| 基于DDC的SAW回波信号频率提取方法 |
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| 引用本文： | 陈磊,周世圆.基于DDC的SAW回波信号频率提取方法[J].北京化工大学学报(自然科学版),2010,37(6):131-135. |
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| 作者姓名： | 陈磊 周世圆 |
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| 作者单位： | 1北京化工大学 信息科学与技术学院, 北京 100029; 2北京理工大学 机械与车辆工程学院, 北京 100081 |
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| 基金项目： | 中央高校基本科研业务费专项资金项目 |
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| 摘 要： | SAW测量中,所要处理的回波信号具有瞬时、中频、窄带的特点,传统的FFT频谱分析法的频率分辨力受信号采样长度的制约,无法满足SAW测量的精度要求。基于SAW谐振器工作原理及信号特点,采用数字下变频技术降低回波信号频率,并以曲线拟合的方法提取信号频率;通过对比不同的谐振频率提取方法的处理结果,进一步验证了该方法的有效性。
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| 关 键 词： | SAW回波信号 DDC 谐振频率提取 曲线拟合 |
| 收稿时间： | 2010-01-05 |
Frequency extraction of SAW echo signal on DDC |
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| CHEN Lei,ZHOU ShiYuan.Frequency extraction of SAW echo signal on DDC[J].Journal of Beijing University of Chemical Technology,2010,37(6):131-135. |
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| Authors: | CHEN Lei ZHOU ShiYuan |
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| Institution: | 1. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029;2. School of Mechanical and Vehicular Engineering, Beijing Institute Technology, Beijing 100081, China |
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| Abstract: | The echo signal in SAW sensing take on character with instantaneousness, intermediate frequency and narrowband. The frequency extraction by the tradition FFT analytical method is restricted with the signal sampling length, which can’t fit precision in SAW sensing. By analyzing the theory of SAW resonator and the character of echo signal, use digital down conversion（DDC） to decrease the frequency of echo signal. Then acquire the frequency by curve fitting. By comparison different method of frequency extraction, the effective of this method was validated. |
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| Keywords: | SAW echo signal processing DDC resonant frequency acquired curve fitting |
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