脉冲星信号的模糊阈值小波降噪算法

阎迪; 许录平; 谢振华

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脉冲星信号的模糊阈值小波降噪算法

专题研究 | 更新时间：2025-12-08

- 脉冲星信号的模糊阈值小波降噪算法
- Wavelet Denoising Algorithm Based on Fuzzy Threshold for Pulsar Signal
- 西安交通大学学报 2007年41卷第10期页码：1193-1196
- 作者机构：
  
  西安电子科技大学电子工程学院,西安,710071
- 作者简介：
- 基金信息：
  
  : 2007-01-29. 作者简介: 阎迪(1983～),女,硕士生;许录平(联系人),男,教授,博士生导师. 基金项目: 国家自然科学基金资助项目(60472085)
- DOI：
  中图分类号： TN911
- 网络首发：2007-10-10，
  
  纸质出版：2007
- 稿件说明：
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阎迪, 许录平, 谢振华. 脉冲星信号的模糊阈值小波降噪算法[J]. 西安交通大学学报, 2007,41(10):1193-1196.

阎迪, 许录平, 谢振华. Wavelet Denoising Algorithm Based on Fuzzy Threshold for Pulsar Signal[J]. 2007, 41(10): 1193-1196.
阎迪, 许录平, 谢振华. 脉冲星信号的模糊阈值小波降噪算法[J]. 西安交通大学学报, 2007,41(10):1193-1196. DOI：

阎迪, 许录平, 谢振华. Wavelet Denoising Algorithm Based on Fuzzy Threshold for Pulsar Signal[J]. 2007, 41(10): 1193-1196. DOI：

摘要

为了提高脉冲星辐射脉冲信号的信噪比

提出了基于模糊阈值的小波降噪算法.该算法的核心思想为:引入模糊理论

通过建立隶属度函数

计算出每个采样点信号幅值的隶属度

再利用小波阈值消噪的方法设定门限来分析隶属度

将隶属度大于门限的采样值划归为信号

反之为噪声

从而达到压抑噪声、保留信号的目的.实验结果表明

与基于极大极小原理和Stein无偏似然原理的降噪方法相比

基于模糊阈值的小波降噪算法将脉冲信号的信噪比提高了大约5～6 dB

同时可以保留信号的细节.新算法为脉冲星信号处理与应用提供了一个行之有效的算法.

Abstract

In order to improve the signal-to-noise ratio(SNR)of the pulsar signal

a wavelet denoising algorithm based on fuzzy threshold is put forward. The core of the algorithm is as follows: firstly

the fuzzy theory is introduced

by formulating the membership functions

the membership grade of each sample is calculated

then the threshold is set up and the membership grade is analyzed by using the wavelet denoising method

the samples that are larger than the threshold are categorized to the signal

and the others to the noise so as to achieve the aim for suppressing the noise and retaining the signal. Simulation result shows that

compared to the two methods based on minimax theory and stein unbias similar estimate theory respectively

the SNR of the pulsar signal of the proposed algorithm is increased by 5 to 6 dB while keeping the details of it.

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Keywords

references

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