Abstract
Background: In reality, time series is composed of several basic components, which
have linear, nonlinear and non-stationary characteristics at the same time. Directly using a single
model will show some limitations and the prediction accuracy is difficult to improve.
Methods: We propose a mixed forecasting model based on time series decomposition, namely
STL-EEMD-LSTM model. First, we use STL filtering algorithm to decompose the time series to
obtain the trend component, seasonal component and the remainder component of the time
series; then we use EEMD to decompose the seasonal component and the remainder component
to obtain multiple sub-sequences. After this, we reconstruct the new seasonal component and the
remainder component according to the fluctuation frequency of the sub-sequence. Finally, we
use LSTM to build a prediction model for each component obtained by decomposition.
Results: We applied the proposed model to simulation data and the time series of satellite
calibration parameters and found that the hybrid prediction model proposed in this paper has
high prediction accuracy.
Conclusion: Therefore, we believe that our proposed model is more suitable for the prediction of
time series with complex components.
Keywords:
STL, EEMD, LSTM, time series decomposition, time series forecasting, calibration parameter.
Graphical Abstract
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