到达的多个信号。
Wide frequency spectrum can be received and high probability of intercepting can be got and the simultaneously attend signals can be processed by wide band radar EW reconnaissance digital receiver.
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。
Supposing the LFM signals had been sorted and selecting the instantaneous frequency as identification character, the closest method is used to distinguish the signals.
提出了一种基于综合相量幅值和相位变化规律实时测量电力系统振荡中振荡频率及瞬时频率的算法，利用三相电流经相应变换获得综合相量。
An algorithm based on the magnitude and phase Angle of the generalized phasor to measure instantaneous frequency and swing frequency while the power swing occurred is presented.
局域波分析方法的重大突破在于用基于信号局部特征的多个基本模式分量来描述信号，并赋予每个基本模式分量具有实际物理意义的瞬时频率。
The main innovations embodied in this method are the introduction of the intrinsic mode functions based on local properties of signals, which make the instantaneous frequency meaningful.
建议了一种基于复解析小波变换的瞬时频率分析齿轮故障振动信号的方法。 该方法将希尔伯特变换与小波变换相结合，具有自适应分析能力。
A method using transient frequency based on complex-analytical- wavelet-transform, which combines Hilbert transform with wavelet transform and possesses adaptive analytical ability, is proposed.
通过对信号进行基于瞬时自相关的瞬时频率提取的方法对中频信号进行分析、识别，然后可以在FP - GA内部构造一个多通道匹配滤波器对信号进行匹配。
The article analyses the signal through the method of gaining instant frequency on the base of instant correlation, then we can make up a multicenter matching filter in the FPGA.
经程序运算得到每个脉冲周期的采样点数，瞬时脉冲频率和周期。
Sampling point number of every pulse cycle, instantaneous pulse frequency and period was gained with program operation.
提出了在强噪声背景下检测瞬时信号的到达时间和频率成分的方法。
Then proposes a method to detect the arrival time of instantaneous signal and the frequency composition under strong noise background.
在单位功率因数整流器中，利用瞬时值比较法来控制电源电流，不但控制简单，还可有效限制器件的最高开关频率。
The method of instantaneous value comparison for source current control of unity power factor rectifier possesses advantages of simplicity as well as valid restriction for maximum switching frequency.
双线性时间-频率变换在时间域与频率域都具有较高的分辨率，有利于复杂背景条件下微弱瞬时信号的探测。
Bilinear time-frequency transform possesses a high resolution both in the time domain and the frequency domain. It can be utilized to detect weak transient signal in complex background.
指出了结构对地震动的频率具有选择性，结构的响应与瞬时能量谱之间具有密切的对应关系。
The feature that structures have the selectivity to the earthquake motions frequency and structure response has the close corresponding relation with instantaneous energy spectrum is pointed out.
在变速参数中影响电机瞬时电流波动最为显著的因素依次为变速波形、变速幅度和变速频率。
The significant factors which exert an influence on instantaneous fluctuation of motor current are in sequence :Vari-speed wave form, vari-speed amplitude and vari-speed frequency.
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