GPS导航卫星精密钟差的插值和预报方法研究

Research on Interpolation and Forecasting Method of GPS Precise Clock Bias

利用多种插值方法对GPS导航卫星钟差进行插值,通过与IGS（international GPS service）发布的事后精密钟差作比较,分析插值方法的特点与适用性;利用线性模型（linear model,LM）、二次多项式模型（polynomial model,PM）、灰色模型GM（1,1）对精密钟差进行预报,与IGS最终精密钟差相比可达到ns级精度,并分析了基础数据和预报时长对预报效果的影响。

This paper analyses the characteristicsof interpolation methodsand probes itsapplicability byinterpolating clock bias of GPS navigation satelliteswith multiple interpolation methods and comparing and contrasting the post-issued by IGS.The linear model,quadratic polynomial model and Grey model（1,1）are also used to forecast precision clock biasand results show that these models can reach the ns level.The influence of basic data and forecasting time on forecasting effect is analyzed in theend.