Bulletin of Surveying and Mapping ›› 2026, Vol. 0 ›› Issue (3): 1-6.doi: 10.13474/j.cnki.11-2246.2026.0301

   

BeiDou satellite clock bias modeling and prediction method based on limited inter-satellite link measurement data

YE Chaofan1,2, BAI Yan1,2, ZHANG Xiaozhen1, ZHANG Feng3   

  1. 1. National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. China Xi'an Satellite Control Center, Xi'an 710043, China
  • Received:2025-08-20 Published:2026-04-08

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Abstract: BeiDou Navigation Satellite System (BDS) achieves autonomous orbit determination and time synchronization capabilities through inter-satellite link (ISL) technology,enabling the determination and predictive modeling of satellite clock biases using ISL measurements during autonomous operation.Addressing discontinuous and non-uniform data characteristics in BDS ISL measurements,this study proposes a hybrid modeling approach integrating a quadratic polynomial (QP) model with the Lomb-Scargle (LS) periodic correction algorithm to effectively decompose clock biases into trend,periodic,and stochastic components.Validations using BeiDou-3 ISL measurements demonstrate that the QP+LS fusion model significantly enhances prediction accuracy:3-hour predictions achieve an RMS better than 0.128 ns,and 24-hour predictions an RMS better than 0.442 ns,representing average improvements of 29.68% and 17.60% respectively over the conventional QP+FFT algorithm.These results provide critical technical references for clock bias prediction in BDS autonomous operations and clock modeling under constrained measurement data conditions.

Key words: clock bias modeling and prediction, inter-satellite link, time synchronization mechanism, hybrid model, Lomb-Scargle spectral analysis

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