IGS精密卫星钟差插值算法的精度比较与分析  

Comparison and Analysis of the Precision of IGS Precise Satellite Clock Errors Interpolation Algorithm

作　　者：杨勇喜[1] 何秀凤[1] 王俊杰[1] 

机构地区：[1]河海大学卫星及空间信息应用研究所,江苏南京210098

出　　处：《地理空间信息》2014年第6期29-32,1-2,共4页Geospatial Information

基　　金：国家自然科学基金资助项目(41274017;41204002;41301449);江苏省科技支撑计划资助项目(BE2010316);江苏省普通高校研究生科研创新计划资助项目(CXZZ11_0451)

摘　　要：采用IGS提供的30 s、5 min和15 min间隔的精密卫星钟差产品,比较、分析了线性插值、拉格朗日插值、三次样条插值和两点三次埃尔米特插值等精密卫星钟差插值算法的精度。结果表明,线性插值精度最高,其余算法精度相当。拉格朗日插值存在奇偶性质,奇数阶插值比相邻偶数阶精度高,插值精度随阶数的增加有降低的趋势。钟差插值精度与卫星本身的钟差抖动程度有关,钟差抖动越大,精度越低。使用间隔较小的钟差产品插值精度更高。Using 30 s, 5 min and 15 min interval precise satellite clock products which are provided by IGS, this paper compared and analyzed the precisions of the linear interpolation, Lagrange interpolation, cubic spline interpolation and two cubic Hermite interpolations for satellite clock errors Interpolation Algorithm. The results show that linear interpolation can obtain the highest precision and the rest of algorithms are nearly the same. Lagrange interpolation exists parity features, the adjacent odd-order interpolation have higher precision than even-order interpolation. The precision has a decreasing trend with the order's increasing. Interpolation precision is relative to satellite clock error jitter itself, the greater jitter clock errors, the lower the precision. The interpolation precision could be higher by using smaller interval clock products.

关 键 词：IGS 精密卫星钟差 线性插值 拉格朗日插值 钟差抖动 

分 类 号：P228.41[天文地球—大地测量学与测量工程]