| TDC超声流量计设计中的同频噪声处理 |
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| 引用本文： | 梁鸿翔,王润田,周艳.TDC超声流量计设计中的同频噪声处理[J].声学技术,2009,28(1):29-33. |
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| 作者姓名： | 梁鸿翔 王润田 周艳 |
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| 作者单位： | 中国科学院声学研究所东海研究站,上海,200032 |
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| 摘 要： | 介绍了一种基于TDC（Time—to—Digital Converter）传输延迟线法的时差法外夹式V型超声流量计的设计方法，分析了设计中存在的同频噪声的生成原因以及它对测量精度的影响；对同频噪声信号和待测信号进行建模，运用最大似然估计法对噪声的幅度、相位参数进行估计，给出同频噪声的消除算法；在同频噪声消除后，对待测信号的幅度、相他参数进行估计，利用估计结果给出TDC测时方法是否可用的判决函数，并给出TDC测时方法无法使用时的解决方案.
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| 关 键 词： | 最大似然估计 TDC 同频噪声 时差法 |
| 收稿时间： | 2008/6/13 0:00:00 |
| 修稿时间： | 2008/9/25 0:00:00 |
Suppression of similar frequency noise in the design of ultrasonic flow-meter with TDC |
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| LIANG Hong-xiang,WANG Run-tian and ZHOU Yan.Suppression of similar frequency noise in the design of ultrasonic flow-meter with TDC[J].Technical Acoustics,2009,28(1):29-33. |
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| Authors: | LIANG Hong-xiang WANG Run-tian and ZHOU Yan |
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| Affiliation: | (Shanghai Acoustics Laboratory, Acoustics Institute, Chinese Academy of Sciences, Shanghai 200032, China) |
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| Abstract: | A method of designing ultrasonic flow-meter with TDCs is introduced and the similar frequency noise＇s influence on the precision of ultrasonic flow-meter is also analyzed. By modeling the noise and the signal and using maximum likelihood estimation method （MLE） the unknown phase and amplitude of the noise and the signal are estimated. Based on the estimation, a solution of suppressing similar frequency noise and an improved design method are presented. |
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| Keywords: | TDC |
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