海洋测绘2024，Vol.44Issue(1)：36-42,7.DOI:10.3969/j.issn.1671-3044.2024.01.008
基于坐标时间序列的地心运动分析与预测
Analysis and prediction of geocentric motion based on coordinate time series
摘要
Abstract
Geocentric motion affects the accuracy of the origin of the earth reference frame,which is one of the necessary factors that must be considered in the nonlinear maintenance of the terrestrial reference frame.Therefore,this paper proposes multi-scale modeling and prediction of geocentric motion to achieve the goal of establishing and maintaining a millimeter-scale terrestrial reference frame.The consistency and difference among the three groups of geocentric motion data calculated by the network shift approach,the Global Geophysical Fluid Center(GGFC)and the third reprocessing of the IGS(IGSR03)are analyzed.Then the harmonic model and Diff-LSTM model were proposed for the long-term and short-term modeling and prediction,respectively.The results showed that the prediction accuracy of the GGFC geocentric motion was better than 1.5 mm,while the prediction results of the Diff-LSTM model for geocentric motion were better than the harmonic model in the short term.The prediction accuracy of both GGFC and IGSR03 can be better than 1 mm when the predictive time length is 17,which indicates that the prediction accuracy of geocentric motion can fully meet the requirements for establishing and maintaining a center of mass-based instantaneous earth reference frame.关键词
地球参考框架/地心运动预测/坐标时间序列/谐波模型/Diff-LSTM模型Key words
terrestrial reference frame/geocentric motion prediction/coordinate time series/harmonic model/Diff-LSTM model分类
天文与地球科学引用本文复制引用
朱新慧,王刃,贾彦锋,柯能..基于坐标时间序列的地心运动分析与预测[J].海洋测绘,2024,44(1):36-42,7.基金项目
国家自然科学基金(41804018). （41804018）
