非半周期采样信号相位差估计的相位校正相关法

发布时间：2018-07-02 22:17

本文选题：相位差估计 + 相位校正　；参考：《工程科学与技术》2017年04期

【摘要】：针对非半周期采样信号的相位差估计问题,提出一种非半周期采样信号相位差估计的相位校正相关法。首先,利用频率估计的相位匹配方法对采样信号进行频率估计,得到采样信号的频率估计值;其次,对采样信号进行互相关,得到互相关信号,并通过采样信号的信号时移和互相关构造一路新的互相关信号,使两路互相关信号具有相同的误差项;然后,利用两路互相关信号得到相位校正互相关信号;最后,利用相位校正互相关信号和频率估计值获得采样信号的相位差估计值。理论分析表明,该方法消除了采样信号非半周期采样对相位差估计的影响,无需预知信号幅值即可实现采样信号相位差的无偏估计。为验证所提方法的有效性和优越性,在不同相位差、信噪比和信号长度条件下对本文方法进行了仿真实验,并利用科氏流量计进行了应用实验。仿真实验结果表明,本文方法有效提高了非半周期采样信号的相位差估计精度,其相位差估计精度优于互相关方法、数据延拓式相关方法和正交时延估计方法的相位差估计精度,更接近克拉美罗下限。科氏流量计流量测量实验验证了本文方法在实际应用中的有效性。
[Abstract]:A phase correction correlation method for phase difference estimation of nonperiodic sampled signals is proposed. First, the frequency of the sampled signal is estimated by using the phase matching method of the frequency estimation, and the frequency estimation of the sampled signal is obtained. Secondly, the cross-correlation signal is obtained by cross-correlation of the sampled signal. A new cross-correlation signal is constructed by the time-shift and cross-correlation of the sampled signal, which makes the two cross-correlation signals have the same error term. Then, the phase correction cross-correlation signal is obtained by using the two cross-correlation signals. The phase difference estimation of the sampling signal is obtained by using the phase correction cross-correlation signal and the frequency estimation. Theoretical analysis shows that this method eliminates the influence of sampling signal non-semi-periodic sampling on phase difference estimation, and unbiased estimation of sampling signal phase difference can be realized without predicting the signal amplitude. In order to verify the effectiveness and superiority of the proposed method, simulation experiments are carried out under different phase differences, signal-to-noise ratio (SNR) and signal length conditions, and the application experiments are carried out by using Coriolis Flowmeter. The simulation results show that the proposed method can effectively improve the accuracy of phase difference estimation of non-periodic sampled signals, and the accuracy of phase difference estimation is better than that of cross-correlation method. The phase difference estimation accuracy of the data continuation correlation method and the orthogonal time delay estimation method is closer to the lower limit of Clemero. The flow measurement experiment of Coriolis Flowmeter verifies the effectiveness of this method in practical application.
【作者单位】：武警后勤学院军交运输系;后勤工程学院信息工程系;
【基金】：国家自然科学金资助项目(61601493) 武警部队应用项目资助(WHK15-8) 重庆市研究生科研创新项目资助(CYB14100)
【分类号】：TN911.23

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