基于多次互相关的非整周期信号相位差测量算法

发布时间：2018-05-31 05:55

本文选题：相位差测量 + 相关法　；参考：《仪器仪表学报》2014年07期

【摘要】：针对工程实际中频率未知情况下存在相位差测量精度较差的问题,提出一种基于多次互相关的非整周期信号相位差测量算法:首先采用自适应格型陷波器进行滤波,以求信号频率;然后对滤波后的原2路增强信号分别进行希尔伯特变换,产生具有90鍊相移的2路相移信号;并利用估计出的信号频率产生具有90鍊相移的2路参考信号;将原2路增强信号和两路相移信号分别与2路参考信号进行相关运算,再利用相关和正弦函数的一些性质即可得到相位差的计算公式。实验结果表明,该算法测量精度不受采样是否整周期的影响,能实现相位差的动态检测;与传统算法相比,该算法测量精度更高,抗噪性能更强,更具鲁棒性和普适性。
[Abstract]:In view of the poor precision of phase difference measurement under the condition of unknown frequency in engineering practice, a phase difference measurement algorithm based on multiple cross-correlation is proposed. Firstly, adaptive lattice notch filter is used to filter the phase difference of non-integral periodic signal. In order to obtain the signal frequency, the original two enhanced signals after filtering are transformed into Hilbert transform to produce two phase shift signals with 90 phase shift, and two reference signals with 90 phase shift are generated by using the estimated signal frequency. The two channels enhancement signal and the two channel phase shift signal are correlated with the two reference signals respectively, and the formula of phase difference can be obtained by using some properties of correlation and sinusoidal function. The experimental results show that the measurement accuracy of this algorithm is not affected by whether the sampling period is integral or not, and the dynamic phase difference detection can be realized, and compared with the traditional algorithm, the algorithm has higher accuracy, stronger anti-noise performance, more robust and more universal.
【作者单位】：后勤工程学院信息工程系;
【基金】：国家自然科学基金(61271449,61302175) 重庆市自然科学基金(CSTC,2011BA2015;2013jcyjA40030)资助项目
【分类号】：TM933.312

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