提出一种基于频域相位信息的频率估计算法,利用正弦信号傅里叶变换相位谱中相位与频率的关系实现对声表面波谐振器回波频率的估计,并采用自相关运算消除回波信号初相位对估计结果的影响。通过无线测试系统和仿真回波信号对该算法进行了验证,表明算法的频率估计精度不受激励信号频率变化的影响,并且在整个声表面波谐振器的谐振频率变化范围内都具有较高的精度和稳定性。
Abstract
A frequency estimation algorithm based on the phase information in the frequency domain was proposed, which estimated the echo frequency of surface acoustic wave resonator (SAWR)by using the relationship between frequency and phase in the Fourier transform phase spectrum of sinusoidal signal, and the autocorrelation operation was performed for eliminating the influence of the initial phase of echo signal on the estimation results. The algorithm was verified by wireless test system and simulation echo signal. It was shown that the frequency estimation accuracy of the algorithm is not affected by the frequency change of the excitation signal, and has high accuracy and stability in the whole variation range of resonance frequency of SAWR.
关键词
计量学 /
频率估计 /
相位谱 /
回波信号 /
自相关运算 /
声表面波谐振器
Key words
metrology /
frequency estimation /
phase spectrum /
echo signal /
autocorrelation operation /
surface acoustic wave resonator
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基金
国家自然科学基金(51475240);航空科学基金(2014ZD52053);高速载运设施的无损检测和监控技术工信部重点实验室开放基金
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