利用广播星历计算卫星的瞬时坐标

Calculation of GPS Satellite Coordinate by Making Use of Broadcast Ephemeris

为了提高GPS卫星轨道计算的精确性和实时性,通过对GPS卫星的广播星历进行分析,利用从广播星历中获取的开普勒轨道参数和轨道摄动修正项,以RINEX格式的广播星历为例,通过编程,计算卫星的轨道位置坐标,并将其与当天的精密星历所提供的卫星轨道位置坐标进行对比,并对广播星历的轨道精度进行初步的讨论。通过实例分析了利用广播星历的轨道参数、拉格朗日多项式插值这两种方法计算卫星任意时刻的坐标,并进行了精度比较。

To improve the accuracy and real-time of the GPS satellites orbits calculation, the Kepler parameters and orbital amendatory parameters obtained from the GPS broadcast ephemeris were analyzed. With the format of the RINEX broadcast ephemeris as an example, the coordinate of the GPS satellite the precise ephemeris supplied by IGS, and the accuracy of the orbit of pos the ition was calculated, the result compared with broadcast ephemeris discussed preliminarily In this paper calculates GPS satellite coordinates separately using orbit parameter of GPS broadcast ephemeris, Lagrange polynomial insert, and their calculation precisions are compared.