基于IGS精密星历的卫星坐标和钟差插值  

The Interpolation Methods for Satellite Coordinate and Clock Offset Based on IGS Precise Ephemeris

作　　者：宫厚诚[1] 李全海[1] 

机构地区：[1]同济大学测量与国土信息工程系,上海200092

出　　处：《全球定位系统》2009年第5期24-26,38,共4页Gnss World of China

摘　　要：分别使用拉格朗日插值、Neville插值、Newton插值三种方法,以IGS提供的精密星历和钟差为基础内插所需时刻的卫星坐标和钟差。通过实例分析比较三种方法的优缺点,三种方法都是插值点在节点中央时插值精度高,9阶以上插值即能满足精密定位要求。Nev-ille插值和Newton插值有很多相似的特性,方便灵活,将会得到广泛应用。The methods of Lagrange interpolation, Neville interpolation and Newton interpolation interpolation are introduced. We can get the satellite coordinate and clock offset based on the precise ephemeris provided by IGS. Then by analysis and comparisons of the result, we can get their Advantages and disadvantages. It is more precise when interpolation point is just in the central of the node points. Neville and Newton algorithm have a lot of similar characters. These two methods are simple and feasible and will be widely used.

关 键 词：精密星历 钟差 拉格朗日插值 Neville插值 Newton插值 

分 类 号：P207[天文地球—测绘科学与技术]