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MATLAB改进的自适应时频峰值滤波算法实现

时间:2018-03-17 21:55来源:毕业论文
介绍了时频分析研究背景的基础上,引出了短时傅立叶变换、Wigner-Ville分布等几种常用的时频分布的基本理论和性质。之后,本文着重介绍了时频峰值滤波。从对不同的信号能够实现窗

摘要时频峰值滤波是时频分析中处理非平稳信号的新出现方法。对于频谱时变的信号,传统的时域和频率域的分析方法都不能够全面地反映信号的特征,而时频分布形式则为非平稳信号的研究提供了有效的手段。本文主要研究了时频分析方法中的自适应时频峰值滤波算法及应用。
首先,本文在介绍了时频分析研究背景的基础上,引出了短时傅立叶变换、Wigner-Ville分布等几种常用的时频分布的基本理论和性质。之后,本文着重介绍了时频峰值滤波。从对不同的信号能够实现窗长的自适应考虑,介绍了窗长选择的改进方案,即基于滑动成对置信区间准则(SPICI)的自适应选择。基于上述分析,运用MATLAB仿真分析了该改进算法的性能。通过仿真分析得出,对于非平稳信号,该算法具有较好的性能,其去噪效果好,能有效降低均方差,具有广阔的应用前景。19793
关键词   时频分析  时频峰值滤波  自适应  SPICI  WVD 
毕业论文设计说明书(论文)外文摘要
Title Improved Adaptive Time-Frequency Peak Filtering algorithm                    
Abstract
Time-frequency peak filtering is a new method to solve non-stationary signals in time-frequency analysis. For the time varying signal , the tradition analysis methods like time domain or frequency domain can not fully reflect the characteristics of the signal, but the time-frequency distribution form provides an effective means to study the non-stationary signals . This paper studies the adaptive time-frequency peak filtering algorithms and applications in the time-frequency analysis. 源自L六^维:论`文~网-.加7位QQ3249`114 www.lwfree.cn
First,this paper based on the introduction of the time-frequence analysis, describes the basic theory of several commonly used time-frequence distributions ,like the short-time Fourier transform and the Wigner-Ville distribution.After that, this paper focuses on introducing time-frequency peak filtering.Considering to achieve adaptation of the window length when the signals are different,this paper describes the improvement of window length selections.It is based on the sliding pair-wise intersection
of confidence intervals(SPICI).Based on the above analysis, this paper uses MATLAB to analyze the performance of the improved algorithm. Through simulation results, for non-stationary signals, the algorithm has good performance because of its good denoising effects, and the reduction the mean square error.So it has broad application prospects.
Keywords  Time-frequency analysis  TFPF  adaptive  SPICI  WVD

 目 次
1 绪论    1
1.1  课题研究的背景和意义    1
1.2  国内外研究现状    2
1.3  本文研究的内容和组织安排    4
2  时频分析与时频峰值滤波    5
2.1  时频分析    5
2.2  Wigner-Ville分布    7
2.3  时频峰值滤波算法原理    13
2.4    本章小结    15
3  自适应时频峰值滤波算法原理及改进算法    16
3.1  自适应时频峰值滤波算法原理    16
3.2  自适应时频峰值滤波算法的实现    18
3.3  改进的自适应时频峰值滤波算法原理    20
3.4  本章小结    23
源自L六^维:论`文~网-.加7位QQ3249`114 www.lwfree.cn

4  算法实现及仿真实验    24
4.1  算法实现步骤    24
4.2  算法仿真实验    25
4.3  本章小结    32
5  全文总结和展望    33
5.1  全文总结    33 MATLAB改进的自适应时频峰值滤波算法实现:http://www.lwfree.cn/tongxin/20180317/11312.html
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