Abstract According to the characteristics of stable single-phase flow, a phase difference measurement method based on the extended Kalman filter is proposed in this paper for use with Coriolis mass flowmeters. Firstly, the Mallat algorithm is applied to filter out interference signals. Then, the frequency and phase difference of the two reconstructed signals are detected through the extended Kalman filter. Compared with the sliding Goertzel algorithm or discrete time Fourier transform, the proposed method does not need to predict the signal frequency and avoids quadratic error. Simulations and experiments show that the proposed method has stronger anti-interference, higher measurement accuracy and lower relative error than the existing method based on the Hilbert transformation.

中文翻译：

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一种基于扩展卡尔曼滤波器的科里奥利质量流量计相位差测量方法

摘要 针对稳定单相流的特点，提出了一种基于扩展卡尔曼滤波器的相位差测量方法，用于科里奥利质量流量计。首先，应用Mallat算法滤除干扰信号。然后，通过扩展卡尔曼滤波器检测两个重构信号的频率和相位差。与滑动Goertzel算法或离散时间傅立叶变换相比，该方法不需要预测信号频率，避免了二次误差。仿真和实验表明，与现有的基于希尔伯特变换的方法相比，该方法具有更强的抗干扰性、更高的测量精度和更低的相对误差。