基于相关原理的非整周期信号相位差测量算法

发布时间：2018-03-01 16:17

本文关键词： 相位差测量相关法非整周期采样自适应格型陷波器　出处：《仪器仪表学报》2014年09期 　论文类型：期刊论文

【摘要】：为提高相关法在非整周期采样情况下的相位差测量精度,提出一种基于相关原理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;然后利用滤波后的原2路同频信号产生具有90°相移的2个参考信号;将原2路同频信号分别与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得到相位差的计算公式。同时,针对引入两参考信号相移不是90°的情况,进行了误差分析并给出了相应的补偿措施。理论分析表明,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。仿真分析与工程应用均证实了该算法的有效性和可行性。
[Abstract]:In order to improve the accuracy of phase difference measurement by correlation method in the case of non-integral periodic sampling, a phase difference measurement algorithm based on correlation principle is proposed. Firstly, adaptive lattice notch filter is used to calculate the signal frequency. Then, two reference signals with 90 掳phase shift are generated by using the filtered original two channels of the same frequency signal, and the original two channels of the same frequency signal are respectively correlated with the two channels reference signal. Then, by using some properties of correlation and sinusoidal function, the calculation formula of phase difference is obtained. At the same time, the error is analyzed and the corresponding compensation measures are given in the case of introducing two reference signal phase shift is not 90 掳. The measurement accuracy of this algorithm is not affected by whether the sampling period is integral or not, and it can realize the dynamic detection of phase difference. Compared with the traditional algorithm, this algorithm has higher accuracy. The effectiveness and feasibility of the algorithm are verified by simulation and engineering application.
【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,2013jcyjA40030)资助项目
【分类号】：TN911.7

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