基于相角判据的Rife算法的涡街信号处理方法  

Modified Rife frequency estimation algorithm based on phase criterion for vortex signal processing

作　　者：孙宏军[1] 徐冠群[1] 

机构地区：[1]天津大学电气与自动化工程学院天津市过程检测与控制重点实验室,天津300072

出　　处：《仪器仪表学报》2013年第12期2860-2866,共7页Chinese Journal of Scientific Instrument

摘　　要：针对涡街信号频率估计中Rife算法在低信噪比、被估计频率接近量化频率时精度较差的问题,分析FFT结果幅值和相角的规律,提出了基于相角判据的Rife算法。对多种噪声环境下的涡街信号以及信号模型进行仿真,结果表明新的判据减小了方向判断错误比例、减小了平均误差,整体性能优于原始Rife算法。处理了实际涡街信号,表明其结果具有较好的一致性。新的相角判据为提高频率估计精度提供了一种新的思路,并且算法简单易于硬件实现。Aiming at the problem of low accuracy of Rife algorithm in the signal frequency estimation of vortex flowmeter at low signal noise ratio （SNR） and when the estimated frequency is close to the discrete frequency of fast Fourier transform （FFT） , a new Rife algorithm based on phase criterion is proposed based on the research results of the amplitude and phase of FFT. The vortex signal and signal model under various noise environment were simulated ; and simulation results show that the new method decreases the error ratio in direction judgment and the mean absolute error （MAE） ; and the overall performance of the method is better than that of original Rife algorithm. The actual vor- tex signal was processed with the new method,which shows that the result has good consisten rion provides a new idea for improving the frequency estimation precision, and the proposed easy to be implemented with hardware. cy. The new phase crite- algorithm is simple and

关 键 词：涡街流量计 频率估计 快速傅里叶变换 改进Rife算法 

分 类 号：TH814[机械工程—仪器科学与技术] TM93[机械工程—精密仪器及机械]