考虑到GPS卫星的设计轨道具有明显的周期性,用三角函数多项式方法进行精密星历插值,并与经典的拉格朗日插值方法进行了比较。结果表明,无论是内插还是外推,三角函数多项式插值都比传统的朗格朗日插值精度高;并在分析精密星历误差对定位影响的基础上,指出利用三角函数多项式方法进行精密星历插值时,不需要将前一天和后一天的数据拼接在一起处理就能满足大部分定位要求。
On the basis of the periodicity of the designed orbit of GPS satellite, trigonometric function polynomial interpolation method is used to interpolate the IGS precise ephemeris. Besides, the accuracies of interpolation and extrapolation of trigonometric function polynomial interpolation are compared with classic Lagrange interpolation. The result indicates that the former can provide higher accuracy and is more stable.