短时傅里叶变换

这种干扰机在数字信号处理器中对雷达信号进行短时傅里叶变换，测量雷达信号参数，然后根据干扰策略&距离波门拖引干扰，控制DDS产生干扰信号。

DSP of this jammer takes STFT of radar signal and gets the signal parameter . According to RGPO , it controls DDS to produce jamming signal .

全矢谱技术和短时傅里叶变换是实现该分析方法的关键技术。

The Vector Spectrum and STFT is the key technology to realize this analysis method .

一种基于短时傅里叶变换的OFDM时间同步方法

A Short-Time Fourier Transform Based Symbol Timing Approach for OFDM Systems

该文提出了一种基于短时傅里叶变换的OFDM符号同步方法。

A blind short-time Fourier transform based approach for symbol timing in OFDM systems is proposed .

短时傅里叶变换（short-timeFouriertransform，STFT）是一种常见的时频分析工具，窗函数的选择是其分析的前提。

Short-time Fourier transform is a useful tool in time-frequency analysis , and the choice of window function is the precondition for their analysis .

利用虚拟仪器的思想和短时傅里叶变换的理论，论述了基于PC的语图仪的设计原理，分析了不同参数选取对处理结果的影响，介绍了该语图仪的编程和实现方法。

By using the idea of Virtual Instrument ( VI ) and the Short Time Fourier Transform ( STFT ), design principle of the spectrogram is discussed , the affection between different parameters and programming realization are also analysed .

首先研究了短时傅里叶变换的理论与实现，然后对小波变换和Wigner分布进行了分析与研究。

The theory and implementation of the short-time Fourier transform are firstly discussed . Then , the wavelet transform and Wigner distribution analysis are analyzed .

对Wigner-Ville变换、短时傅里叶变换（STFT）和小波变换等时频分析方法进行了研究。

Three time-frequency analysis methods , including the Wigner-Ville transform , short time Fourier transform ( STFT ) and wavelet transform , are introduced .

首先使用短时傅里叶变换（STFT）做信号的时频谱图，并通过图像处理方法对谱图进行预处理；

Firstly , Short Time Fourier Transform ( STFT ) is used to derive the time-frequency spectrograph , which is pre-treated with image processing techniques .

通过与短时傅里叶变换和Wigner-Ville分布的对比，验证匹配追踪算法在时频表示方面的性能。

By contrast with the short time Fourier transform and Wigner-Ville distribution to verify the performance of the matching pursuit algorithm in terms of time-frequency representation .

介绍了利用电网信息进行隐藏故障监视的方法，分析了实现扰动记录的可行性，并评价了目前常用的扰动信号检测方法：短时傅里叶变换、小波变换、S变换和HHT变换等。

The methods of hidden failure monitoring using power system information are introduced , the feasibility of power system disturbance recording is analyzed and regular disturbance signal detection methods are evaluated .

针对传统短时傅里叶变换（STFT）对时变显著信号分辨率不高的缺点，提出了一种对窗函数加调频系数的改进算法，用VC程序予以实现；

According to the low resolution of significantly time-varying signal analyzed by conventional STFT ( Short Time Fourier Transform ), this paper introduces an improved algorithm that considers coefficient of frequency modulation into window function .

因此，傅里叶分析以及建立在其基础上的短时傅里叶变换、Wigner-Ville分布和小波变换等不能很好地分析非线性、非平稳信号的问题。

Therefore , Fourier analysis and such based on it : the short-time Fourier transform , Wigner-Ville distribution and wavelet transform analysis can not well analyse non-linear , non-stationary signal problem .

对于混凝土构件的高频地震数据，利用自编的MATLAB程序进行短时傅里叶变换，提取各时窗的主频，然后用SURFER绘制时间-频率等值线图。

We programmed a program with the MATLAB to process the high-frequency seismic data of concrete elements by the short-time Fourier transform and extract the master frequency of each window , and we draw a time-frequency isoanomaly line with SURFER .

短时傅里叶变换和拟Wigner分布是应用最广泛的两种时频分析工具，其窗函数的选择是其应用的前提，对此仍有待深入研究。

Short time Fourier transform and pseudo-Wigner distribution are two most useful tools in time-frequency analysis , the choice of window functions is the base for their applications , which require deep study .

