Abstract We use the measured LOD values of EOP 14 C04 from 1984 to 2022 released by the International Earth Rotation and Reference Systems Service(IERS) for spectrum analysis and period item extraction. We then use the method of least square extrapolation model combined with polynomial curve model to apply the extracted period term to the fitting of LOD sequence. The experimental results show that, compared with the single LS extrapolation model fitting, the RMSE of the fitting sequence decreases from 0.000 3 seconds to 0.000 1 seconds. The deterministic coefficient is increased from 0.8 to 0.97 by the new method. These results can provide reference for the prediction of LOD sequence.
WEI Erhu,BAI Xiaoyu,LI Yanlin et al. Study on Time Series Analysis and Fitting of Diurnal Length Variationwith Observations from 1984 to 2022[J]. jgg, 2023, 43(4): 339-344.
WEI Erhu,BAI Xiaoyu,LI Yanlin et al. Study on Time Series Analysis and Fitting of Diurnal Length Variationwith Observations from 1984 to 2022[J]. jgg, 2023, 43(4): 339-344.
