Prediction of Clock Bias for BeiDou Satellites Using a Combination of Variational Mode Decomposition and Long Short-Term Memory Network

分类： 物理学 >> 地球物理学、天文学和天体物理学 分类： 信息科学与系统科学 >> 信息科学与系统科学基础学科 提交时间： 2024-06-09

Wenlong Sun Fengfeng Shi Yuting Lin Jinfeng Xu Shaofeng He Yongxin Lin Guocheng Wang Run Zhao Pei Ma

摘要： The precise estimation of the satellite clock bias (SCB) holds considerable importance in ensuring accurate timekeeping, navigation, and positioning. This studyintroduces a novel SCB prediction approach that integrates variational mode decomposition (VMD) and long short-term memory (LSTM) network techniques, combining signal decomposition with deep learning methodologies. Initially, the raw SCB data undergoespreprocessing, followed by decomposition using the VMD method to generate multiple intrinsic mode functions (IMFs). These decomposed IMFs serve as inputs for LSTM, where several independent LSTM models are established for training and prediction purposes. Subsequently, the predicted outcomes are aggregated and reconstructed to derive the finalSCB prediction. Experimental findings demonstrate notable advancements in clock bias prediction for the spaceborne hydrogen atomic clock for BDS, with prediction accuracies of 0.048 ns, 0.204 ns and 1.397 ns for 6 hours, 3 days and 15 days, respectively. These results exhibit significant enhancements compared to both the LSTM network and the Back Propagation (BP) neural network, with improvements of 56%, 84% and 83% for the aforementioned time intervals in comparison to LSTM, and enhancements of 59%, 82% and 83% relative to the BP neural network.

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