基于灰色系统模型的IGS精密钟差预报

钟差是精密单点定位中的重要误差源,IGS及其分析中心能够提供高精度卫星钟差改正信息,但其具有滞后性,一般要13d后才能获取。基于此,在讨论灰色系统建模的基础上,利用12d的IGS钟差文件进行GM(1,1)建模与预报,并将其结果与二次多项式的预报结果进行比较分析,同时对Rb钟和Cs钟的GM(1,1)模型预报效果进行讨论,得出一些有益的结论。

Prediction of IGS accurate clock error based on grey system model

Clock error is an important error source in precise point positioning ,for w hich IGS and its analysis center can provide satellite clock error correction information of high precision ,but it has hysteretic nature that will take 13 days to get the information generally .On the basis of discussing the grey system model ,using 12 days’ of IGS clock error file to model and predicting for GM (1 ,1) ,its results are compared with those of the quadratic polynomial ,as well as the Rb clocks and Cs clocks GM (1 ,1) model prediction effects are discussed .Some useful conclusions are drawn .