通过对回波数据进行短时傅里叶变换或Gabor变换，得到不同时刻的高分辨瞬时多普勒谱，然后对观测数据段的不同时刻进行瞬时成像。

The high resolution instantaneous Doppler frequency of different time is obtained by processing the Radar echo data with short time Fourier transform or Gabor transform , then the instantaneous ISAR images of different time are obtained by computer experiment .

本文针对短时傅里叶变换时频分辨率低以及Wigner-Ville分布存在交叉项干扰的问题，深入研究基于匹配追踪的时频表示方法。

Because the time-frequency resolution of the short time Fourier transform is too low and there is cross-term interference in the Wigner-Ville distribution , this paper studies the time-frequency method based on matching pursuit algorithm .

在第三章中，详细的研究了傅里叶变换、短时傅里叶变换、Wigner-Ville分布和小波变换等几种典型的时频分析方法，分析了各种联合时频分析方法的优点和缺点。

In the third chapter , three typical joint time-frequency analysis methods were researched . Such as fast Fourier transform , Wavelet transform and Wigner-Ville distribution , then analyze the advantage and disadvantage of them .

接着，建立了人体目标穿过经过菲涅尔透镜阵列调制过的热释电红外传感器阵列的目标模型，并利用短时傅里叶变换（STFT）对仿真信号模型进行了预处理。

Secondly , we established the target model while human targets are walking through the Fresnel fiber array modulated pyroelectric infrared sensor array and preliminary processing of the simulated signal model using the short-time Fourier transform ( STFT ) .

比如傅里叶变换和短时傅里叶变换不适用于非平稳信号的分析，Winger-Ville分布分析心音信号时会产生严重的交叉干扰项等等。

Such as Fourier transform and short time Fourier transform is not suitable to non-stationary signal analysis , Winger-Ville distribution creates cross-interference terms and so on .

用短时傅里叶变换、Wigner-Ville分布及Choi-Williams分布计算了表面肌电信号的时频分布，用于信号频率内容随时间演化的可视化观察。

The time-frequency distribution of the surface myoelectric signal was computed by means of STF ^ Wigner-Ville distribution and Choi-Williams distribution . They are used for the visual inspection of the evolution of the frequency content of the signal .

重点研究了基于离散短时傅里叶变换解调2FSK信号的方法，分析了几种码元同步算法和码元判决算法。

Secondly , a DSTFT ( Discrete Short Time Fourier Transform ) - based demodulation method for the2FSK signal is studied and algorithms for symbol synchronization and symbol decision are analysed .

本文根据频率跟踪式干扰的基本原理，提出一种基于短时傅里叶变换（STFT）的高速跳频图案的识别与跟踪方案，并采用可编程芯片系统（SOPC）技术进行了硬件实现。

According to the basic theory of frequency track jamming , this paper proposes a scheme to identify and track high-speed frequency-hopping pattern based on Short Time Fourier Transform ( STFT ) theory . This scheme is realized by using System On Programmable Chip ( SOPC ) Technology .

根据短时傅里叶变换的滤波器组实现原理，研究了不同窗函数实现的50Hz带通滤波器，分析比较了它们用于提取电力系统高压输电线路故障信号基频分量的能力。

According to the principle of filter banks of short time Fourier transform , various 50 Hz band pass filters modulated with different windows are studied , and their performances in extracting fundamental components among corrupted fault signals in HV transmission lines are compared .

基于短时傅里叶变换的肌电信号识别方法

A Surface EMG Signal Identification Method Based on Short-time Fourier Transform

短时傅里叶变换在压气机气动失稳分析中的应用

Application of Short Time Fourier Transform to LP Compressor Aerodynamic Unstability Analysis

基于短时傅里叶变换的电压暂降扰动检测

Voltage Sag Disturbance Detection Based on Short Time Fourier Transform

基于短时傅里叶变换的干涉相位解缠方法

InSAR Phase Unwrapping Algorithm Based on Two-dimensional Windowed Fourier Transform

因而短时傅里叶变换在信号分析上还是存在着不可逾越的缺陷。

Just for mat short-time Fourier transformation has fatal shortage in signal analysis .

基于短时傅里叶变换的鱼雷自导信号参数实时估计及应用

Real-time Parameter Estimation of Torpedo Homing Signal Based on STFT and its Application