不同采样间隔的钟差数据对钟差预报的影响分析

摘要

在卫星导航定位系统中,星载原子钟的钟差预报在维持系统时间同步、满足实时精密单点定位的需求等方面具有重要的作用。目前,钟差预报主要研究的是预报模型,关于钟差数据对钟差预报结果影响的研究还很少。基于 IGS提供的30 s、5 min和15 min采样间隔的精密钟差数据,分析和研究在预报条件相同时,不同采样间隔的钟差数据对钟差预报效果的影响。以常用的灰色模型和二次多项式模型对不同类型的卫星钟差进行预报和分析,结果表明,相同预报条件下钟差数据的采样率对预报结果有影响,IGS的15 min采样间隔的精密钟差数据较另外两种采样间隔的精密钟差数据能得到更好的预报结果。%Satellite clock bias (SBC)prediction of the space-borne atomic clock has an important role in satellite navigation system,such as maintaining the system time synchronization and meeting the needs of real-time precise point positioning.At present,the main study of the satellite clock bias is mainly focus on prediction models,but the effect of the clock bias data on the clock bias prediction is seldom concerned.By using 30s,5min and 15min sampling intervals of precision clock bias products from IGS,the effect of clock bias prediction with GM(1 ,1 )model and QP model under different sampling rates of clock bias data is studied in this paper.The test results show that the different sampling intervals of clock bias data have effects on the prediction results,and moreover the 15min sampling interval of precision clock bias data from the IGS can get better prediction results than that of the other two sampling intervals.