四川大学学报（工程科学版）2017，Vol.49Issue(4)：145-150,6.DOI:10.15961/j.jsuese.201600163
非半周期采样信号相位差估计的相位校正相关法
Phase Correction Correlation-based Phase Difference Estimation Method for Non-half Period Sampled Signals
摘要
Abstract
Aiming at the problem of phase difference estimation for non-half period sampled signals,a phase correction correlation-based of phase difference estimation for non-half period sampled signals was proposed.Firstly,a phase match-based frequency estimation method was utilized to estimate the frequency of sampled signals.Secondly,cross-correlation signals were gained by cross-correlation of sampled signals and the new cross-correlation signals were constructed by shifting sampled signals and cross-correlation,which had the same error term with the original crosscorrelation signals.Thirdly,phase correction cross-correlation signals were gained by means of two cross-correlation signals.Finally,estimated phase difference was obtained by utilizing phase correction cross-correlation signals and estimated frequency.Theoretical analysis indicated that the proposed method had eliminated the influence of non-half period sampled signals on phase difference estimation,and achieved unbiased phase difference estimation without estimating signal amplitudes.To validate the effectiveness and superority of the proposed method,simulation on conditions of different phase differences,signal-to-noise ratios(SNRs),signal lengths was performed.Then,the application experiment was conducted by using Coriolis mass flowmeters.Simulation and experimental results demonstrated that the proposed method improved the estimation precision of phase difference.Its estimation performance was better than those of the cross-correlation method,the data extension-based correlation method and the quadrature delay estimator and its estimation errors were closer to CRLB by comparison.The measurement results of Coriolis mass flowmeters validated the effectiveness of the proposed method in practice.关键词
相位差估计/相位校正/非半周期采样信号/频率估计Key words
phase difference estimation/phase correction/non-half period sampled signals/frequency estimation分类
信息技术与安全科学引用本文复制引用
沈艳林,周利坤,李明,肖玮..非半周期采样信号相位差估计的相位校正相关法[J].四川大学学报（工程科学版）,2017,49(4):145-150,6.基金项目
国家自然科学金资助项目(61601493) （61601493）
武警部队应用项目资助(WHK15-8) （WHK15-8）
重庆市研究生科研创新项目资助(CYB14100) （CYB14100）
