时变软阈值法在纳秒脉冲信号去噪中的应用
Application of time-variant soft threshold method in denoising nanosecond pulse signal
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摘要: 对工程上常用的几种小波进行了分析，通过比较选定双正交小波为纳秒脉冲信号分析的母波，根据纳秒脉冲放电时产生的电磁干扰的特点提出基于多尺度分析的时变软阈值法，并对纳秒脉冲信号进行去噪处理。用Matlab自带的doppler波形和方波发生器产生的上升沿小于1 ns的方波对此方法进行检验，结果表明时变软阈值法明显优于传统的固定软阈值法。
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关键词:
- 脉冲功率 /
- 信号去噪 /
- 小波变换 /
- 固定阈值法时变软阈值法
Abstract: Based on the comparison of several commonly used wavelets in the engineering, biorthogonal wavelet is considered to be the most suitable mother wavelet for the nanosecond pulse analysis. A time variant soft threshold is proposed in the signal denoising on the basis of the characteristic of the noise. A Doppler wave in Matlab and a square pulse generated by square wave generator are chosen to validate the effect of the method. The results prove that the time-variant soft threshold method proposed in this paper is better than the traditionally used threshold-fixed method.-
Key words:
- pulse power /
- signal denoise /
- wavelet transform /
- threshold-fixed method
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