IGS精密星历内插及外推方法比较分析  

Comparative Analysis on Methods for IGS Precise Ephemeris Interpolation and Extrapolation

作　　者：刘翔[1] 时振伟[1] 

机构地区：[1]山东科技大学测绘科学与工程学院,山东青岛266590

出　　处：《全球定位系统》2013年第2期70-73,81,共5页Gnss World of China

摘　　要：GPS卫星轨道具有明显的周期性,且有自身运动的特点。运用三角函数多项式方法进行精密星历内插及外推,并与经典的Lagrange插值和Chebyshev多项式拟合方法进行比较。结果表明:三种方法内插精度相当,但基于三角函数多项式的插值方法顾及了卫星运动特点,却具有更优的星历外推能力。On the basis of the periodicity o f the orbit of GPS satellite and characteristicof satellite movement, trigonometric function polynomial interpolation method is used to interpolate the IGS precise ephemeris. Besides, the accuracies of interpolation and extrapolation of trigonometric function polynomial are compared with classic Lagrange interpolation and Chebyshev polynomial fitting. The result indicates that three methods had similar accuracies of interpolation and the trigonometric function polynomial can provide higher accuracy, and is more stable on extrapolation considering characteristic of satellite movement.

关 键 词：内插 外推 三角插值 

分 类 号：P228.4[天文地球—大地测量学与测量工程]