| Citation: | LI X S,LI C,SHEN Q,et al. HRG stability period prediction based on signal decomposition and classification modeling[J]. Journal of Beijing University of Aeronautics and Astronautics,2024,50(12):3729-3738 (in Chinese) doi: 10.13700/j.bh.1001-5965.2022.1016 |
In order to predict the output stability period of hemispherical resonator gyro (HRG) accurately, a stability period prediction method based on signal decomposition and classification modeling was proposed. The sample variation law is not obvious due to the characteristics of high reliability and long-term stability of HRG. To solve this problem, the complementary ensemble empirical mode decomposition (CEEMD) algorithm with the ability of a frequency microscope was used to decompose the output to obtain the signal components with different frequency scales. The augmented Dickey-Fuller (ADF) method was applied to test the stationarity of component signals. Auto regressive moving average model (ARMA) prediction model was established for stationary components, and the entropy-radial basis function (RBF) neural network model was established for non-stationary components. After time alignment, the component signals were reconstructed to obtain the gyro output prediction model. The gyro output stability standard was designed, and the stability period prediction flow based on output prediction was provided. The experimental results show that the average relative error of the combined model prediction is only 1.29%, which is one order of magnitude less than the error of the autoregressive integrated moving average model (ARIMA) and one time less than the error of the entropy-RBF network model, which verifies the effectiveness and high accuracy of signal decomposition and classification modeling methods. The gyro stability period is predicted based on the gyro prediction output, and the conclusion that the experimental gyro output stability period is 3.95 years is obtained, which is consistent with the practical application, indicating the feasibility of the proposed method.
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