摘要
考虑到对精密星历插值的重要意义,采用Langrange插值和Chebyshev插值对IGS提供的1d的精密星历进行插值,并对插值精度做了对比分析。结果表明,2种插值方法中间时段插值精度较高,但边缘时段的插值精度差;而且由于IGS提供的精密星历是每隔15 min或5 min的卫星坐标,不可避免的对某些时段进行了外推,这样一来外推时段处的精度就不能保证。针对这些问题,提出了对不同时段采用不同的阶次、不同的间隔进行卫星轨道插值的方法,实验证明这种处理方法可以使1 d任意时刻的插值精度达到mm级。
Considering of the importance of IGS precise ephemeris interpolation,the characteristics of Lagrange interpolation and Chebyshev interpolation using one day of IGS data were compared with each other.It was concluded from the results that there was not good enough for the edge of the interval and the extrapolation.To solve these problems,using difference of orders and interval on difference of period was put forward.
出处
《地理空间信息》
2012年第5期50-52,56,共4页
Geospatial Information
基金
国家自然科学基金资助项目(41071294)
广西自然科学基金资助项目(桂0640178)
