基于噪声白化准则的自适应噪声抵消方法.pdfVIP

学兔兔 第31卷 第8期 仪 器 仪 表 学 报 Vo1．31 No．8 2010年8月 Chinese Journal of Scientific Instrument Aug．2010 基于噪声白化准则的自适应噪声抵消方法术 文 静 ，文玉梅 r，李 平 (1 重庆大学光电技术及系统教育部重点实验室 重庆 400030； 2 重庆大学光电工程学院 重庆 400030) 摘 要：提高泄漏检测信号的信噪比是提高管道泄漏检测定位性能的重要途径，针对泄漏检测定位的一f 程实际提出一种新的 噪声抑制方法，基于噪声白化准则的A适应噪声抵消方法。用噪声白化准则控制检测信号的线性预测，提取出与干扰噪声相 关、与泄漏信号不相关的信号作为白适应噪声抵消器的参考输入，这样能够有效抵消泄漏检测信号中自相关长度小于泄漏信号 白相关长度的干扰噪声。实验结果和实际应用表明，该方法能有效抑制泄漏检测信号中的干扰噪声。 关键词：噪声抑制；白适应噪声抵消；噪声白化准则；线性预测；泄漏检测 中图分类号：TN911．23 文献标识码：A 国家标准学科分类代码：510．4010 Adaptive noise cancellation method based on error whitening criterion Wen Jing 一，Wen Yumei 一，Li Ping ， ( The Key Laboratory for Opto—electronic Techm)logiesSystems of Ministry of Education，Chongqing University。 Chongqing 400030，China；2 College of Omo—electronic Engineering，Chongqing University，Chongqing 400030，China) Abstract：Enhancing the signal—to—noise ratio of leak detection signal is an important approach to improve the per— formance of leak detection and locationing．According to the engineering practice of pipe leak detection and locatio— ning，this paper proposes a new method to suppress the noise of leak detection signal，the adaptive noise cancellation method based on error whitening criterion．Controlling the linear prediction of leak detection signal with error whiten— ing criterion，we can obtain a signal that is uncorrelated with leak signal but correlated with noise．Using this signal as the reference input of the adaptive noise canceller，the noise with autoeorrelation length shorter than that of the leak detection signal can be cancelled effectively．Experiment results and prac