采用余弦调制滤波器组泄漏检信号处理研究

发布时间：2018-01-02 18:28

本文关键词：采用余弦调制滤波器组泄漏检信号处理研究　出处：《仪器仪表学报》2015年12期 　论文类型：期刊论文

【摘要】：供水管道泄漏检测定位中,定位的不确定度由检测信号的信噪比决定,抑制噪声干扰,提高信噪比,是提高泄漏检测定位精度的关键。在充分分析泄漏信号特征的基础上,提出将改进的余弦调制滤波器组用于泄漏检测信号的噪声抑制。该方法利用分析滤波器组将信号分解为若干个带宽相同的子带信号,然后选择有效子带,再通过综合滤波器组将有效子带信号合成。该方法是一种不需要泄漏信号和噪声先验知识的自适应信号处理方法,能够有效抑制噪声,由于余弦调制滤波器分解的特性,即使泄漏信号处于不同频率段时,噪声抑制效果基本相同,处理后信噪比较处理前平均提高8 d B左右。实际工程应用验证表明,该方法去噪处理后的定位结果优于现有各种噪声抑制/信号增强方法的结果。
[Abstract]:Water supply pipeline leak detection, uncertain positioning accuracy by signal-to-noise ratio, restrain noise and improve the signal-to-noise ratio, is the key to improve the detection precision of leak. Based on a full analysis of leakage signal characteristics, the cosine modulated filter for improving noise suppression of leak detection signal analysis of filter bank decomposes the signal into several equal bandwidth subband signal by using this method, and then select the effective subband synthesis filter, through effective subband signal synthesis. This method is a kind of leakage does not need a priori knowledge of signal and noise adaptive signal processing method can effectively suppress the noise, because the decomposition characteristics of cosine modulated filter, even if the leakage signal in different frequency band, noise suppression effect is basically the same, after processing the SNR before processing an average increase of 8 d B. The actual engineering application verification shows that the location results of the proposed method are better than the results of the existing noise suppression / signal enhancement methods.

【作者单位】：重庆大学光电工程学院;
【分类号】：TU991.61
【正文快照】： 1引言时延估计是目前管道泄漏定位中常用的方法[1-4],但是时延估计的不确定度由泄漏检测信号的信噪比决定,信噪比越低时延估计误差越大。供水管道泄漏检测定位中,泄漏检测信号中混有管道内外的多种噪声,严重影响了时延估计的精度。为了抑制噪声,提高泄漏检测信号信噪比,研究者

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