Satellite Clock Offset Determination and Prediction with Integrating Regional Satellite-Ground and Inter-Satellite Data

Time synchronization between Satellites is the foundation for satellite navigation system, which is realized by satellite-ground clock offset determination and prediction. Therefore, satellite clock offset determination and prediction is a key technique for satellite navigation systems. At present, precise time synchronization between satellites by inter-satellite link and auto-time synchronization is considered to be important development direction for navigation domain. A satellite clock offset determination and prediction method by integrating regional satellite-ground observation data and inter-satellite observation data is discussed. We first introduce some common used methods for satellite clock determination, and then discuss the principle and data process model for satellite clock determination based on inter-satellite link dada. We provide the method of Helmert variance components estimation to determine and predict satellite clock based on integrating satellite-ground and inter-satellite observation data. At last, we analyse the performance for our method by using real observation data and simulation data, the result shows the method overcomes the defects of regional monitoring network and improves the precise of prediction form 8 to 1.5 ns for MEO satellite when the satellites can't been observed. The method also increases the satellite clock data when the satellites can be observed, which can improved the precise and reliability for determination and prediction satellite clock offset.