改进的精密卫星钟差预报法

Improved algorithm for prediction of precise satellite clock bias

为解决近实时GPS精密单点定位中精密钟差改正问题.在分析现有卫星钟差预报模型的优缺点基础上,将GM(1,1)循环模型拓展进行卫星钟差预报,并提出了一种改进的GM(1,1)-AR(p)钟差预报模型,利用IGS数据中心提供的5分钟标准数据进行短期预报,分析所提改进方法能达到的精度.研究结果表明:改进的卫星钟差预报方法能有效提高钟差预报精度,是可行的.

In order to correct the satellite clock bias used in near-real-time Precise Point Positioning,the GM(1,1)cycle model has been expanded for predicting satellite clock bias with the help of analyzing the advantages and disadvantages of the existing method for predicting satellite clock bias,and an improved method of prediction of precise satellite clock bias--GM(1,1) cycle-AR(p) model is presented in this paper.The 5 minutes interval standard clock bias data supplied by IGS data center is used for short-term satellite clock bias prediction,and the prediction precision of improved prediction model is analyzed.The results show that the new improved satellite clock bias prediction model can attain high prediction precision and this prediction model is feasible.