基于广播星历的卫星速度和加速度实时计算方法

摘要

Aiming at the problem that satellite speed and acceleration cannot be obtained in real time based on pre-cise ephemeris,which affects the timeliness of speed and acceleration of mobile vehicle,a new method is proposed to calculate the satellite velocity and acceleration based on broadcast ephemeris in real time.The limitations of the ex-isting satellite velocity programs is analyzed in this paper,and the formula of satellite velocity based on the matrix is deduced. The measured data are compared with the satellite speed and acceleration results calculated by broadcast ephemeris and precise ephemeris respectively. The results show thatthe error of satellite position obtained by broad-cast ephemeris is controlled with in 2 m,the velocity error is better than 1.4 mm per second,the acceleration error is better than 0.05 mm per second squared,and the real-time performance is good.%针对当前利用精密星历不能实现卫星速度和加速度实时获取,进而影响移动载体速度和加速度解算的时效性问题,提出一种基于广播星历实时计算卫星速度和加速度方法.分析现有广播星历求取卫星速度方案存在的局限性,推导基于矩阵形式的卫星运动速度求解公式,通过实测数据分别对广播星历和精密星历计算的卫星速度和加速度结果进行对比分析,结果表明:广播星历计算卫星位置误差在2 m以内,速度误差优于1.4 mm/s,加速度误差优于0.05 mm/s2,且具有良好的实时性.