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| Echo Frequency Estimation of Surface Acoustic Wave Resonator Based on Phase Information in Frequency Domain |
| LI Ya-fei1,CHEN Zhi-jun1,2,ZHU Wei-jun3,HUANG Hong-wei1,XIONG Zhi-qiang1 |
1. College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
2. Key Laboratory of Non-destructive Testing and Monitoring of High-speed Transport Facilities of Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu 211106, China
3. CETC Deqing Huaying Electronics Co., Deqing, Zhejiang 313200, China |
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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.
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Received: 02 August 2019
Published: 29 June 2020
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2020, Vol. 41 
